9pnet: Insufficient options for proto=fd
IPVS: stopping master sync thread 685 ...
INFO: task syz-executor0:12446 blocked for more than 140 seconds.
      Not tainted 4.9.118-g856452b #21
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27240 12446      1 0x00000004
 ffff88019f3f8000 0000000000000000 ffff8801c8fcb9c0 ffff8801d9a6b000
 ffff8801db321c18 ffff8801d4c274e0 ffffffff839ebbad ffffffff81235627
 0000000000000000 ffff88019f3f88c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ed1af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f75d4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee8e38>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839f6502>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839f6502>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff81595001>] inode_lock_shared include/linux/fs.h:776 [inline]
 [<ffffffff81595001>] lookup_slow+0x141/0x470 fs/namei.c:1645
 [<ffffffff815a1686>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a33a9>] link_path_walk+0x889/0x1200 fs/namei.c:2120
 [<ffffffff815a441d>] path_openat+0x1ad/0x3590 fs/namei.c:3533
 [<ffffffff815abac7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e29d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e57d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e57d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fca93>] 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: [<ffffffff8136679c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136679c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425fb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3762:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fac52>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821207a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/12446:
 #0:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff81595001>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff81595001>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor0/8566:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0ddf>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0ddf>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.118-g856452b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8b8fd08 ffffffff81eb4b89 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d8b8fd40
 ffffffff81ebfe87 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4b89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4b89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebfe87>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebfe1a>] 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
 [<ffffffff81366d34>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d34>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d34>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d34>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcc5c>] 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: 8559 Comm: syz-executor0 Not tainted 4.9.118-g856452b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a75fb000 task.stack: ffff8801d3d08000
RIP: 0010:[<ffffffff8135ead6>] 
c [<ffffffff8135ead6>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8135ead6>] 
c [<ffffffff8135ead6>] check_kcov_mode kernel/kcov.c:68 [inline]
RIP: 0010:[<ffffffff8135ead6>] 
c [<ffffffff8135ead6>] __sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801d3d0f240  EFLAGS: 00000046
RAX: ffff8801a75fb000 RBX: ffffffff83cce7a0 RCX: ffffc90011535000
RDX: 0000000000000002 RSI: ffffffff81f1c72d RDI: ffffffff83cce7a0
RBP: ffff8801d3d0f240 R08: ffff8801a75fb960 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10034ebf727 R12: ffff8801b9198930
R13: dffffc0000000000 R14: ffff8801b9198930 R15: 000000000000000f
FS:  00007f75a8b51700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f98569ec140 CR3: 000000019ee7b000 CR4: 00000000001606f0
DR0: ffffffffffffffff DR1: 00000000200001c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801d3d0f258
c ffffffff81f1c72d
c 000000000000000f
c ffff8801d3d0f2a8
c
 ffffffff81624715
c 0000020006f41e80
c 0000000000000041
c ffff8801cbf92e00
c
 0000000000000001
c ffffea0006f41e9c
c ffffea0006f41e80
c 0000000000000200
c
Call Trace:
 [<ffffffff81f1c72d>] __this_cpu_preempt_check+0xd/0x20 lib/smp_processor_id.c:62
 [<ffffffff81624715>] lookup_bh_lru fs/buffer.c:1327 [inline]
 [<ffffffff81624715>] __find_get_block+0x75/0x4c0 fs/buffer.c:1356
 [<ffffffff816256e9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816256e9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff8162908d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b78a8>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b78a8>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818bf6a7>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818bf6a7>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d9c14>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818da3f1>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159b4fd>] lookup_open+0x63d/0x1930 fs/namei.c:3203
 [<ffffffff815a5168>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a5168>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815abac7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e29d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e5c0>] SYSC_openat fs/open.c:1099 [inline]
 [<ffffffff8156e5c0>] SyS_openat+0x30/0x40 fs/open.c:1093
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fca93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<83> 
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c