INFO: task syz-executor.1:5062 blocked for more than 143 seconds.
      Not tainted 6.5.0-rc7-syzkaller-00022-ga5e505a99ca7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:20712 pid:5062  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1873/0x48f0 kernel/sched/core.c:6710
 schedule+0xc3/0x180 kernel/sched/core.c:6786
 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:192
 __writeback_inodes_sb_nr+0x2d2/0x370 fs/fs-writeback.c:2650
 sync_filesystem+0xa4/0x220 fs/sync.c:54
 generic_shutdown_super+0x6f/0x340 fs/super.c:472
 kill_block_super+0x68/0xa0 fs/super.c:1417
 kill_f2fs_super+0x303/0x3d0 fs/f2fs/super.c:4880
 deactivate_locked_super+0xa4/0x110 fs/super.c:330
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa30147de17
RSP: 002b:00007fff15a51918 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa30147de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fff15a519d0
RBP: 00007fff15a519d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff15a52a90
R13: 00007fa3014c73b9 R14: 000000000007cedc R15: 0000000000000009
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8d3295f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8d3299b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/28:
 #0: ffffffff8d329420 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
5 locks held by kworker/u4:4/76:
2 locks held by getty/4770:
 #0: ffff88814c0a8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187
1 lock held by syz-executor.1/5062:
 #0: ffff888075a0a0e0 (&type->s_umount_key#54){++++}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:360

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc7-syzkaller-00022-ga5e505a99ca7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xec2/0xf00 kernel/hung_task.c:379
 kthread+0x2b8/0x350 kernel/kthread.c:389
 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4450 Comm: syslogd Not tainted 6.5.0-rc7-syzkaller-00022-ga5e505a99ca7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:__kasan_check_write+0x0/0x20 mm/kasan/shadow.c:37
Code: e8 e5 04 d6 08 31 db eb d4 90 f3 0f 1e fa 89 f6 48 8b 0c 24 31 d2 e9 bf ea ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <f3> 0f 1e fa 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 9c ea ff ff 66 2e
RSP: 0018:ffffc9000316f878 EFLAGS: 00000256
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8ac5dc14
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000316f920
RBP: ffffc9000316f990 R08: ffff88807eb02d2f R09: 1ffff1100fd605a5
R10: dffffc0000000000 R11: ffffed100fd605a6 R12: 1ffff9200062df24
R13: dffffc0000000000 R14: ffff88807eb02d28 R15: dffffc0000000000
FS:  00007fc5c6d9c380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c14f729f0 CR3: 0000000022bb8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_long_try_cmpxchg_release include/linux/atomic/atomic-instrumented.h:4445 [inline]
 __mutex_unlock_slowpath+0x21c/0x750 kernel/locking/mutex.c:924
 __unix_dgram_recvmsg+0xcc1/0x1260 net/unix/af_unix.c:2443
 sock_recvmsg_nosec net/socket.c:1020 [inline]
 sock_recvmsg net/socket.c:1041 [inline]
 sock_read_iter+0x3ab/0x500 net/socket.c:1107
 call_read_iter include/linux/fs.h:1871 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x795/0xb00 fs/read_write.c:470
 ksys_read+0x1a0/0x2c0 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc5c6ef0b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fffc00f8b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fc5c6ef0b6a
RDX: 00000000000000ff RSI: 000055d799519950 RDI: 0000000000000000
RBP: 000055d799519910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fc5c708f3a3 R11: 0000000000000246 R12: 000055d799519982
R13: 000055d799519950 R14: 0000000000000000 R15: 00007fc5c70cda80
 </TASK>