Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_remove (2)

From: syzbot
Date: Wed Jan 31 2024 - 05:17:56 EST

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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in blk_trace_setup

INFO: task syz-executor.4:5645 blocked for more than 143 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27776 pid:5645 tgid:5644 ppid:5439 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f142fa7cda9
RSP: 002b:00007f142f5ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f142fbabf80 RCX: 00007f142fa7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f142fac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f142fbabf80 R15: 00007ffe08407bc8
</TASK>
INFO: task syz-executor.4:5647 blocked for more than 143 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:28384 pid:5647 tgid:5644 ppid:5439 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
sg_ioctl_common drivers/scsi/sg.c:1126 [inline]
sg_ioctl+0x9ac/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f142fa7cda9
RSP: 002b:00007f142f5de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f142fbac050 RCX: 00007f142fa7cda9
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000003
RBP: 00007f142fac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f142fbac050 R15: 00007ffe08407bc8
</TASK>
INFO: task syz-executor.0:5655 blocked for more than 144 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:27776 pid:5655 tgid:5654 ppid:5433 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f6155a7cda9
RSP: 002b:00007f615670b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6155babf80 RCX: 00007f6155a7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f6155ac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6155babf80 R15: 00007ffcf00f40b8
</TASK>
INFO: task syz-executor.0:5656 blocked for more than 144 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:29536 pid:5656 tgid:5654 ppid:5433 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
sg_ioctl_common drivers/scsi/sg.c:1126 [inline]
sg_ioctl+0x9ac/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f6155a7cda9
RSP: 002b:00007f61555ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6155bac050 RCX: 00007f6155a7cda9
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000003
RBP: 00007f6155ac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f6155bac050 R15: 00007ffcf00f40b8
</TASK>
INFO: task syz-executor.3:5675 blocked for more than 145 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:27776 pid:5675 tgid:5674 ppid:5431 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ff9d207cda9
RSP: 002b:00007ff9d2d8d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff9d21abf80 RCX: 00007ff9d207cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007ff9d20c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff9d21abf80 R15: 00007ffce595a448
</TASK>
INFO: task syz-executor.3:5678 blocked for more than 146 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:29536 pid:5678 tgid:5674 ppid:5431 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
sg_ioctl_common drivers/scsi/sg.c:1126 [inline]
sg_ioctl+0x9ac/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ff9d207cda9
RSP: 002b:00007ff9d2d6c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff9d21ac050 RCX: 00007ff9d207cda9
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000003
RBP: 00007ff9d20c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff9d21ac050 R15: 00007ffce595a448
</TASK>
INFO: task syz-executor.5:5682 blocked for more than 146 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:27776 pid:5682 tgid:5681 ppid:5441 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f489387cda9
RSP: 002b:00007f48945760c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f48939abf80 RCX: 00007f489387cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f48938c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f48939abf80 R15: 00007fff7affaad8
</TASK>
INFO: task syz-executor.5:5684 blocked for more than 147 seconds.
Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:29536 pid:5684 tgid:5681 ppid:5441 flags:0x00000006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf12/0x5c00 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe9/0x270 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
sg_ioctl_common drivers/scsi/sg.c:1126 [inline]
sg_ioctl+0x9ac/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f489387cda9
RSP: 002b:00007f48945550c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f48939ac050 RCX: 00007f489387cda9
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000003
RBP: 00007f48938c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f48939ac050 R15: 00007fff7affaad8
</TASK>

