syzbot


INFO: task hung in rfkill_unregister

Status: auto-closed as invalid on 2022/01/29 14:25
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 364d, last: 362d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in rfkill_unregister 1 926d 926d 0/1 auto-closed as invalid on 2020/09/13 12:44
upstream INFO: task hung in rfkill_unregister (2) 2 183d 237d 0/24 auto-closed as invalid on 2022/08/27 03:13

Sample crash report:
INFO: task kworker/u4:14:16057 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:14   state:D stack:24840 pid:16057 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
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_unregister+0xda/0x2c0 net/rfkill/core.c:1117
 wiphy_unregister+0x134/0xbf0 net/wireless/core.c:1027
 ieee80211_unregister_hw+0x160/0x1f0 net/mac80211/main.c:1410
 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3583 [inline]
 hwsim_exit_net+0x50e/0xca0 drivers/net/wireless/mac80211_hwsim.c:4346
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2299
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2446
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/u5:0:17481 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:0    state:D stack:27216 pid:17481 ppid:     2 flags:0x00004000
Workqueue: hci3 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:2299
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2446
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task systemd-rfkill:10246 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-rfkill  state:D stack:26008 pid:10246 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:3085
 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3172
 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: 0033:0x7fa59e3dc1b0
RSP: 002b:00007ffddbae7d68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000562145f3c040 RCX: 00007fa59e3dc1b0
RDX: 0000000000000008 RSI: 00007ffddbae7db0 RDI: 0000000000000003
RBP: 00007ffddbae7da8 R08: 0000562145f421b0 R09: 0000000000001010
R10: 0000000000080000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffddbae7da0 R14: 0000000000000000 R15: 0000000000000003
 </TASK>
INFO: task syz-executor.3:10282 blocked for more than 144 seconds.
      Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:23768 pid:10282 ppid:     1 flags:0x00000004
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_fop_open+0x10d/0x720 net/rfkill/core.c:1148
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4c8/0x1250 fs/open.c:822
 do_open fs/namei.c:3426 [inline]
 path_openat+0x1cad/0x2750 fs/namei.c:3559
 do_filp_open+0x1aa/0x400 fs/namei.c:3586
 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_openat fs/open.c:1244 [inline]
 __se_sys_openat fs/open.c:1239 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239
 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: 0033:0x7f6fcb173a04
RSP: 002b:00007ffc1aa291e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffc1aa29928 RCX: 00007f6fcb173a04
RDX: 0000000000000002 RSI: 00007f6fcb21a26f RDI: 00000000ffffff9c
RBP: 00007f6fcb21a26f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 00007ffc1aa293c0 R14: 0000000000000000 R15: 00000000000000f8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb83220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6382:
 #0: ffff88807c1b0ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
4 locks held by kworker/u4:14/16057:
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff8881445ab138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2270
 #1: ffffc90006267db0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2274
 #2: ffffffff8d2f8850 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb00 net/core/net_namespace.c:555
 #3: ffffffff8d6fa6e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xda/0x2c0 net/rfkill/core.c:1117
3 locks held by kworker/u5:0/17481:
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff88807c967138 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2270
 #1: ffffc900040dfdb0 ((work_completion)(&hdev->scan_update)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2274
 #2: ffff8880397dd000 (&hdev->req_lock){+.+.}-{3:3}, at: hci_req_sync net/bluetooth/hci_request.c:209 [inline]
 #2: ffff8880397dd000 (&hdev->req_lock){+.+.}-{3:3}, at: scan_update_work+0x26/0xb0 net/bluetooth/hci_request.c:1911
2 locks held by kworker/u4:3/7969:
2 locks held by systemd-rfkill/10246:
 #0: ffffffff8d6fa6e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x500 net/rfkill/core.c:1260
 #1: ffff8880397dd000 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551
2 locks held by syz-executor.3/10282:
 #0: ffffffff8c5df5e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
 #1: ffffffff8d6fa6e8 (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-rc2-next-20211125-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: 2955 Comm: systemd-journal Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [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+0xd2/0x180 mm/kasan/generic.c:189
Code: 48 83 c0 01 48 39 d0 74 7a 80 38 00 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
RSP: 0018:ffffc90001f5fb78 EFLAGS: 00000046
RAX: fffffbfff20da9f9 RBX: fffffbfff20da9fa RCX: ffffffff815d4511
RDX: fffffbfff20da9fa RSI: 0000000000000004 RDI: ffffffff906d4fc8
RBP: fffffbfff20da9f9 R08: 0000000000000001 R09: ffffffff906d4fcb
R10: fffffbfff20da9f9 R11: 000000000000003f R12: ffffffff906d4fd0
R13: ffffffff906d4fd8 R14: dead000000000100 R15: dffffc0000000000
FS:  00007f2ae508b8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ae1e7b018 CR3: 000000002320c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:511 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:82 [inline]
 do_raw_spin_lock+0x111/0x2b0 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:162
 __debug_check_no_obj_freed lib/debugobjects.c:980 [inline]
 debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1023
 slab_free_hook mm/slub.c:1698 [inline]
 slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1749
 slab_free mm/slub.c:3513 [inline]
 kmem_cache_free+0xba/0x4a0 mm/slub.c:3530
 putname fs/namei.c:270 [inline]
 putname+0xfe/0x140 fs/namei.c:256
 do_sys_openat2+0x153/0x4d0 fs/open.c:1221
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_open fs/open.c:1236 [inline]
 __se_sys_open fs/open.c:1232 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1232
 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: 0033:0x7f2ae461a840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffffabc5ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffffabc61e0 RCX: 00007f2ae461a840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000555d8d818390
RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000555d8d80c040 R14: 00007ffffabc61a0 R15: 0000555d8d8191e0
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 83 c0 01          	add    $0x1,%rax
   4:	48 39 d0             	cmp    %rdx,%rax
   7:	74 7a                	je     0x83
   9:	80 38 00             	cmpb   $0x0,(%rax)
   c:	74 f2                	je     0x0
   e:	48 89 c2             	mov    %rax,%rdx
  11:	b8 01 00 00 00       	mov    $0x1,%eax
  16:	48 85 d2             	test   %rdx,%rdx
  19:	75 56                	jne    0x71
  1b:	5b                   	pop    %rbx
  1c:	5d                   	pop    %rbp
  1d:	41 5c                	pop    %r12
  1f:	c3                   	retq
  20:	48 85 d2             	test   %rdx,%rdx
  23:	74 5e                	je     0x83
  25:	48 01 ea             	add    %rbp,%rdx
  28:	eb 09                	jmp    0x33
* 2a:	48 83 c0 01          	add    $0x1,%rax <-- trapping instruction
  2e:	48 39 d0             	cmp    %rdx,%rax
  31:	74 50                	je     0x83
  33:	80 38 00             	cmpb   $0x0,(%rax)
  36:	74 f2                	je     0x2a
  38:	eb d4                	jmp    0xe
  3a:	41 bc 08 00 00 00    	mov    $0x8,%r12d

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2021/11/30 14:25 linux-next f81e94e91878 80270552 .config log report info INFO: task hung in rfkill_unregister
ci-upstream-linux-next-kasan-gce-root 2021/11/28 15:46 linux-next f81e94e91878 63eeac02 .config log report info INFO: task hung in rfkill_unregister
* Struck through repros no longer work on HEAD.