INFO: task syz-executor.3:9721 blocked for more than 143 seconds.
      Not tainted 5.8.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D25632  9721  15440 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 xlog_grant_head_wait+0x3a9/0xd10 fs/xfs/xfs_log.c:257
 xlog_grant_head_check+0x3c8/0x420 fs/xfs/xfs_log.c:319
 xfs_log_reserve+0x347/0xa90 fs/xfs/xfs_log.c:444
 xlog_unmount_write+0xcf/0x630 fs/xfs/xfs_log.c:834
 xfs_log_unmount_write fs/xfs/xfs_log.c:918 [inline]
 xfs_log_quiesce+0x357/0x410 fs/xfs/xfs_log.c:949
 xfs_log_unmount fs/xfs/xfs_log.c:963 [inline]
 xfs_log_mount_cancel+0x44/0xe0 fs/xfs/xfs_log.c:761
 xfs_mountfs+0x15df/0x1f30 fs/xfs/xfs_mount.c:1022
 xfs_fc_fill_super+0x91e/0x12e0 fs/xfs/xfs_super.c:1545
 get_tree_bdev+0x3ef/0x700 fs/super.c:1342
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2874 [inline]
 do_mount+0x1561/0x1fb0 fs/namespace.c:3199
 __do_sys_mount fs/namespace.c:3409 [inline]
 __se_sys_mount fs/namespace.c:3386 [inline]
 __x64_sys_mount+0x18f/0x230 fs/namespace.c:3386
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45f57a
Code: Bad RIP value.
RSP: 002b:00007f66292d0a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000050a4e0 RCX: 000000000045f57a
RDX: 00007f66292d0ae0 RSI: 0000000020000080 RDI: 00007f66292d0b00
RBP: 000000000078bf00 R08: 00007f66292d0b40 R09: 00007f66292d0ae0
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff
R13: 0000000000000c3a R14: 00000000004ce8ed R15: 00007f66292d16d4

Showing all locks held in the system:
1 lock held by khungtaskd/1135:
 #0: ffffffff89bc1140 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
1 lock held by in:imklog/6496:
 #0: ffff8880a2443870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by rs:main Q:Reg/6497:
 #0: ffff8880a79c35f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
 #1: ffff888214b52450 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2918 [inline]
 #1: ffff888214b52450 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x4cf/0x5d0 fs/read_write.c:558
1 lock held by syz-executor.3/9721:
 #0: ffff88804be0c0e0 (&type->s_umount_key#71/1){+.+.}-{3:3}, at: alloc_super+0x1ba/0xa10 fs/super.c:229

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

NMI backtrace for cpu 1
CPU: 1 PID: 1135 Comm: khungtaskd Not tainted 5.8.0-rc3-syzkaller #0
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+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd7d/0x1000 kernel/hung_task.c:295
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3860 Comm: systemd-journal Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7f43594f9cc3
Code: Bad RIP value.
RSP: 002b:00007ffcd5591958 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000562758dd1ea0 RCX: 000000000011a3c0
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000562758dd2140
RBP: 000000000011a3d0 R08: 000000000011a3d0 R09: 0000562758dd2140
R10: 00007f43595dbf1c R11: 0000000000613534 R12: 00007ffcd5591a68
R13: 00007ffcd5591a68 R14: 0000000000000002 R15: 0000562758dd23d0
FS:  00007f43598c08c0 GS:  0000000000000000