netlink: 120 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 120 bytes leftover after parsing attributes in process `syz-executor4'.
Buffer I/O error on dev loop0, logical block 3, async page read
INFO: task syz-executor1:20956 blocked for more than 120 seconds.
Not tainted 4.16.0-rc6+ #365
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D23248 20956 4288 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
io_schedule+0x1c/0x70 kernel/sched/core.c:5115
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_range mm/filemap.c:558 [inline]
filemap_write_and_wait_range+0x74/0xc0 mm/filemap.c:659
generic_file_read_iter+0x409/0x28e0 mm/filemap.c:2334
blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928
call_read_iter include/linux/fs.h:1776 [inline]
do_iter_readv_writev+0x630/0x830 fs/read_write.c:651
do_iter_read+0x21a/0x5a0 fs/read_write.c:895
vfs_readv+0x121/0x1c0 fs/read_write.c:959
do_readv+0xfc/0x2a0 fs/read_write.c:992
SYSC_readv fs/read_write.c:1079 [inline]
SyS_readv+0x27/0x30 fs/read_write.c:1076
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454239
RSP: 002b:00007f4e76c1cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f4e76c1d6d4 RCX: 0000000000454239
RDX: 0000000000000003 RSI: 0000000020000400 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000479 R14: 00000000006f7bf8 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/799:
#0: (rcu_read_lock){....}, at: [<000000003fd8abbd>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<000000003fd8abbd>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<000000004ba2f78c>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
2 locks held by getty/4213:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4214:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4215:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4216:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4217:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4218:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4219:
#0: (&tty->ldisc_sem){++++}, at: [<000000004eb4f83c>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004d2d8412>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
3 locks held by kworker/u4:12/18250:
#0: ((wq_completion)"writeback"){+.+.}, at: [<000000006239f21f>] work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<000000006239f21f>] set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<000000006239f21f>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<000000006239f21f>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<0000000026addac6>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (&type->s_umount_key#27){.+.+}, at: [<0000000031664d73>] trylock_super+0x20/0x100 fs/super.c:395
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 799 Comm: khungtaskd Not tainted 4.16.0-rc6+ #365
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+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 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:406
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