Buffer I/O error on dev loop0, logical block 16, async page read
INFO: task syz-executor4:30869 blocked for more than 120 seconds.
Not tainted 4.15.0+ #296
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4 D23552 30869 4234 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
filemap_fdatawait_keep_errors+0x2a/0xb0 mm/filemap.c:600
fdatawait_one_bdev+0x50/0x70 fs/sync.c:95
iterate_bdevs+0x109/0x260 fs/block_dev.c:2147
sys_sync+0x120/0x1c0 fs/sync.c:117
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x453299
RSP: 002b:00007f15a5e38c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000003d9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4cf8
R13: 00000000ffffffff R14: 00007f15a5e396d4 R15: 0000000000000000
Showing all locks held in the system:
3 locks held by kworker/u4:1/21:
#0: ((wq_completion)"writeback"){+.+.}, at: [<0000000068bb7994>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084
#1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<0000000087fed8ea>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088
#2: (&type->s_umount_key#27){++++}, at: [<00000000b2d337bf>] trylock_super+0x20/0x100 fs/super.c:395
2 locks held by khungtaskd/757:
#0: (rcu_read_lock){....}, at: [<000000008cf8ac19>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<000000008cf8ac19>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000beefb0e2>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4029:
#0: (&f->f_pos_lock){+.+.}, at: [<0000000082f6e8dc>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4151:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4152:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4153:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4154:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4155:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4156:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4157:
#0: (&tty->ldisc_sem){++++}, at: [<000000003637b4fb>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000000a8265a5>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by blkid/30421:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000e9a2034c>] blkdev_put+0x2a/0x4f0 fs/block_dev.c:1793
1 lock held by syz-executor4/30869:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000684dff21>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2145
1 lock held by syz-executor4/30878:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000684dff21>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2145
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 757 Comm: khungtaskd Not tainted 4.15.0+ #296
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0+ #296
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tick_do_update_jiffies64 kernel/time/tick-sched.c:65 [inline]
RIP: 0010:tick_nohz_update_jiffies kernel/time/tick-sched.c:506 [inline]
RIP: 0010:tick_nohz_irq_enter kernel/time/tick-sched.c:1152 [inline]
RIP: 0010:tick_irq_enter+0x1bf/0x390 kernel/time/tick-sched.c:1169
RSP: 0018:ffff8801db507d28 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 0000000000000093 RCX: 0000000000000000
RDX: ffffffff8814cca0 RSI: 0000000000000000 RDI: ffffffff8814cca0
RBP: ffff8801db507d48 R08: ffff88021fff805c R09: ffff88021fff8048
R10: ffff88021fff8050 R11: ffff88021fff805d R12: 0000000000018649
R13: ffff8801db5266a0 R14: 00000056375e1449 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ab0000 CR3: 0000000006a22002 CR4: 00000000001606e0
Call Trace:
<IRQ>
irq_enter+0xb6/0xd0 kernel/softirq.c:346
scheduler_ipi+0x23d/0x820 kernel/sched/core.c:1794
smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:962
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801d9f1fcb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffff1003b3e3f99 RCX: 0000000000000000
RDX: 1ffffffff0d59280 RSI: 0000000000000001 RDI: ffffffff86ac9400
RBP: ffff8801d9f1fcb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801d9f1fd68 R14: ffffffff87268d60 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:354
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351
start_secondary+0x40a/0x590 arch/x86/kernel/smpboot.c:267
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 00 fa 66 0f 1f 44 00 00 e8 6f 63 f1 ff 48 c7 c7 a0 cc 14 88 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 48 89 fa 4c 2b 25 b1 71 b0 06 <48> c1 ea 03 80 3c 02 00 0f 85 a4 01 00 00 4c 3b 25 3c 6e b0 06