INFO: task syz.1.680:9304 blocked for more than 143 seconds.
      Tainted: G     U       L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.680       state:D stack:27080 pid:9304  tgid:9300  ppid:5836   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 wb_wait_for_completion fs/fs-writeback.c:226 [inline]
 wb_wait_for_completion+0x1a6/0x260 fs/fs-writeback.c:222
 __writeback_inodes_sb_nr+0x208/0x2b0 fs/fs-writeback.c:2808
 sync_filesystem fs/sync.c:54 [inline]
 sync_filesystem+0xbb/0x290 fs/sync.c:30
 fs_bdev_sync+0x2c/0x40 fs/super.c:1490
 blkdev_flushbuf block/ioctl.c:514 [inline]
 blkdev_common_ioctl+0x2229/0x2b60 block/ioctl.c:652
 blkdev_ioctl+0x2b5/0x6e0 block/ioctl.c:785
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e6858f7c9
RSP: 002b:00007f3e69390038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3e687e6180 RCX: 00007f3e6858f7c9
RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000007
RBP: 00007f3e68613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3e687e6218 R14: 00007f3e687e6180 R15: 00007fff1a990818
 </TASK>
INFO: task syz.1.680:9305 blocked for more than 146 seconds.
      Tainted: G     U       L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.680       state:D stack:28520 pid:9305  tgid:9300  ppid:5836   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 wb_wait_for_completion fs/fs-writeback.c:226 [inline]
 wb_wait_for_completion+0x1a6/0x260 fs/fs-writeback.c:222
 __writeback_inodes_sb_nr+0x208/0x2b0 fs/fs-writeback.c:2808
 sync_filesystem fs/sync.c:54 [inline]
 sync_filesystem+0xbb/0x290 fs/sync.c:30
 fs_bdev_sync+0x2c/0x40 fs/super.c:1490
 blkdev_flushbuf block/ioctl.c:514 [inline]
 blkdev_common_ioctl+0x2229/0x2b60 block/ioctl.c:652
 blkdev_ioctl+0x2b5/0x6e0 block/ioctl.c:785
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e6858f7c9
RSP: 002b:00007f3e6936f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3e687e6270 RCX: 00007f3e6858f7c9
RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000007
RBP: 00007f3e68613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000