syzbot


INFO: task hung in rfcomm_process_sessions (2)

Status: fixed on 2023/06/08 14:41
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+d761775dff24be3ad4be@syzkaller.appspotmail.com
Fix commit: 1d80d57ffcb5 Bluetooth: Fix possible deadlock in rfcomm_sk_state_change
First crash: 784d, last: 506d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 1d80d57ffcb55488f0ec0b77928d4f82d16b6a90
Author: Ying Hsu <yinghsu@chromium.org>
Date: Wed Jan 11 03:16:14 2023 +0000

  Bluetooth: Fix possible deadlock in rfcomm_sk_state_change

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] INFO: task hung in rfcomm_process_sessions (2) 1 (3) 2023/02/02 14:01
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in rfcomm_process_sessions bluetooth 1 971d 971d 0/26 auto-closed as invalid on 2021/12/18 18:49
Last patch testing requests (11)
Created Duration User Patch Repo Result
2022/12/09 05:31 12m retest repro upstream report log
2022/12/09 00:31 12m retest repro upstream report log
2022/12/08 13:31 11m retest repro upstream report log
2022/12/08 00:31 11m retest repro upstream report log
2022/12/07 23:31 10m retest repro upstream report log
2022/12/07 13:31 11m retest repro upstream report log
2022/12/07 11:31 11m retest repro upstream report log
2022/12/07 05:31 11m retest repro upstream report log
2022/12/06 20:31 11m retest repro upstream report log
2022/12/06 16:31 11m retest repro upstream report log
2022/03/30 10:26 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ cffb2b72d3ed OK
Fix bisection attempts (7)
Created Duration User Patch Repo Result
2023/02/01 22:26 6h27m bisect fix upstream job log (1)
2022/10/12 17:55 27m (2) bisect fix upstream job log (0) log
2022/08/28 00:23 22m bisect fix upstream job log (0) log
2022/07/29 00:00 22m bisect fix upstream job log (0) log
2022/06/28 23:37 22m bisect fix upstream job log (0) log
2022/05/29 20:20 23m bisect fix upstream job log (0) log
2022/04/29 19:36 20m bisect fix upstream job log (0) log

