syz-executor0(14720): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(11730): getblk(): executed=9 bh_count=0 bh_state=0
kworker/u4:3(256): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(14720): getblk(): executed=9 bh_count=0 bh_state=0
syz-executor0(11730): getblk(): executed=9 bh_count=0 bh_state=0
INFO: task syz-executor0:14782 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc7-next-20181010+ #91
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D22552 14782  11730 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
 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577
 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0xa5/0x130 kernel/locking/rwsem.c:72
 inode_lock include/linux/fs.h:764 [inline]
 process_measurement+0xc3e/0x1bf0 security/integrity/ima/ima_main.c:205
 ima_file_check+0xe5/0x130 security/integrity/ima/ima_main.c:391
 do_last fs/namei.c:3422 [inline]
 path_openat+0x134a/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:00007f89ccfbac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579
RDX: 0000000000002761 RSI: 0000000020000200 RDI: ffffffffffffffff
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f89ccfbb6d4
R13: 00000000004c2b26 R14: 00000000004d4140 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 981 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181010+ #91
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 0 to CPUs 1:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.129 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 14720 Comm: syz-executor0 Not tainted 4.19.0-rc7-next-20181010+ #91
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x20 kernel/kcov.c:163
Code: ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 04 00 00 00 48 89 e5 48 8b 4d 08 e8 ea fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 <55> 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 c8 fe
RSP: 0018:ffff8801b95ceca0 EFLAGS: 00000046
RAX: 1ffff1002ef056d5 RBX: ffff88017782b690 RCX: ffffc90007ec0000
RDX: 0000000000040000 RSI: 00000000000316ac RDI: 0000000000000041
RBP: ffff8801b95cee38 R08: ffff8801d214c000 R09: fffff94000cf0b2e
R10: fffff94000cf0b2e R11: ffffea0006785977 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000003 R15: 00000000000316ac
FS:  00007f89ccffd700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5490d73000 CR3: 00000001bd5ff000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __getblk_slow fs/buffer.c:1058 [inline]
 __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351
 __bread_gfp+0x2d/0x310 fs/buffer.c:1385
 sb_bread include/linux/buffer_head.h:307 [inline]
 fat12_ent_bread+0x14e/0x3d0 fs/fat/fatent.c:76
 fat_ent_read+0x646/0xc10 fs/fat/fatent.c:368
 fat_free_clusters+0x31c/0xe80 fs/fat/fatent.c:565
 fat_free fs/fat/file.c:379 [inline]
 fat_truncate_blocks+0x9dd/0x1190 fs/fat/file.c:397
 fat_setattr+0x80e/0xc90 fs/fat/file.c:541
 notify_change+0xbde/0x1110 fs/attr.c:334
 do_truncate+0x1bd/0x2d0 fs/open.c:63
 handle_truncate fs/namei.c:3008 [inline]
 do_last fs/namei.c:3424 [inline]
 path_openat+0x375f/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:00007f89ccffcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579
RDX: 0000000000002761 RSI: 0000000020000200 RDI: ffffffffffffffff
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f89ccffd6d4
R13: 00000000004c2b26 R14: 00000000004d4140 R15: 00000000ffffffff