Buffer I/O error on dev loop0, logical block 0, lost async page write
INFO: task syz-executor1:14117 blocked for more than 120 seconds.
Not tainted 4.15.0+ #210
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D26432 14117 4227 0x20020004
Call Trace:
context_switch kernel/sched/core.c:2845 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3421
schedule+0xf5/0x430 kernel/sched/core.c:3480
blk_mq_freeze_queue_wait+0x1bb/0x400 block/blk-mq.c:136
blk_freeze_queue+0x4a/0x80 block/blk-mq.c:165
blk_mq_freeze_queue+0x15/0x20 block/blk-mq.c:174
loop_change_fd drivers/block/loop.c:667 [inline]
lo_ioctl+0x10ce/0x1b70 drivers/block/loop.c:1361
lo_compat_ioctl+0xab/0x140 drivers/block/loop.c:1556
compat_blkdev_ioctl+0x3ae/0x1840 block/compat_ioctl.c:406
C_SYSC_ioctl fs/compat_ioctl.c:1473 [inline]
compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1419
do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
do_fast_syscall_32+0x3ee/0xfa1 arch/x86/entry/common.c:392
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7f44c79
RSP: 002b:00000000f774008c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000004c06
RDX: 0000000000000013 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/759:
#0: (rcu_read_lock){....}, at: [<00000000b3b533f6>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000b3b533f6>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000440cd9e2>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4029:
#0: (&f->f_pos_lock){+.+.}, at: [<000000007729bd98>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4151:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4152:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4153:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4154:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4155:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4156:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4157:
#0: (&tty->ldisc_sem){++++}, at: [<00000000903280c4>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fb09d1cd>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor1/14117:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000b6589539>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 759 Comm: khungtaskd Not tainted 4.15.0+ #210
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+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 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+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54