NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.4:6779 blocked for more than 140 seconds.
Not tainted 4.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28040 6779 6421 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2857 [inline]
__schedule+0x832/0x1f00 kernel/sched/core.c:3435
schedule+0x7f/0x1b0 kernel/sched/core.c:3494
schedule_timeout+0x70e/0xd20 kernel/time/timer.c:1777
do_wait_for_common kernel/sched/completion.c:86 [inline]
__wait_for_common kernel/sched/completion.c:107 [inline]
wait_for_common+0x3fb/0x5d0 kernel/sched/completion.c:118
wait_for_completion+0x18/0x20 kernel/sched/completion.c:139
flush_work+0x361/0x700 kernel/workqueue.c:2871
__cancel_work_timer+0x30c/0x440 kernel/workqueue.c:2942
cancel_work_sync+0xb/0x10 kernel/workqueue.c:2978
p9_conn_destroy net/9p/trans_fd.c:870 [inline]
p9_fd_close+0x263/0x400 net/9p/trans_fd.c:896
p9_client_destroy+0x61/0x540 net/9p/client.c:1094
v9fs_session_close+0x3d/0x2a0 fs/9p/v9fs.c:490
v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:233
deactivate_locked_super+0x62/0xb0 fs/super.c:312
v9fs_mount+0x366/0x770 fs/9p/vfs_super.c:214
mount_fs+0x7f/0x2a9 fs/super.c:1222
vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1037
vfs_kern_mount fs/namespace.c:1027 [inline]
do_new_mount fs/namespace.c:2512 [inline]
do_mount+0x366/0x2b30 fs/namespace.c:2842
SYSC_mount fs/namespace.c:3058 [inline]
SyS_mount+0xb1/0xd0 fs/namespace.c:3035
do_syscall_64+0x1c9/0x6a0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x45d4d9
RSP: 002b:00007f447743bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000021180 RCX: 000000000045d4d9
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000118cf90 R08: 00000000200028c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc9a1ed1ff R14: 00007f447743c9c0 R15: 000000000118cf4c
Showing all locks held in the system:
2 locks held by kworker/0:0/3:
#0: ((wq_completion)"events"){+.+.}, at: [<00000000916b0bd7>] process_one_work+0x699/0x1510 kernel/workqueue.c:2084
#1: ((work_completion)(&m->wq)){+.+.}, at: [<00000000354a8438>] process_one_work+0x6cc/0x1510 kernel/workqueue.c:2088
2 locks held by khungtaskd/1062:
#0: (rcu_read_lock){....}, at: [<00000000fc4519fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000fc4519fc>] watchdog+0xfc/0x8d0 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000294b4621>] debug_show_all_locks+0x79/0x222 kernel/locking/lockdep.c:4470
1 lock held by in:imklog/5960:
#0: (&f->f_pos_lock){+.+.}, at: [<00000000375bd1b5>] __fdget_pos+0x8e/0xc0 fs/file.c:765
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1062 Comm: khungtaskd Not tainted 4.16.0-rc1-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+0x141/0x1e1 lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x13/0xb7 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0xf4/0x118 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x598/0x8d0 kernel/hung_task.c:249
kthread+0x316/0x3d0 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:429
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5 Comm: kworker/u4:0 Not tainted 4.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_read_lock_sched_held+0x88/0x120 kernel/rcu/update.c:112
RSP: 0018:ffff8800aec07ce0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff885463a0 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffff8800a9c7ca48 RDI: ffff8800a9c7c9f4
RBP: ffff8800aec07ce8 R08: ffff8800a9c7ca68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800a50db050
R13: ffff8800aec07d98 R14: 1ffff10015d80fa3 R15: ffff8800a50db050
FS: 0000000000000000(0000) GS:ffff8800aec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f744203f000 CR3: 0000000099c26000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_timer_expire_exit include/trace/events/timer.h:121 [inline]
call_timer_fn+0x458/0x590 kernel/time/timer.c:1327
expire_timers+0x268/0x3f0 kernel/time/timer.c:1363
__run_timers kernel/time/timer.c:1666 [inline]
run_timer_softirq+0x1dc/0x530 kernel/time/timer.c:1692
__do_softirq+0x247/0x96d kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x18e/0x1e0 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:541 [inline]
smp_apic_timer_interrupt+0x126/0x5b0 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:772 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:794 [inline]
RIP: 0010:lock_acquire+0x96/0x3e0 kernel/locking/lockdep.c:3915
RSP: 0018:ffff8800a9c97c98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff12
RAX: dffffc0000000000 RBX: ffff8800a9c7c140 RCX: 0000000000000000
RDX: 1ffffffff10226ec RSI: 0000000000000000 RDI: ffffffff88113760
RBP: ffff8800a9c97ce0 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8800a9c7ca48 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:244 [inline]
rcu_read_lock include/linux/rcupdate.h:630 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline]
batadv_nc_worker+0xef/0x630 net/batman-adv/network-coding.c:730
process_one_work+0x76a/0x1510 kernel/workqueue.c:2113
worker_thread+0xcc/0xed0 kernel/workqueue.c:2247
kthread+0x316/0x3d0 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:429
Code: 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 7d 8b 15 cd 6f 07 07 85 d2 74 09 e8 d4 fc ff ff 85 c0 75 08 b8 01 00 00 00 5b 5d c3 93 77 00 00 84 c0 74 4b e8 ca df 00 00 84 c0 74 42 48 b8 00