Showing all locks held in the system:
2 locks held by kworker/u4:0/11:
3 locks held by kworker/1:1/27:
#0: ffff888013088d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90000a2fd80 ((work_completion)(&(&devlink->rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffffffff8d1b8438 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#2: ffffffff8d1b8438 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3ff/0x800 kernel/rcu/tree_exp.h:995
1 lock held by khungtaskd/29:
#0: ffffffff8d1acbe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8d1acbe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8d1acbe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
3 locks held by kworker/1:2/781:
#0: ffff8880293f9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90003b17d80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcf/0x14b0 net/ipv6/addrconf.c:4129
2 locks held by getty/4820:
#0: ffff88802daca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
5 locks held by kworker/u5:2/5069:
#0: ffff88806d9d5d38 ((wq_completion)hci11){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90003a77d80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffff888067ff5060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x170/0x410 net/bluetooth/hci_sync.c:305
#3: ffff888067ff4078 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x150/0xb50 net/bluetooth/hci_sync.c:5337
#4: ffffffff8ef238c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
#4: ffffffff8ef238c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289
3 locks held by kworker/1:4/5080:
#0: ffff888013088d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90003b37d80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:281
2 locks held by kworker/1:5/5081:
2 locks held by kworker/1:6/5082:
#0: ffff88801308a938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90003b57d80 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
4 locks held by kworker/u5:3/5435:
#0: ffff88802083c538 ((wq_completion)hci9){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90004d1fd80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffff888204551060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x170/0x410 net/bluetooth/hci_sync.c:305
#3: ffff888204550078 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x150/0xb50 net/bluetooth/hci_sync.c:5337
6 locks held by kworker/u5:4/5438:
#0: ffff88820592c538 ((wq_completion)hci10){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc90004d5fd80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffff888205929060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x170/0x410 net/bluetooth/hci_sync.c:305
#3: ffff888205928078 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x150/0xb50 net/bluetooth/hci_sync.c:5337
#4: ffffffff8ef238c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
#4: ffffffff8ef238c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289
#5: ffffffff8d1b8438 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#5: ffffffff8d1b8438 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3ff/0x800 kernel/rcu/tree_exp.h:995
3 locks held by kworker/0:6/5519:
#0: ffff8880293f9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
#1: ffffc900054b7d80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
#2: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcf/0x14b0 net/ipv6/addrconf.c:4129
3 locks held by syz-executor.1/5639:
1 lock held by syz-executor.4/5645:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.4/5647:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.0/5655:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.0/5656:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.3/5675:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.3/5678:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.5/5682:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.5/5684:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.2/5960:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.2/5961:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.1/5987:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.1/5988:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.4/5996:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.4/5998:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.0/6004:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.0/6005:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.3/6007:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.3/6008:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.5/6011:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.5/6012:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.2/6031:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.2/6032:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.1/6101:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.1/6102:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.4/6110:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.4/6111:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.0/6116:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.0/6117:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.3/6122:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.3/6123:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.5/6131:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.5/6132:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.2/6150:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.2/6151:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427
1 lock held by syz-executor.4/6165:
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xe00 net/core/rtnetlink.c:6612
7 locks held by syz-executor.0/6175:
#0: ffff888029680420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12f/0x250 fs/read_write.c:643
#1: ffff8881b7959888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x27d/0x500 fs/kernfs/file.c:325
#2: ffff88802036fe90 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a0/0x500 fs/kernfs/file.c:326
#3: ffffffff8e356208 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x183/0x730 drivers/net/netdevsim/bus.c:166
#4: ffff88806de8b0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
#4: ffff88806de8b0e8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5: ffff88808c6d7250 (&devlink->lock_key#23){+.+.}-{3:3}, at: nsim_drv_probe+0xd5/0x1490 drivers/net/netdevsim/dev.c:1534
#6: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: fib_seq_sum+0x30/0x2e0 net/core/fib_notifier.c:46
4 locks held by syz-executor.3/6180:
#0: ffff888029680420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12f/0x250 fs/read_write.c:643
#1: ffff888092264c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x27d/0x500 fs/kernfs/file.c:325
#2: ffff88802036c008 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a0/0x500 fs/kernfs/file.c:326
#3: ffffffff8e356208 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216
1 lock held by syz-executor.5/6194:
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xe00 net/core/rtnetlink.c:6612
1 lock held by syz-executor.2/6203:
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8ecc25a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xe00 net/core/rtnetlink.c:6612
1 lock held by syz-executor.1/6207:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:669
1 lock held by syz-executor.1/6208:
#0: ffff88801f454c60 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:427

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf87/0x1210 kernel/hung_task.c:379
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5645 Comm: syz-executor.4 Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:rcu_lockdep_current_cpu_online+0x24/0x140 kernel/rcu/tree.c:4269
Code: 00 00 00 0f 1f 00 f3 0f 1e fa 65 8b 15 0d 4a 93 7e 81 e2 00 00 f0 00 b8 01 00 00 00 75 0a 8b 15 66 88 ca 0d 85 d2 75 01 c3 55 <53> 65 ff 05 ec 49 93 7e e8 ef 00 1e 09 48 c7 c3 c0 db 03 00 83 f8
RSP: 0018:ffffc900055a75b0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 000000000005637c RCX: ffffffff81ea9084
RDX: 0000000000000001 RSI: ffffffff8b2fdb80 RDI: ffffffff8ca99a60
RBP: ffff88813fff9140 R08: 0000000000000007 R09: 000000000007ffff
R10: 000000000000000a R11: 0000000000000002 R12: ffff888014300000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f142f5ff6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffea2813f98 CR3: 000000005b0c1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
rcu_read_lock_held+0x23/0x40 kernel/rcu/update.c:349
lookup_page_ext mm/page_ext.c:240 [inline]
page_ext_get+0x132/0x310 mm/page_ext.c:509
__set_page_owner+0x2a/0x60 mm/page_owner.c:197
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
relay_alloc_buf kernel/relay.c:121 [inline]
relay_create_buf kernel/relay.c:162 [inline]
relay_open_buf.part.0+0x27d/0xba0 kernel/relay.c:384
relay_open_buf kernel/relay.c:536 [inline]
relay_open+0x641/0xab0 kernel/relay.c:517
do_blk_trace_setup+0x4ad/0xc80 kernel/trace/blktrace.c:612
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:652
blk_trace_setup+0x47/0x60 kernel/trace/blktrace.c:670
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f142fa7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f142f5ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f142fbabf80 RCX: 00007f142fa7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f142fac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f142fbabf80 R15: 00007ffe08407bc8
</TASK>

Tested on:

commit: 1bbb19b6 Merge tag 'erofs-for-6.8-rc3-fixes' of git://..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=106b00afe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=b168fa511db3ca08
dashboard link: https://syzkaller.appspot.com/bug?extid=2373f6be3e6de4f92562
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=13d4f940180000

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