FAT-fs (loop3): bogus number of reserved sectors
FAT-fs (loop3): Can't find a valid FAT filesystem
INFO: task syz-executor5:25672 blocked for more than 140 seconds.
      Not tainted 4.9.117-g8b21e85 #19
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D29384 25672  18233 0x00000004
 ffff8801d30e8000 0000000000000000 ffff88019bfaea00 ffffffff84629800
 ffff8801db221c18 ffff88019cccf808 ffffffff839ebd0d ffffffff81235687
 0000000000000000 ffff8801d30e88c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839ed30f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f8948>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f8948>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8ec7>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f671c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f671c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff815a51a5>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff815a51a5>] do_last fs/namei.c:3312 [inline]
 [<ffffffff815a51a5>] path_openat+0xed5/0x3590 fs/namei.c:3534
 [<ffffffff815abb27>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e2fd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e657>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e657>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e657>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e657>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] 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: [<ffffffff813667fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813667fc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426017>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3607:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
1 lock held by rsyslogd/3609:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3705:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fadb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821207f2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor5/25665:
 #0:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff81595061>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff81595061>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor5/25672:
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e0e3f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e0e3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] path_openat+0xed5/0x3590 fs/namei.c:3534
1 lock held by syz-executor5/25756:
 #0:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff81595061>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff81595061>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor5/25757:
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e0e3f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e0e3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a51a5>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d869fd08 ffffffff81eb4be9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d869fd40
 ffffffff81ebfee7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebfee7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebfe7a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366d94>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d94>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d94>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d94>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcddc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84629800 task.stack: ffffffff84600000
RIP: 0010:[<ffffffff811e9e80>] 
c [<ffffffff811e9e80>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff811e9e80>] 
c [<ffffffff811e9e80>] cpufreq_update_util kernel/sched/sched.h:2010 [inline]
RIP: 0010:[<ffffffff811e9e80>] 
c [<ffffffff811e9e80>] cfs_rq_util_change kernel/sched/fair.c:3231 [inline]
RIP: 0010:[<ffffffff811e9e80>] 
c [<ffffffff811e9e80>] update_cfs_rq_load_avg+0xb90/0x1f10 kernel/sched/fair.c:3300
RSP: 0018:ffff8801db207c90  EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8801db221ca0 RCX: 1ffffffff0886880
RDX: 1ffff1003b6430da RSI: ffffffff81f1c62b RDI: ffffffff84434400
RBP: ffff8801db207d30 R08: 0000000000000001 R09: 00000000000630aa
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801db2186d0
R13: 0000000000000001 R14: ffff8801db221d68 R15: ffff8801db221c00
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca5d8eff8 CR3: 00000001c223b000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff810ced53
c ffff8801db207ca8
c ffffffff84629800
c fffffbfff08c5418
c
 ffffffff8462a0c8
c 0000000000038fd2
c 0000000010d58629
c 0000000000000b56
c
 ffff8801db221d20
c 0000000000000002
c 0000000000000003
c 0000000000000003
c
Call Trace:
 [<ffffffff811f251a>] update_blocked_averages+0x26a/0x520 kernel/sched/fair.c:8202
 [<ffffffff81207c34>] rebalance_domains+0xe4/0xbc0 kernel/sched/fair.c:10076
 [<ffffffff81208a09>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10333
 [<ffffffff83a037fb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b277>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b277>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff83a013a1>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839fef10>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839fb816>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839fae55>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839fae55>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839fbc75>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81223215>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81223215>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81223215>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff839e8adc>] rest_init+0x183/0x189 init/main.c:409
 [<ffffffff84c97943>] start_kernel+0x67e/0x6b2 init/main.c:664
 [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
c48 
cc1 
ce9 
c03 
c80 
c3c 
c11 
c00 
c0f 
c85 
cc6 
c0f 
c00 
c00 
c4c 
c03 
c24 
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c00 
c44 
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c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c4c 
c89 
ce2 
c48 
cc1 
cea 
c03 
c80 
c3c 
c02 
c00 
c<0f> 
c85 
c96 
c0f 
c00 
c00 
c4d 
c8b 
c24 
c24 
ce8 
cc1 
c20 
c09 
c00 
c85 
cc0 
c74 
c0d 
c80 
c3d 
c