Re: [syzbot] [net?] WARNING: suspicious RCU usage in dev_activate
From: syzbot
Date: Thu Sep 12 2024 - 15:19:37 EST
syzbot has found a reproducer for the following issue on:
HEAD commit: 77f587896757 Merge tag 'arm-fixes-6.11-3' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1781149f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=61d235cb8d15001c
dashboard link: https://syzkaller.appspot.com/bug?extid=2120b9a8f96b3fa90bad
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=128160a9980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3d43e4fb8f51/disk-77f58789.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3f2facb83939/vmlinux-77f58789.xz
kernel image: https://storage.googleapis.com/syzbot-assets/26e67580882c/bzImage-77f58789.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2120b9a8f96b3fa90bad@xxxxxxxxxxxxxxxxxxxxxxxxx
=============================
WARNING: suspicious RCU usage
6.11.0-rc7-syzkaller-00039-g77f587896757 #0 Not tainted
-----------------------------
net/sched/sch_generic.c:1250 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u8:4/62:
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2863
stack backtrace:
CPU: 1 UID: 0 PID: 62 Comm: kworker/u8:4 Not tainted 6.11.0-rc7-syzkaller-00039-g77f587896757 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bond0 bond_mii_monitor
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6724
dev_activate+0xf8/0x1240 net/sched/sch_generic.c:1250
linkwatch_do_dev+0xfb/0x170 net/core/link_watch.c:173
ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:799
bond_miimon_inspect drivers/net/bonding/bond_main.c:2643 [inline]
bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2865
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
=============================
WARNING: suspicious RCU usage
6.11.0-rc7-syzkaller-00039-g77f587896757 #0 Not tainted
-----------------------------
net/sched/sch_generic.c:1228 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u8:4/62:
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2863
stack backtrace:
CPU: 1 UID: 0 PID: 62 Comm: kworker/u8:4 Not tainted 6.11.0-rc7-syzkaller-00039-g77f587896757 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bond0 bond_mii_monitor
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6724
transition_one_qdisc+0x8e/0x1c0 net/sched/sch_generic.c:1228
netdev_for_each_tx_queue include/linux/netdevice.h:2513 [inline]
dev_activate+0x838/0x1240 net/sched/sch_generic.c:1258
linkwatch_do_dev+0xfb/0x170 net/core/link_watch.c:173
ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:799
bond_miimon_inspect drivers/net/bonding/bond_main.c:2643 [inline]
bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2865
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
=============================
WARNING: suspicious RCU usage
6.11.0-rc7-syzkaller-00039-g77f587896757 #0 Not tainted
-----------------------------
include/linux/rtnetlink.h:100 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u8:4/62:
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2863
stack backtrace:
CPU: 0 UID: 0 PID: 62 Comm: kworker/u8:4 Not tainted 6.11.0-rc7-syzkaller-00039-g77f587896757 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bond0 bond_mii_monitor
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6724
dev_ingress_queue include/linux/rtnetlink.h:100 [inline]
dev_activate+0x925/0x1240 net/sched/sch_generic.c:1259
linkwatch_do_dev+0xfb/0x170 net/core/link_watch.c:173
ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:799
bond_miimon_inspect drivers/net/bonding/bond_main.c:2643 [inline]
bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2865
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1525
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 62, name: kworker/u8:4
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
3 locks held by kworker/u8:4/62:
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2863
CPU: 0 UID: 0 PID: 62 Comm: kworker/u8:4 Not tainted 6.11.0-rc7-syzkaller-00039-g77f587896757 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bond0 bond_mii_monitor
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
__might_resched+0x5d4/0x780 kernel/sched/core.c:8463
down_read+0x8e/0xa40 kernel/locking/rwsem.c:1525
wireless_nlevent_flush net/wireless/wext-core.c:351 [inline]
wext_netdev_notifier_call+0x1f/0x120 net/wireless/wext-core.c:371
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
netdev_state_change+0x11f/0x1a0 net/core/dev.c:1376
linkwatch_do_dev+0x112/0x170 net/core/link_watch.c:177
ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:799
bond_miimon_inspect drivers/net/bonding/bond_main.c:2643 [inline]
bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2865
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
=============================
[ BUG: Invalid wait context ]
6.11.0-rc7-syzkaller-00039-g77f587896757 #0 Tainted: G W
-----------------------------
kworker/u8:4/62 is trying to lock:
ffffffff8fc7f690 (net_rwsem){++++}-{3:3}, at: wireless_nlevent_flush net/wireless/wext-core.c:351 [inline]
ffffffff8fc7f690 (net_rwsem){++++}-{3:3}, at: wext_netdev_notifier_call+0x1f/0x120 net/wireless/wext-core.c:371
other info that might help us debug this:
context-{4:4}
3 locks held by kworker/u8:4/62:
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888011c52948 ((wq_completion)bond0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015d7d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2863
stack backtrace:
CPU: 0 UID: 0 PID: 62 Comm: kworker/u8:4 Tainted: G W 6.11.0-rc7-syzkaller-00039-g77f587896757 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bond0 bond_mii_monitor
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_lock_invalid_wait_context kernel/locking/lockdep.c:4750 [inline]
check_wait_context kernel/locking/lockdep.c:4820 [inline]
__lock_acquire+0x153b/0x2040 kernel/locking/lockdep.c:5092
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
down_read+0xb1/0xa40 kernel/locking/rwsem.c:1526
wireless_nlevent_flush net/wireless/wext-core.c:351 [inline]
wext_netdev_notifier_call+0x1f/0x120 net/wireless/wext-core.c:371
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
netdev_state_change+0x11f/0x1a0 net/core/dev.c:1376
linkwatch_do_dev+0x112/0x170 net/core/link_watch.c:177
ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:799
bond_miimon_inspect drivers/net/bonding/bond_main.c:2643 [inline]
bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2865
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
---
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#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.