INFO: task syz-executor.2:9852 can't die for more than 143 seconds.
task:syz-executor.2  state:D stack:28096 pid: 9852 ppid:  8812 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4953 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6234
 schedule+0xd2/0x260 kernel/sched/core.c:6307
 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:3083
 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3170
 p9_conn_destroy net/9p/trans_fd.c:891 [inline]
 p9_fd_close+0x305/0x520 net/9p/trans_fd.c:921
 p9_client_create+0x95a/0x1110 net/9p/client.c:1073
 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:407
 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 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: 0033:0x7fd7843498d9
RSP: 002b:00007fd78185d188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd78444e1a0 RCX: 00007fd7843498d9
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fd7843a3cb4 R08: 0000000020000140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5ee5ea8f R14: 00007fd78185d300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.2:9852 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:28096 pid: 9852 ppid:  8812 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4953 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6234
 schedule+0xd2/0x260 kernel/sched/core.c:6307
 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:3083
 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3170
 p9_conn_destroy net/9p/trans_fd.c:891 [inline]
 p9_fd_close+0x305/0x520 net/9p/trans_fd.c:921
 p9_client_create+0x95a/0x1110 net/9p/client.c:1073
 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:407
 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 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: 0033:0x7fd7843498d9
RSP: 002b:00007fd78185d188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd78444e1a0 RCX: 00007fd7843498d9
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fd7843a3cb4 R08: 0000000020000140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5ee5ea8f R14: 00007fd78185d300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb813a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by kworker/0:3/2932:
 #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:1198 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
 #1: ffffc9000ae1fdb0 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
2 locks held by in:imklog/6232:

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc4-next-20211008-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:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:339
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2968 Comm: systemd-journal Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:jhash2 include/linux/jhash.h:129 [inline]
RIP: 0010:hash_stack lib/stackdepot.c:180 [inline]
RIP: 0010:__stack_depot_save+0xbb/0x4f0 lib/stackdepot.c:329
Code: f4 03 42 f8 41 29 d9 45 01 c1 41 89 d8 01 c3 41 c1 c0 04 45 31 c8 44 29 c0 41 89 c1 44 89 c0 41 01 d8 c1 c0 06 44 31 c8 29 c3 <41> 89 d9 89 c3 44 01 c0 c1 c3 08 44 31 cb 41 89 d9 41 29 d8 01 c3
RSP: 0018:ffffc90001f0fae8 EFLAGS: 00000283
RAX: 0000000033fcd149 RBX: 00000000eadcc910 RCX: 0000000000000001
RDX: ffffc90001f0fb70 RSI: 0000000000000cc0 RDI: 000000000000000c
RBP: ffff88808dfb1000 R08: 000000001a323f3a R09: 00000000e5d5e937
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90001f0fb58
R13: 0000000000000009 R14: 0000000000000009 R15: 0000000000000cc0
FS:  00007fd2ddc088c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2db03f018 CR3: 0000000021ed7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kasan_save_stack+0x38/0x50 mm/kasan/common.c:40
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:259 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3213 [inline]
 slab_alloc mm/slub.c:3221 [inline]
 kmem_cache_alloc+0x209/0x390 mm/slub.c:3226
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags+0x9a/0xe0 include/linux/audit.h:323
 user_path_at_empty+0x2b/0x60 fs/namei.c:2800
 user_path_at include/linux/namei.h:57 [inline]
 do_faccessat+0x127/0x850 fs/open.c:421
 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: 0033:0x7fd2dcec39c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdadc66048 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffdadc68f60 RCX: 00007fd2dcec39c7
RDX: 00007fd2dd934a00 RSI: 0000000000000000 RDI: 00005609093129a3
RBP: 00007ffdadc66080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffdadc68f60 R15: 00007ffdadc66570
 </TASK>
----------------
Code disassembly (best guess):
   0:	f4                   	hlt
   1:	03 42 f8             	add    -0x8(%rdx),%eax
   4:	41 29 d9             	sub    %ebx,%r9d
   7:	45 01 c1             	add    %r8d,%r9d
   a:	41 89 d8             	mov    %ebx,%r8d
   d:	01 c3                	add    %eax,%ebx
   f:	41 c1 c0 04          	rol    $0x4,%r8d
  13:	45 31 c8             	xor    %r9d,%r8d
  16:	44 29 c0             	sub    %r8d,%eax
  19:	41 89 c1             	mov    %eax,%r9d
  1c:	44 89 c0             	mov    %r8d,%eax
  1f:	41 01 d8             	add    %ebx,%r8d
  22:	c1 c0 06             	rol    $0x6,%eax
  25:	44 31 c8             	xor    %r9d,%eax
  28:	29 c3                	sub    %eax,%ebx
* 2a:	41 89 d9             	mov    %ebx,%r9d <-- trapping instruction
  2d:	89 c3                	mov    %eax,%ebx
  2f:	44 01 c0             	add    %r8d,%eax
  32:	c1 c3 08             	rol    $0x8,%ebx
  35:	44 31 cb             	xor    %r9d,%ebx
  38:	41 89 d9             	mov    %ebx,%r9d
  3b:	41 29 d8             	sub    %ebx,%r8d
  3e:	01 c3                	add    %eax,%ebx