Buffer I/O error on dev loop0, logical block 3, lost async page write
INFO: task syz-executor6:8447 blocked for more than 120 seconds.
Not tainted 4.15.0+ #294
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6 D21200 8447 4242 0x00000004
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
io_schedule+0x1c/0x70 kernel/sched/core.c:5096
wait_on_page_bit_common+0x4b3/0x770 mm/filemap.c:1099
wait_on_page_bit mm/filemap.c:1132 [inline]
wait_on_page_writeback include/linux/pagemap.h:546 [inline]
__filemap_fdatawait_range+0x282/0x430 mm/filemap.c:533
file_write_and_wait_range+0xd7/0x100 mm/filemap.c:756
blkdev_fsync+0x67/0xb0 fs/block_dev.c:623
vfs_fsync_range+0x110/0x260 fs/sync.c:196
generic_write_sync include/linux/fs.h:2679 [inline]
blkdev_write_iter+0x2e6/0x3e0 fs/block_dev.c:1895
call_write_iter include/linux/fs.h:1781 [inline]
do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
vfs_iter_write+0x77/0xb0 fs/read_write.c:945
iter_file_splice_write+0x7db/0xf30 fs/splice.c:749
do_splice_from fs/splice.c:851 [inline]
direct_splice_actor+0x125/0x180 fs/splice.c:1018
splice_direct_to_actor+0x2c1/0x820 fs/splice.c:973
do_splice_direct+0x29b/0x3c0 fs/splice.c:1061
do_sendfile+0x5c9/0xe80 fs/read_write.c:1413
SYSC_sendfile64 fs/read_write.c:1468 [inline]
SyS_sendfile64+0xbd/0x160 fs/read_write.c:1460
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x453299
RSP: 002b:00007f6c23f72c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 00000000200ddff8 RSI: 0000000000000015 RDI: 0000000000000013
RBP: 0000000000000265 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000100000001 R11: 0000000000000212 R12: 00000000006f2a18
R13: 00000000ffffffff R14: 00007f6c23f736d4 R15: 0000000000000000
Showing all locks held in the system:
3 locks held by kworker/u4:1/21:
#0: ((wq_completion)"writeback"){+.+.}, at: [<000000007aea62d2>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084
#1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<000000001a929479>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088
#2: (&type->s_umount_key#27){.+.+}, at: [<0000000001321065>] trylock_super+0x20/0x100 fs/super.c:395
2 locks held by khungtaskd/756:
#0: (rcu_read_lock){....}, at: [<00000000a4c133b6>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000a4c133b6>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<0000000081d6cd9a>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
2 locks held by getty/4161:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4162:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4163:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4164:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4165:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4166:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/7455:
#0: (&tty->ldisc_sem){++++}, at: [<000000002f404724>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000f2f456fb>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 756 Comm: khungtaskd Not tainted 4.15.0+ #294
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:542
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