NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.1:10090 blocked for more than 140 seconds.
Not tainted 4.14.180-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D27648 10090 6385 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
_rcu_barrier+0x285/0x400 kernel/rcu/tree.c:3611
netdev_run_todo+0xed/0x710 net/core/dev.c:7913
tun_detach drivers/net/tun.c:587 [inline]
tun_chr_close+0x46/0x60 drivers/net/tun.c:2671
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416421
RSP: 002b:00007ffdf473f1b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000416421
RDX: 0000000000000000 RSI: 00000000000016af RDI: 0000000000000005
RBP: 0000000000000001 R08: 00000000aab9f6af R09: 00000000aab9f6b3
R10: 00007ffdf473f2a0 R11: 0000000000000293 R12: 000000000078c900
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078bf0c
Showing all locks held in the system:
1 lock held by khungtaskd/1057:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81465d33>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by khugepaged/1064:
#0: (pcpu_drain_mutex){+.+.}, at: [<ffffffff816f3e3a>] drain_all_pages+0x4a/0x570 mm/page_alloc.c:2493
2 locks held by agetty/6295:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff833b1c62>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff833a58a4>] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.1/10090:
#0: (rcu_preempt_state.barrier_mutex){+.+.}, at: [<ffffffff814bbc36>] _rcu_barrier+0x56/0x400 kernel/rcu/tree.c:3546
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 4.14.180-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: 9902 Comm: syz-executor.4 Not tainted 4.14.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88805848c340 task.stack: ffff88804c6f0000
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:addr_limit_user_check include/linux/syscalls.h:240 [inline]
RIP: 0010:prepare_exit_to_usermode+0x83/0x210 arch/x86/entry/common.c:189
RSP: 0000:ffff88804c6f7f38 EFLAGS: 00000046
RAX: 00007ffffffff000 RBX: ffff88805848c340 RCX: 0000000000000000
RDX: 1ffff1100b091af3 RSI: 1ffff110098defdc RDI: ffff88805848d798
RBP: ffff88804c6f7f58 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805848c340
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fe5e8505700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000353989e0 CR3: 000000008f9fd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
retint_user+0x8/0x18
RIP: 0033:0x405be9
RSP: 002b:00007fe5e8504a70 EFLAGS: 00010202
RAX: 00000000353989d0 RBX: 0000000000508a20 RCX: 0000000000416687
RDX: 5b3766e45f25eb1c RSI: 0000000000000000 RDI: 0000000000000007
RBP: 000000000078c0e0 R08: 00007fe5e8504a70 R09: 000000000078c0e0
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000bf9 R14: 00000000004ce1ea R15: 00007fe5e85056d4
Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 85 01 00 00 48 b8 00 f0 ff ff ff 7f 00 00 49 39 84 24 58 14 00 00 0f 85 e8 1c 00 00 <e8> a8 d9 59 00 65 48 8b 04 25 40 ee 01 00 f0 80 60 03 7f e8 95