syz-executor0(27568): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(27568): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(27568): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(27568): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(27568): getblk(): executed=9 bh_count=0 bh_state=0
INFO: task syz-executor0:27611 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc7-next-20181009+ #90
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D24800 27611   6082 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
 schedule+0xfe/0x460 kernel/sched/core.c:3524
 d_wait_lookup fs/dcache.c:2408 [inline]
 d_alloc_parallel+0x1478/0x1f40 fs/dcache.c:2490
 lookup_open+0x560/0x1b90 fs/namei.c:3147
 do_last fs/namei.c:3324 [inline]
 path_openat+0x2464/0x5150 fs/namei.c:3534
 do_filp_open+0x255/0x380 fs/namei.c:3564
 do_sys_open+0x568/0x700 fs/open.c:1063
 __do_sys_openat fs/open.c:1090 [inline]
 __se_sys_openat fs/open.c:1084 [inline]
 __x64_sys_openat+0x9d/0x100 fs/open.c:1084
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: Bad RIP value.
RSP: 002b:00007f7dce91ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579
RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7dce91b6d4
R13: 00000000004c2b12 R14: 00000000004d4128 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 986 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181009+ #90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x3ab lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb39/0x1050 kernel/hung_task.c:265
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.564 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 27568 Comm: syz-executor0 Not tainted 4.19.0-rc7-next-20181009+ #90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 kernel/kcov.c:101
Code: 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 48 89 e5 65 48 8b 04 25 40 ee 01 00 65 8b 15 ac 83 83 7e 81 e2 00 01 1f 00 <48> 8b 75 08 75 2b 8b 90 d0 12 00 00 83 fa 02 75 20 48 8b 88 d8 12
RSP: 0018:ffff88012b3feb60 EFLAGS: 00000046
RAX: ffff880184d3c4c0 RBX: 0000000000000000 RCX: ffffc90001e6a000
RDX: 0000000000000000 RSI: ffffffff8393c9ff RDI: ffffffff8931f5e8
RBP: ffff88012b3feb60 R08: ffff880184d3c4c0 R09: fffff94000e5aefe
R10: fffff94000e5aefe R11: ffffea00072d77f7 R12: 0000000000000000
R13: ffffffff8840f260 R14: ffffffff8815c460 R15: 000000000000042d
FS:  00007f7dce95d700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000009de980 CR3: 000000017f6ef000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 arch_local_save_flags arch/x86/include/asm/paravirt.h:756 [inline]
 check_preemption_disabled+0x94/0x200 lib/smp_processor_id.c:18
 __this_cpu_preempt_check+0x1c/0x1f lib/smp_processor_id.c:62
 lookup_bh_lru fs/buffer.c:1292 [inline]
 __find_get_block+0x183/0xf10 fs/buffer.c:1321
 __getblk_slow fs/buffer.c:1058 [inline]
 __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351
 __getblk include/linux/buffer_head.h:380 [inline]
 __breadahead+0x8c/0x160 fs/buffer.c:1361
 sb_breadahead include/linux/buffer_head.h:319 [inline]
 fat_dir_readahead fs/fat/dir.c:66 [inline]
 fat__get_entry+0x4d4/0xa40 fs/fat/dir.c:99
 fat_get_entry fs/fat/dir.c:129 [inline]
 fat_search_long+0x33b/0x1570 fs/fat/dir.c:479
 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697
 vfat_lookup+0x107/0x640 fs/fat/namei_vfat.c:711
 lookup_open+0x72e/0x1b90 fs/namei.c:3213
 do_last fs/namei.c:3324 [inline]
 path_openat+0x2464/0x5150 fs/namei.c:3534
 do_filp_open+0x255/0x380 fs/namei.c:3564
 do_sys_open+0x568/0x700 fs/open.c:1063
 __do_sys_openat fs/open.c:1090 [inline]
 __se_sys_openat fs/open.c:1084 [inline]
 __x64_sys_openat+0x9d/0x100 fs/open.c:1084
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7dce95cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579
RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7dce95d6d4
R13: 00000000004c2b12 R14: 00000000004d4128 R15: 00000000ffffffff