[syzbot] INFO: task hung in hwrng_register (2)

From: syzbot
Date: Sat Jun 04 2022 - 05:33:31 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 032dcf09e2bf Merge tag 'gpio-fixes-for-v5.19-rc1' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126c9583f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=99f457384a4fea79
dashboard link: https://syzkaller.appspot.com/bug?extid=23fb83d1d9fb5e6c54b3
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+23fb83d1d9fb5e6c54b3@xxxxxxxxxxxxxxxxxxxxxxxxx

INFO: task kworker/1:13:6950 blocked for more than 143 seconds.
Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:13 state:D stack:20992 pid: 6950 ppid: 2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5116 [inline]
__schedule+0x957/0xec0 kernel/sched/core.c:6428
schedule+0xeb/0x1b0 kernel/sched/core.c:6500
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559
__mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
add_early_randomness drivers/char/hw_random/core.c:69 [inline]
hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599
chaoskey_probe+0x7f0/0xb10 drivers/usb/misc/chaoskey.c:205
usb_probe_interface+0x66e/0xb60 drivers/usb/core/driver.c:396
call_driver_probe+0x96/0x250
really_probe+0x220/0x940 drivers/base/dd.c:634
__driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:764
driver_probe_device+0x50/0x240 drivers/base/dd.c:794
__device_attach_driver+0x273/0x3d0 drivers/base/dd.c:917
bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
__device_attach+0x372/0x5a0 drivers/base/dd.c:989
bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
device_add+0xb20/0xf90 drivers/base/core.c:3417
usb_set_configuration+0x1a5f/0x20e0 drivers/usb/core/message.c:2170
usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238
usb_probe_device+0x131/0x260 drivers/usb/core/driver.c:293
call_driver_probe+0x96/0x250
really_probe+0x220/0x940 drivers/base/dd.c:634
__driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:764
driver_probe_device+0x50/0x240 drivers/base/dd.c:794
__device_attach_driver+0x273/0x3d0 drivers/base/dd.c:917
bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
__device_attach+0x372/0x5a0 drivers/base/dd.c:989
bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
device_add+0xb20/0xf90 drivers/base/core.c:3417
usb_new_device+0xbfc/0x18a0 drivers/usb/core/hub.c:2566
hub_port_connect+0x106b/0x2930 drivers/usb/core/hub.c:5363
hub_port_connect_change+0x619/0xbe0 drivers/usb/core/hub.c:5507
port_event+0xeb7/0x1390 drivers/usb/core/hub.c:5663
hub_event+0x5be/0xd70 drivers/usb/core/hub.c:5745
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
</TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
#0: ffffffff8cb1eee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
5 locks held by kworker/1:2/145:
#0: ffff8881450c4138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc900022efd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffff888147908190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#2: ffff888147908190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bf/0xd70 drivers/usb/core/hub.c:5691
#3: ffff8881479104f8 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3095 [inline]
#3: ffff8881479104f8 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0x4fc/0x2930 drivers/usb/core/hub.c:5259
#4: ffff888020563c68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect+0x524/0x2930 drivers/usb/core/hub.c:5260
1 lock held by hwrng/755:
#0: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0xec/0x470 drivers/char/hw_random/core.c:503
2 locks held by getty/3288:
#0: ffff88814a989098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc90002cd62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2124
1 lock held by syz-executor.1/3640:
#0: ffffffff8cb23fe0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#0: ffffffff8cb23fe0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x266/0x720 kernel/rcu/tree_exp.h:927
4 locks held by kworker/u4:13/4639:
#0: ffff888011dba938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc90007727d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffffffff8dbb2610 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc50 net/core/net_namespace.c:556
#3: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: tc_action_net_exit include/net/act_api.h:170 [inline]
#3: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: gate_exit_net+0x2c/0x100 net/sched/act_gate.c:674
5 locks held by kworker/u4:18/5118:
2 locks held by kworker/0:14/6022:
#0: ffff888011c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc90002e0fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
6 locks held by kworker/1:13/6950:
#0: ffff8881450c4138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc90006fcfd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffff888021270190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#2: ffff888021270190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bf/0xd70 drivers/usb/core/hub.c:5691
#3: ffff88801d7cb190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#3: ffff88801d7cb190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x5a0 drivers/base/dd.c:964
#4: ffff88801d7cd118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#4: ffff88801d7cd118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x5a0 drivers/base/dd.c:964
#5: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: add_early_randomness drivers/char/hw_random/core.c:69 [inline]
#5: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599
3 locks held by kworker/0:22/10696:
#0: ffff888011c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc90005ab7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
3 locks held by kworker/0:23/10697:
#0: ffff888011c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc90005acfd00 (fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffffffff8cb23ea8 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x620 kernel/rcu/tree.c:4105
3 locks held by udevd/10954:
#0: ffff88807a763c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_file_read_iter fs/kernfs/file.c:197 [inline]
#0: ffff88807a763c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_read_iter+0x19b/0x570 fs/kernfs/file.c:236
#1: ffff8880262fea00 (kn->active#86){++++}-{0:0}, at: kernfs_file_read_iter fs/kernfs/file.c:198 [inline]
#1: ffff8880262fea00 (kn->active#86){++++}-{0:0}, at: kernfs_fop_read_iter+0x1b3/0x570 fs/kernfs/file.c:236
#2: ffff88801d7cb190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:840 [inline]
#2: ffff88801d7cb190 (&dev->mutex){....}-{3:3}, at: read_descriptors+0x30/0x390 drivers/usb/core/sysfs.c:873
2 locks held by syz-executor.2/14161:
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x772/0xea0 net/core/rtnetlink.c:6086
#1: ffffffff8cb23fe0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#1: ffffffff8cb23fe0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x329/0x720 kernel/rcu/tree_exp.h:927
2 locks held by syz-executor.3/14154:
#0: ffff888023ad6ca8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid+0x27/0xa0 net/netfilter/nf_tables_api.c:9182
#1: ffffffff8cb23ea8 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x620 kernel/rcu/tree.c:4105
1 lock held by syz-executor.5/14163:
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x772/0xea0 net/core/rtnetlink.c:6086
1 lock held by syz-executor.0/14165:
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8dbbe768 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x772/0xea0 net/core/rtnetlink.c:6086

