syzbot


INFO: task hung in rfkill_register

Status: auto-closed as invalid on 2022/02/05 14:58
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 367d, last: 354d

Sample crash report:
INFO: task kworker/0:4:1882 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4     state:D stack:25016 pid: 1882 ppid:     2 flags:0x00004000
Workqueue: events vhci_open_timeout
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 rfkill_register+0x36/0xb00 net/rfkill/core.c:1044
 hci_register_dev+0x385/0xc00 net/bluetooth/hci_core.c:2603
 __vhci_create_device+0x37e/0x7b0 drivers/bluetooth/hci_vhci.c:334
 vhci_create_device drivers/bluetooth/hci_vhci.c:372 [inline]
 vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:529
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/u5:4:6579 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:4    state:D stack:26888 pid: 6579 ppid:     2 flags:0x00004000
Workqueue: hci0 scan_update_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 hci_req_sync net/bluetooth/hci_request.c:209 [inline]
 scan_update_work+0x26/0xb0 net/bluetooth/hci_request.c:1911
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task systemd-rfkill:32681 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-rfkill  state:D stack:26000 pid:32681 ppid:     1 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x174/0x270 kernel/sched/completion.c:138
 __flush_work+0x56c/0xb10 kernel/workqueue.c:3104
 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3191
 hci_request_cancel_all+0x38/0x100 net/bluetooth/hci_request.c:2709
 hci_dev_close_sync+0xa1/0x1120 net/bluetooth/hci_sync.c:3971
 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553
 hci_rfkill_set_block+0x19c/0x1d0 net/bluetooth/hci_core.c:935
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:344
 rfkill_fop_write+0x41a/0x500 net/rfkill/core.c:1276
 vfs_write+0x28e/0xae0 fs/read_write.c:588
 ksys_write+0x1ee/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f55cd7091b0
RSP: 002b:00007ffd51d9fd38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055eb04a95040 RCX: 00007f55cd7091b0
RDX: 0000000000000008 RSI: 00007ffd51d9fd80 RDI: 0000000000000003
RBP: 00007ffd51d9fd78 R08: 000055eb04a9b1b0 R09: 0000000000001010
R10: 0000000000080000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd51d9fd70 R14: 0000000000000000 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb828a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
4 locks held by kworker/0:4/1882:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc9000637fdb0 ((work_completion)(&(&data->open_timeout)->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
 #2: ffff88806e5d9118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device drivers/bluetooth/hci_vhci.c:371 [inline]
 #2: ffff88806e5d9118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_open_timeout+0x2d/0x50 drivers/bluetooth/hci_vhci.c:529
 #3: ffffffff8d708f08 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x36/0xb00 net/rfkill/core.c:1044
2 locks held by in:imklog/6227:
 #0: ffff888072b18d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:994
 #1: ffff8880b9c39cd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:497 [inline]
 #1: ffff8880b9c39cd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x8c/0x120 kernel/sched/core.c:482
2 locks held by agetty/6232:
 #0: ffff88801d0f9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000206a2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077
3 locks held by kworker/u5:4/6579:
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888078274938 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc900029cfdb0 ((work_completion)(&hdev->scan_update)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
 #2: ffff888080745000 (&hdev->req_lock){+.+.}-{3:3}, at: hci_req_sync net/bluetooth/hci_request.c:209 [inline]
 #2: ffff888080745000 (&hdev->req_lock){+.+.}-{3:3}, at: scan_update_work+0x26/0xb0 net/bluetooth/hci_request.c:1911
2 locks held by systemd-rfkill/32681:
 #0: ffffffff8d708f08 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x500 net/rfkill/core.c:1260
 #1: ffff888080745000 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551
2 locks held by syz-executor.5/343:
 #0: ffffffff8c5eafe8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
 #1: ffffffff8d708f08 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x10d/0x720 net/rfkill/core.c:1148

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc4-next-20211207-syzkaller #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+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:413
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23318 Comm: kworker/u4:0 Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
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+0xde/0x180 mm/kasan/generic.c:189
Code: 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 <74> f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c 2c eb 0c
RSP: 0018:ffffc90000007ab0 EFLAGS: 00000046
RAX: ffffed100247a7d5 RBX: ffffed100247a7d6 RCX: ffffffff815436d1
RDX: ffffed100247a7d6 RSI: 0000000000000008 RDI: ffff8880123d3ea8
RBP: ffffed100247a7d5 R08: 0000000000000000 R09: ffff8880123d3eaf
R10: ffffed100247a7d5 R11: 0000000000000000 R12: ffff888010e1c000
R13: 0000000000000001 R14: ffff8880123d3ea8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f040ea77000 CR3: 000000000b88e000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 cpumask_test_cpu include/linux/cpumask.h:379 [inline]
 select_idle_smt kernel/sched/fair.c:6200 [inline]
 select_idle_sibling kernel/sched/fair.c:6446 [inline]
 select_task_rq_fair+0x25f1/0x3b50 kernel/sched/fair.c:6929
 select_task_rq kernel/sched/core.c:3430 [inline]
 try_to_wake_up+0x38b/0x1510 kernel/sched/core.c:4115
 wake_up_worker kernel/workqueue.c:856 [inline]
 insert_work+0x2a0/0x370 kernel/workqueue.c:1388
 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1539
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1461 [inline]
 __run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5605
Code: 9e a5 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000328fba0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000651f76 RCX: 8103149850bc02f9
RDX: 1ffff1100236c4f4 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ff94947
R10: fffffbfff1ff2928 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8bb828a0 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
 rcu_read_lock include/linux/rcupdate.h:694 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:723
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 f2                	je     0xfffffff4
   2:	48 89 c2             	mov    %rax,%rdx
   5:	b8 01 00 00 00       	mov    $0x1,%eax
   a:	48 85 d2             	test   %rdx,%rdx
   d:	75 56                	jne    0x65
   f:	5b                   	pop    %rbx
  10:	5d                   	pop    %rbp
  11:	41 5c                	pop    %r12
  13:	c3                   	retq
  14:	48 85 d2             	test   %rdx,%rdx
  17:	74 5e                	je     0x77
  19:	48 01 ea             	add    %rbp,%rdx
  1c:	eb 09                	jmp    0x27
  1e:	48 83 c0 01          	add    $0x1,%rax
  22:	48 39 d0             	cmp    %rdx,%rax
  25:	74 50                	je     0x77
  27:	80 38 00             	cmpb   $0x0,(%rax)
* 2a:	74 f2                	je     0x1e <-- trapping instruction
  2c:	eb d4                	jmp    0x2
  2e:	41 bc 08 00 00 00    	mov    $0x8,%r12d
  34:	48 89 ea             	mov    %rbp,%rdx
  37:	45 29 dc             	sub    %r11d,%r12d
  3a:	4d 8d 1c 2c          	lea    (%r12,%rbp,1),%r11
  3e:	eb 0c                	jmp    0x4c

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2021/12/07 14:52 linux-next 04fe99a8d936 0230ba3e .config log report info INFO: task hung in rfkill_register
ci-upstream-linux-next-kasan-gce-root 2021/11/24 06:14 linux-next 4b74e088fef6 545ab074 .config log report info INFO: task hung in rfkill_register
* Struck through repros no longer work on HEAD.