IPVS: stopping master sync thread 22787 ...
IPVS: stopping backup sync thread 13919 ...
INFO: task syz-executor0:30093 blocked for more than 140 seconds.
      Not tainted 4.9.113-g47bbcd6 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29656 30093   1064 0x00000004
 ffff8801d5178000 0000000000000000 ffff8801a9063480 ffff8801b8423000
 ffff8801db321c18 ffff8801ade07808 ffffffff839e909d ffffffff81235647
 0000000000000000 ffff8801d51788c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f5cd8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f5cd8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee7587>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f3aac>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f3aac>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff815a4df5>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff815a4df5>] do_last fs/namei.c:3312 [inline]
 [<ffffffff815a4df5>] path_openat+0xed5/0x3590 fs/namei.c:3534
 [<ffffffff815ab777>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156df4d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e2a7>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e2a7>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e2a7>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e2a7>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f93>] 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: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3670:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3768:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8142>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/30093:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a8f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a8f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a4df5>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a4df5>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a4df5>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d963fd08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d963fd40
 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] 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
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa15c>] 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: 30036 Comm: syz-executor0 Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff880194291800 task.stack: ffff8801b6600000
RIP: 0010:[<ffffffff81f1ad21>] 
c [<ffffffff81f1ad21>] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline]
RIP: 0010:[<ffffffff81f1ad21>] 
c [<ffffffff81f1ad21>] check_preemption_disabled+0x51/0x170 lib/smp_processor_id.c:18
RSP: 0018:ffff8801b6606ba8  EFLAGS: 00000046
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90001aa2000
RDX: 0000000000040000 RSI: ffffffff81f1ad21 RDI: ffffffff83e2de20
RBP: ffff8801b6606bd8 R08: ffff880194292188 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003285242c R12: ffffffff83e2de20
R13: ffffffff83cce7a0 R14: ffff8801bc871b28 R15: 000000000000000d
FS:  00007ff91b11f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4247aa000 CR3: 00000001b45c0000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff843bd658
c ffffffff83cce7a0
c ffff8801bc871b28
c dffffc0000000000
c
 ffff8801bc871b28
c 000000000000000d
c ffff8801b6606bf0
c ffffffff81f1ae7c
c
 000000000000000d
c ffff8801b6606c40
c ffffffff816243c5
c 0000020006c50900
c
Call Trace:
 [<ffffffff81f1ae7c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff816243c5>] lookup_bh_lru fs/buffer.c:1327 [inline]
 [<ffffffff816243c5>] __find_get_block+0x75/0x4c0 fs/buffer.c:1356
 [<ffffffff81625399>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81625399>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628d3d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818c5210>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c5210>] fat_ent_bread+0x160/0x2f0 fs/fat/fatent.c:106
 [<ffffffff818c6f0b>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c6f0b>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818b847b>] fat_add_new_entries+0x1fb/0xa80 fs/fat/dir.c:1215
 [<ffffffff818bc319>] fat_add_entries+0xb69/0x1180 fs/fat/dir.c:1370
 [<ffffffff818dc545>] vfat_add_entry+0x1a85/0x2b60 fs/fat/namei_vfat.c:687
 [<ffffffff818de7d5>] vfat_create+0x105/0x350 fs/fat/namei_vfat.c:792
 [<ffffffff8159bd4c>] lookup_open+0x11dc/0x1930 fs/namei.c:3224
 [<ffffffff815a4e18>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a4e18>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815ab777>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156df4d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e2a7>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e2a7>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e2a7>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e2a7>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c