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xd18/0xd60 kernel/hung_task.c:378
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 14154 Comm: syz-executor.3 Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x84/0x2e0 mm/kasan/generic.c:189
Code: da 4d 89 d6 4d 29 ce 49 83 fe 10 7f 30 4d 85 f6 0f 84 8e 01 00 00 4c 89 cb 4c 29 d3 66 2e 0f 1f 84 00 00 00 00 00 41 80 39 00 <0f> 85 e7 01 00 00 49 ff c1 48 ff c3 75 ee e9 67 01 00 00 44 89 cd
RSP: 0018:ffffc900044470e0 EFLAGS: 00000046
RAX: 1ffff1100415f801 RBX: ffffffffffffffff RCX: ffffffff8167ca2a
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fd46fc0
RBP: 000000000001ffff R08: dffffc0000000000 R09: fffffbfff1fa8df8
R10: fffffbfff1fa8df9 R11: 1ffffffff1fa8df8 R12: 0000000000000000
R13: ffff888020afc5d0 R14: 0000000000000001 R15: ffff888020afbb00
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555a83888 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:71 [inline]
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
hlock_class kernel/locking/lockdep.c:227 [inline]
check_wait_context kernel/locking/lockdep.c:4727 [inline]
__lock_acquire+0x49a/0x1f80 kernel/locking/lockdep.c:5003
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5665
rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:269
rcu_read_lock include/linux/rcupdate.h:695 [inline]
folio_memcg_lock+0x8c/0x5f0 mm/memcontrol.c:2042
page_remove_rmap+0x2f/0x4c0 mm/rmap.c:1429
zap_pte_range+0x9d0/0x1e10 mm/memory.c:1446
zap_pmd_range+0x587/0x690 mm/memory.c:1567
zap_pud_range mm/memory.c:1596 [inline]
zap_p4d_range mm/memory.c:1617 [inline]
unmap_page_range+0x310/0x600 mm/memory.c:1638
unmap_vmas+0x227/0x3b0 mm/memory.c:1723
exit_mmap+0x1c5/0x530 mm/mmap.c:3162
__mmput+0x111/0x3a0 kernel/fork.c:1187
exit_mm+0x211/0x2f0 kernel/exit.c:510
do_exit+0x4ca/0x1ed0 kernel/exit.c:782
do_group_exit+0x23b/0x2f0 kernel/exit.c:925
get_signal+0x172f/0x1780 kernel/signal.c:2857
arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166
exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f82e5c89109
Code: Unable to access opcode bytes at RIP 0x7f82e5c890df.
RSP: 002b:00007f82e6dec168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000000b0 RBX: 00007f82e5d9bf60 RCX: 00007f82e5c89109
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f82e5ce308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffde4662fcf R14: 00007f82e6dec300 R15: 0000000000022000
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 4d 89 d6 mov %r10,%r14
3: 4d 29 ce sub %r9,%r14
6: 49 83 fe 10 cmp $0x10,%r14
a: 7f 30 jg 0x3c
c: 4d 85 f6 test %r14,%r14
f: 0f 84 8e 01 00 00 je 0x1a3
15: 4c 89 cb mov %r9,%rbx
18: 4c 29 d3 sub %r10,%rbx
1b: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
22: 00 00 00
25: 41 80 39 00 cmpb $0x0,(%r9)
* 29: 0f 85 e7 01 00 00 jne 0x216 <-- trapping instruction
2f: 49 ff c1 inc %r9
32: 48 ff c3 inc %rbx
35: 75 ee jne 0x25
37: e9 67 01 00 00 jmpq 0x1a3
3c: 44 89 cd mov %r9d,%ebp

---
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Next message: Hyeonggon Yoo: "Re: [PATCH v2] mm/slub: Simplify __kmem_cache_alias()"
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