EXT4-fs (loop5): VFS: Can't find ext4 filesystem
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
INFO: task syz-executor7:16210 blocked for more than 140 seconds.
      Not tainted 4.9.120-gf85543b #24
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D28656 16210   3839 0x00000004
 ffff8801bea81800 0000000000000000 ffff8801d7b3e4c0 ffffffff84629800
 ffff8801db221c18 ffff88019d2bfab8 ffffffff839eedcd ffffffff81237347
 0000000000000000 ffff8801bea820c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839f03cf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839fba08>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839fba08>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81eec337>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122df70>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122df70>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815acfca>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815acfca>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815af9f6>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815af9f6>] SYSC_symlinkat fs/namei.c:4171 [inline]
 [<ffffffff815af9f6>] SyS_symlinkat+0xe6/0x260 fs/namei.c:4158
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813684dc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813684dc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81427d48>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3638:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815db00c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81575c7e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81575c7e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
1 lock held by rsyslogd/3640:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815db00c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3736:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fde72>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82123d42>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor7/16192:
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e38ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e38ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#23/1){+.+.+.}, at: [<ffffffff815acfca>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#23/1){+.+.+.}, at: [<ffffffff815acfca>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor7/16210:
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e38ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e38ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#23/1){+.+.+.}, at: [<ffffffff815acfca>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#23/1){+.+.+.}, at: [<ffffffff815acfca>] filename_create+0x17a/0x490 fs/namei.c:3639

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.120-gf85543b #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d861fd08 ffffffff81eb8049 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9fa0 ffff8801d861fd40
 ffffffff81ec3357 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb8049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb8049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ec3357>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ec32ea>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81368a74>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81368a74>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368a74>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368a74>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ee0d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839ffe9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.120-gf85543b #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff811e6272>] 
c [<ffffffff811e6272>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff811e6272>] 
c [<ffffffff811e6272>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff811e6272>] 
c [<ffffffff811e6272>] static_key_count include/linux/jump_label.h:174 [inline]
RIP: 0010:[<ffffffff811e6272>] 
c [<ffffffff811e6272>] can_migrate_task+0x282/0xa20 kernel/sched/fair.c:7974
RSP: 0018:ffff8801db307bb8  EFLAGS: 00000097
RAX: 0000000000000003 RBX: ffff8801d8519800 RCX: ffff8801d9bd30a8
RDX: 0000000000000004 RSI: ffff8801db221c18 RDI: ffffffff84e992c0
RBP: ffff8801db307c10 R08: ffff8801db2225a0 R09: ffff8801d8519800
R10: ffffed0043fffa09 R11: 0000000000000001 R12: ffffffff84871040
R13: 0000000000000001 R14: ffff8801db307d88 R15: ffff8801db307ce8
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001713000 CR3: 00000001c14bd000 CR4: 00000000001606f0
Stack:
 ffff8801d9a6b8c0
c 0000000000000046
c ffff8801db307d28
c ffff8801db307d30
c
 1ffffffff098c050
c ffffed003b660fa5
c ffff8801db221c00
c ffff8801db221c00
c
 dffffc0000000000
c ffff8801db307d88
c ffff8801d85198a8
c ffff8801db307db0
c
Call Trace:
 <IRQ> 
d [<ffffffff812052b6>] detach_tasks kernel/sched/fair.c:8087 [inline]
 <IRQ> 
d [<ffffffff812052b6>] load_balance+0x816/0x2fa0 kernel/sched/fair.c:9512
 [<ffffffff81209f2e>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10115
 [<ffffffff8120a729>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10333
 [<ffffffff83a068c0>] __do_softirq+0x210/0x940 kernel/softirq.c:288
 [<ffffffff8114cf94>] invoke_softirq kernel/softirq.c:368 [inline]
 [<ffffffff8114cf94>] irq_exit+0x114/0x150 kernel/softirq.c:409
 [<ffffffff83a04461>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff83a01fd0>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839fe8d6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:55
 [<ffffffff839fdf15>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839fdf15>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839fed35>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81224ed5>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81224ed5>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81224ed5>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810af308>] start_secondary+0x328/0x400 arch/x86/kernel/smpboot.c:251
Code: 
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c