syzbot


INFO: task hung in console_callback (2)

Status: auto-closed as invalid on 2022/06/05 01:15
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 271d, last: 271d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in console_callback 7 878d 1045d 0/24 closed as dup on 2020/08/16 15:22
linux-4.14 INFO: task hung in console_callback 1 985d 985d 0/1 auto-closed as invalid on 2020/07/20 15:40
linux-4.19 INFO: task hung in console_callback (2) 1 742d 742d 0/1 auto-closed as invalid on 2021/03/20 18:26
upstream INFO: task hung in console_callback (3) 11 100d 144d 0/24 auto-obsoleted due to no activity on 2022/11/22 14:53
linux-4.19 INFO: task hung in console_callback 1 1057d 1057d 0/1 auto-closed as invalid on 2020/05/10 04:25

Sample crash report:
INFO: task kworker/1:1:12751 blocked for more than 143 seconds.
      Not tainted 5.17.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:22168 pid:12751 ppid:     2 flags:0x00004000
Workqueue: events console_callback
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4995 [inline]
 __schedule+0xa94/0x4910 kernel/sched/core.c:6304
 schedule+0xd2/0x260 kernel/sched/core.c:6377
 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
 __down_common+0x2e0/0x420 kernel/locking/semaphore.c:224
 down+0x70/0x90 kernel/locking/semaphore.c:62
 console_lock+0x28/0x80 kernel/printk/printk.c:2524
 console_callback+0x5f/0x4c0 drivers/tty/vt/vt.c:2980
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb845e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460
2 locks held by getty/3283:
 #0: ffff88814a92e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002b662e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2075
2 locks held by kworker/u4:11/6312:
2 locks held by kworker/1:1/12751:
 #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:631 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:658 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x890/0x1650 kernel/workqueue.c:2278
 #1: ffffc90000cd7db8 (console_work){+.+.}-{0:0}, at: process_one_work+0x8c4/0x1650 kernel/workqueue.c:2282
2 locks held by syz-executor.0/15880:

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc7-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+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:369
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 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: 6312 Comm: kworker/u4:11 Not tainted 5.17.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:unwind_next_frame+0xd02/0x1ce0 arch/x86/kernel/unwind_orc.c:539
Code: d4 f1 ff ff 4c 8b 44 24 28 84 c0 48 8b 4c 24 30 0f 84 21 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 4c 8b 64 24 60 <48> c1 ea 03 80 3c 02 00 0f 85 86 0e 00 00 48 8b 14 24 4d 89 66 38
RSP: 0018:ffffc900107d7400 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: 1ffff920020fae88 RCX: ffffffff8ea360c3
RDX: ffffc900107d7510 RSI: ffffc900107d7958 RDI: ffffc900107d7958
RBP: 0000000000000001 R08: ffffffff8ea360be R09: 0000000000000001
R10: fffff520020faea6 R11: 0000000000088078 R12: ffffc900107d7960
R13: ffffc900107d750d R14: ffffc900107d74d8 R15: ffffffff8ea360c2
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c003271000 CR3: 000000000b88e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kfree+0xd0/0x390 mm/slub.c:4562
 batadv_tvlv_container_release net/batman-adv/tvlv.c:102 [inline]
 kref_put include/linux/kref.h:65 [inline]
 batadv_tvlv_container_put net/batman-adv/tvlv.c:115 [inline]
 batadv_tvlv_container_remove+0x20b/0x2a0 net/batman-adv/tvlv.c:198
 batadv_tvlv_container_register+0x1c0/0x400 net/batman-adv/tvlv.c:254
 batadv_tt_tvlv_container_update+0x1d8/0x780 net/batman-adv/translation-table.c:1052
 batadv_tt_local_commit_changes_nolock+0xc3d/0xd80 net/batman-adv/translation-table.c:3691
 batadv_tt_local_commit_changes+0x22/0x30 net/batman-adv/translation-table.c:3719
 batadv_iv_ogm_schedule_buff+0x10d8/0x1430 net/batman-adv/bat_iv_ogm.c:812
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x910 net/batman-adv/bat_iv_ogm.c:1713
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	ff 4c 8b 44          	decl   0x44(%rbx,%rcx,4)
   4:	24 28                	and    $0x28,%al
   6:	84 c0                	test   %al,%al
   8:	48 8b 4c 24 30       	mov    0x30(%rsp),%rcx
   d:	0f 84 21 07 00 00    	je     0x734
  13:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1a:	fc ff df
  1d:	48 8b 54 24 08       	mov    0x8(%rsp),%rdx
  22:	4c 8b 64 24 60       	mov    0x60(%rsp),%r12
* 27:	48 c1 ea 03          	shr    $0x3,%rdx <-- trapping instruction
  2b:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  2f:	0f 85 86 0e 00 00    	jne    0xebb
  35:	48 8b 14 24          	mov    (%rsp),%rdx
  39:	4d 89 66 38          	mov    %r12,0x38(%r14)

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2022/03/07 01:06 upstream ffb217a13a2e 7bdd8b2c .config log report info INFO: task hung in console_callback
* Struck through repros no longer work on HEAD.