INFO: task syz-executor.5:31474 blocked for more than 140 seconds.
Not tainted 4.14.175-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D27728 31474 6352 0x00000004
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x946/0xe40 kernel/time/timer.c:1723
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common kernel/sched/completion.c:123 [inline]
wait_for_completion+0x241/0x390 kernel/sched/completion.c:144
flush_work+0x3f5/0x780 kernel/workqueue.c:2893
__cancel_work_timer+0x2d0/0x460 kernel/workqueue.c:2964
p9_conn_destroy net/9p/trans_fd.c:872 [inline]
p9_fd_close+0x28d/0x420 net/9p/trans_fd.c:899
p9_client_create+0x787/0x10f0 net/9p/client.c:1095
v9fs_session_init+0x1dc/0x1620 fs/9p/v9fs.c:422
v9fs_mount+0x79/0x850 fs/9p/vfs_super.c:135
mount_fs+0x92/0x2a0 fs/super.c:1237
vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x3c9/0x24f0 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xa8/0x120 fs/namespace.c:3072
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007fa3c440fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa3c44106d4 RCX: 000000000045c889
RDX: 0000000020000100 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000076bfa0 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000440 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000074a R14: 00000000004ca0c5 R15: 000000000076bfac
Showing all locks held in the system:
1 lock held by khungtaskd/1056:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81465bb3>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
1 lock held by in:imklog/6024:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff8191b836>] __fdget_pos+0xa6/0xc0 fs/file.c:769
2 locks held by kworker/0:2/21888:
#0: ("events"){+.+.}, at: [<ffffffff813b67f7>] work_static include/linux/workqueue.h:199 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67f7>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67f7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67f7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
#1: ((&m->rq)){+.+.}, at: [<ffffffff813b6831>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 4.14.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5e2/0xb80 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a9852200 task.stack: ffff8880a9860000
RIP: 0010:schedule_timeout+0x43f/0xe40 kernel/time/timer.c:1747
RSP: 0018:ffff8880a9867c50 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 000000010001ba2e RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffff8880a9867cd0
RBP: ffff8880a9867d68 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1101530cf90
R13: ffff8880aeb239c0 R14: ffff8880aeb239c0 R15: ffff8880a9867cd0
FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1aa5442008 CR3: 0000000094e17000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 00 48 8d 70 a0 e8 52 e2 0c fb e8 7d d6 19 fb 48 8b 74 24 60 48 8b 7c 24 28 e8 8e 38 00 00 e8 69 d6 19 fb e8 34 1c ff ff 4c 89 ff <e8> 8c e4 0c fb 48 c7 c6 20 ee d8 87 4c 89 ff e8 3d e9 bd fc 48