syz-executor0(10072): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(10072): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(10072): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(10072): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(10072): getblk(): executed=9 bh_count=0 bh_state=0
INFO: task syz-executor0:19365 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc6-next-20181003+ #86
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D18728 19365      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2830 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3479
 schedule+0xfe/0x460 kernel/sched/core.c:3523
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3581
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 vfat_lookup+0xf1/0x640 fs/fat/namei_vfat.c:709
 __lookup_slow+0x2b5/0x540 fs/namei.c:1671
 lookup_slow+0x57/0x80 fs/namei.c:1688
 walk_component+0x92b/0x25b0 fs/namei.c:1810
 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141
 link_path_walk fs/namei.c:2072 [inline]
 path_openat+0x270/0x5160 fs/namei.c:3533
 do_filp_open+0x255/0x380 fs/namei.c:3564
 do_sys_open+0x568/0x700 fs/open.c:1063
 __do_sys_open fs/open.c:1081 [inline]
 __se_sys_open fs/open.c:1076 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1076
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4555a0
Code: Bad RIP value.
RSP: 002b:00007fff1ccdde60 EFLAGS: 00000206 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004555a0
RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004bc2ce
RBP: 0000000000000c9b R08: 0000000000000001 R09: 00000000023d8940
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000006
R13: 0000000000091bcf R14: 0000000000000405 R15: 0000000000000000
INFO: task syz-executor0:10080 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc6-next-20181003+ #86
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D23008 10080  19365 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2830 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3479
 schedule+0xfe/0x460 kernel/sched/core.c:3523
 d_wait_lookup fs/dcache.c:2408 [inline]
 d_alloc_parallel+0x1471/0x1f40 fs/dcache.c:2490
 __lookup_slow+0x1e6/0x540 fs/namei.c:1654
 lookup_slow+0x57/0x80 fs/namei.c:1688
 walk_component+0x92b/0x25b0 fs/namei.c:1810
 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141
 link_path_walk fs/namei.c:2269 [inline]
 path_lookupat.isra.43+0xf7/0xc00 fs/namei.c:2317
 filename_lookup+0x26a/0x520 fs/namei.c:2348
 kern_path+0x33/0x40 fs/namei.c:2434
 lookup_bdev+0x10c/0x250 fs/block_dev.c:2088
 blkdev_get_by_path+0x1f/0xe0 fs/block_dev.c:1691
 mount_bdev+0x61/0x3e0 fs/super.c:1314
 ntfs_mount+0x3c/0x50 fs/ntfs/super.c:3069
 legacy_get_tree+0x131/0x460 fs/fs_context.c:718
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795
 do_new_mount fs/namespace.c:2648 [inline]
 do_mount+0x70c/0x1d90 fs/namespace.c:2974
 ksys_mount+0x12d/0x140 fs/namespace.c:3190
 __do_sys_mount fs/namespace.c:3204 [inline]
 __se_sys_mount fs/namespace.c:3201 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201
 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:00007fea24208c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457579
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008014 R11: 0000000000000246 R12: 00007fea242096d4
R13: 00000000004c28af R14: 00000000004d3c78 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 980 Comm: khungtaskd Not tainted 4.19.0-rc6-next-20181003+ #86
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+0x1d3/0x2c4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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: 2.037 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 10072 Comm: syz-executor0 Not tainted 4.19.0-rc6-next-20181003+ #86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x50 kernel/kcov.c:104
Code: 25 40 ee 01 00 65 8b 15 7c 80 84 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 00 00 <8b> 80 d4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1
RSP: 0018:ffff88018054e800 EFLAGS: 00000246
RAX: ffff880187764380 RBX: ffff8801d4fd49d8 RCX: ffffc90001b2c000
RDX: 0000000000000002 RSI: ffffffff81e0b63d RDI: ffff8801d4fd49d8
RBP: ffff88018054e800 R08: ffff880187764380 R09: ffffed00300a9c50
R10: ffffed00300a9c50 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000040 R14: 0000000000000001 R15: ffffea0006b44608
FS:  00007fea2422a700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001bc1d0000 CR4: 00000000001406f0
Call Trace:
 I_BDEV+0xd/0x20 fs/block_dev.c:53
 init_page_buffers+0x1f4/0x570 fs/buffer.c:898
 grow_dev_page fs/buffer.c:954 [inline]
 grow_buffers fs/buffer.c:1029 [inline]
 __getblk_slow fs/buffer.c:1062 [inline]
 __getblk_gfp+0xcfb/0x1030 fs/buffer.c:1351
 __bread_gfp+0x2d/0x300 fs/buffer.c:1385
 sb_bread include/linux/buffer_head.h:307 [inline]
 fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101
 fat_get_entry fs/fat/dir.c:129 [inline]
 fat_search_long+0x33b/0x1570 fs/fat/dir.c:477
 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697
 vfat_lookup+0x107/0x640 fs/fat/namei_vfat.c:711
 __lookup_slow+0x2b5/0x540 fs/namei.c:1671
 lookup_slow+0x57/0x80 fs/namei.c:1688
 walk_component+0x92b/0x25b0 fs/namei.c:1810
 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141
 link_path_walk fs/namei.c:2269 [inline]
 path_lookupat.isra.43+0xf7/0xc00 fs/namei.c:2317
 filename_lookup+0x26a/0x520 fs/namei.c:2348
 kern_path+0x33/0x40 fs/namei.c:2434
 lookup_bdev+0x10c/0x250 fs/block_dev.c:2088
 blkdev_get_by_path+0x1f/0xe0 fs/block_dev.c:1691
 mount_bdev+0x61/0x3e0 fs/super.c:1314
 ntfs_mount+0x3c/0x50 fs/ntfs/super.c:3069
 legacy_get_tree+0x131/0x460 fs/fs_context.c:718
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795
 do_new_mount fs/namespace.c:2648 [inline]
 do_mount+0x70c/0x1d90 fs/namespace.c:2974
 ksys_mount+0x12d/0x140 fs/namespace.c:3190
 __do_sys_mount fs/namespace.c:3204 [inline]
 __se_sys_mount fs/namespace.c:3201 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201
 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:00007fea24229c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457579
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008014 R11: 0000000000000246 R12: 00007fea2422a6d4
R13: 00000000004c28af R14: 00000000004d3c78 R15: 00000000ffffffff