Sample crash report:
INFO: task krfcommd:2706 blocked for more than 143 seconds.
      Tainted: G        W         5.17.0-syzkaller-12817-gcffb2b72d3ed #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:krfcommd        state:D stack:28984 pid: 2706 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5073 [inline]
 __schedule+0x937/0x1090 kernel/sched/core.c:6382
 schedule+0xeb/0x1b0 kernel/sched/core.c:6454
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6513
 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:673
 __mutex_lock kernel/locking/mutex.c:733 [inline]
 mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
 rfcomm_process_sessions+0x21/0x3f0 net/bluetooth/rfcomm/core.c:2015
 rfcomm_run+0x195/0x2c0 net/bluetooth/rfcomm/core.c:2122
 kthread+0x2a3/0x2d0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
INFO: task syz-executor296:3618 blocked for more than 143 seconds.
      Tainted: G        W         5.17.0-syzkaller-12817-gcffb2b72d3ed #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor296 state:D stack:26552 pid: 3618 ppid:  3612 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5073 [inline]
 __schedule+0x937/0x1090 kernel/sched/core.c:6382
 schedule+0xeb/0x1b0 kernel/sched/core.c:6454
 __lock_sock+0x1cf/0x330 net/core/sock.c:2770
 lock_sock_nested+0x9f/0x100 net/core/sock.c:3317
 lock_sock include/net/sock.h:1682 [inline]
 rfcomm_sk_state_change+0x63/0x300 net/bluetooth/rfcomm/sock.c:73
 __rfcomm_dlc_close+0x2cc/0x480 net/bluetooth/rfcomm/core.c:489
 rfcomm_dlc_close+0x10d/0x1c0 net/bluetooth/rfcomm/core.c:520
 __rfcomm_sock_close+0x101/0x220 net/bluetooth/rfcomm/sock.c:220
 rfcomm_sock_shutdown+0xa5/0x220 net/bluetooth/rfcomm/sock.c:905
 rfcomm_sock_release+0x55/0x120 net/bluetooth/rfcomm/sock.c:925
 __sock_release net/socket.c:650 [inline]
 sock_close+0xd8/0x260 net/socket.c:1318
 __fput+0x3f6/0x860 fs/file_table.c:317
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x5e3/0x20f0 kernel/exit.c:794
 do_group_exit+0x2af/0x2b0 kernel/exit.c:924
 get_signal+0x23e8/0x23f0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xa1/0x740 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:149 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:187 [inline]
 exit_to_user_mode_prepare+0x165/0x200 kernel/entry/common.c:222
 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:315
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4e731503f9
RSP: 002b:00007fff14a0e988 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 0000555556a333b8 RCX: 00007f4e731503f9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000072 R14: 00007fff14a0ea10 R15: 0000000000000000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Tainted: G        W         5.17.0-syzkaller-12817-gcffb2b72d3ed #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+0x1dc/0x2d8 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc82/0xcd0 kernel/hung_task.c:369
 kthread+0x2a3/0x2d0 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: 8 Comm: kworker/u4:0 Tainted: G        W         5.17.0-syzkaller-12817-gcffb2b72d3ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:bcmp+0x1/0x170 lib/string.c:801
Code: 7e fd eb c5 44 89 f9 80 e1 07 38 c1 7c ce 4c 89 ff e8 33 7c 7e fd eb c4 31 ed 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 66 90 55 <41> 57 41 56 41 55 41 54 53 49 89 d6 49 89 f7 48 89 fb 49 bd 00 00
RSP: 0018:ffffc900000d7930 EFLAGS: 00000297
RAX: 1ffffffff15103dd RBX: ffffffff81d6d87e RCX: dffffc0000000000
RDX: 0000000000000005 RSI: ffffffff8f7f6000 RDI: ffffffff81d6d87e
RBP: ffffc900000d7a80 R08: ffffffff81d6d87e R09: ffffffff845cf58d
R10: 0000000000000003 R11: ffff88813fe6d700 R12: ffffffff8a881e6a
R13: ffffffff8f7f6000 R14: ffffffff8f7f6000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e1e7f11600 CR3: 000000000ca8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __jump_label_patch+0x24d/0x410 arch/x86/kernel/jump_label.c:65
 arch_jump_label_transform_queue+0x49/0xd0 arch/x86/kernel/jump_label.c:137
 __jump_label_update+0x15d/0x350 kernel/jump_label.c:451
 static_key_disable_cpuslocked+0xcc/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate+0x3c8/0x460 mm/kfence/core.c:793
 process_one_work+0x83c/0x11a0 kernel/workqueue.c:2289
 worker_thread+0xa6c/0x1290 kernel/workqueue.c:2436
 kthread+0x2a3/0x2d0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
----------------
Code disassembly (best guess):
   0:	7e fd                	jle    0xffffffff
   2:	eb c5                	jmp    0xffffffc9
   4:	44 89 f9             	mov    %r15d,%ecx
   7:	80 e1 07             	and    $0x7,%cl
   a:	38 c1                	cmp    %al,%cl
   c:	7c ce                	jl     0xffffffdc
   e:	4c 89 ff             	mov    %r15,%rdi
  11:	e8 33 7c 7e fd       	callq  0xfd7e7c49
  16:	eb c4                	jmp    0xffffffdc
  18:	31 ed                	xor    %ebp,%ebp
  1a:	89 e8                	mov    %ebp,%eax
  1c:	5b                   	pop    %rbx
  1d:	41 5c                	pop    %r12
  1f:	41 5d                	pop    %r13
  21:	41 5e                	pop    %r14
  23:	41 5f                	pop    %r15
  25:	5d                   	pop    %rbp
  26:	c3                   	retq
  27:	66 90                	xchg   %ax,%ax
  29:	55                   	push   %rbp
* 2a:	41 57                	push   %r15 <-- trapping instruction
  2c:	41 56                	push   %r14
  2e:	41 55                	push   %r13
  30:	41 54                	push   %r12
  32:	53                   	push   %rbx
  33:	49 89 d6             	mov    %rdx,%r14
  36:	49 89 f7             	mov    %rsi,%r15
  39:	48 89 fb             	mov    %rdi,%rbx
  3c:	49                   	rex.WB
  3d:	bd                   	.byte 0xbd

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/03/29 13:29 upstream cffb2b72d3ed 6bdac766 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/29 11:10 upstream cffb2b72d3ed 6bdac766 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/28 23:09 upstream ae085d7f9365 ee339263 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/27 20:34 upstream f022814633e1 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/27 18:14 upstream f022814633e1 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/27 09:37 upstream bddac7c1e02b 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/27 08:03 upstream bddac7c1e02b 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/27 03:29 upstream bddac7c1e02b 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/26 20:18 upstream 52d543b5497c 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/26 18:33 upstream 52d543b5497c 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/26 14:59 upstream 52d543b5497c 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/26 11:34 upstream 52d543b5497c 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/26 01:30 upstream 34af78c4e616 89bc8608 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
2022/03/30 19:36 upstream d888c83fcec7 42718dd6 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in rfcomm_process_sessions
* Struck through repros no longer work on HEAD.