INFO: task syz-executor.3:5115 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:19536 pid:5115  tgid:5115  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x17df/0x4a40 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6819
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 __flush_workqueue+0x730/0x1630 kernel/workqueue.c:3617
 xfs_inodegc_wait_all fs/xfs/xfs_icache.c:465 [inline]
 xfs_inodegc_flush+0xe1/0x3e0 fs/xfs/xfs_icache.c:1912
 xfs_unmountfs+0x25/0x200 fs/xfs/xfs_mount.c:1064
 xfs_fs_put_super+0x65/0x140 fs/xfs/xfs_super.c:1136
 generic_shutdown_super+0x136/0x2d0 fs/super.c:646
 kill_block_super+0x44/0x90 fs/super.c:1680
 xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2026
 deactivate_locked_super+0xc4/0x130 fs/super.c:477
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:212
 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f637c87f0d7
RSP: 002b:00007ffd8c5d6e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f637c87f0d7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffd8c5d6ed0
RBP: 00007ffd8c5d6ed0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd8c5d7f90
R13: 00007f637c8c93b9 R14: 00000000001f8f7c R15: 000000000000000c
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4828:
 #0: ffff88802b4530a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.3/5115:
 #0: ffff888083f100e0 (&type->s_umount_key#68){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff888083f100e0 (&type->s_umount_key#68){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff888083f100e0 (&type->s_umount_key#68){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfb0/0xff0 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4510 Comm: klogd Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:entity_before kernel/sched/fair.c:558 [inline]
RIP: 0010:__entity_less kernel/sched/fair.c:789 [inline]
RIP: 0010:rb_add_augmented_cached include/linux/rbtree_augmented.h:74 [inline]
RIP: 0010:__enqueue_entity+0x1ec/0x500 kernel/sched/fair.c:828
Code: 20 6c 24 07 4d 8b 24 1e 4d 85 e4 74 68 4d 89 e6 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 05 e8 5d b1 8c 00 48 8b 6c 24 18 49 2b 6e 18 48 89 eb 48 c1 eb
RSP: 0018:ffffc90004ca76a8 EFLAGS: 00000046
RAX: 1ffff110074ae3d5 RBX: 0000000000000010 RCX: dffffc0000000000
RDX: ffff88807e0e3cb8 RSI: ffff88807e843c80 RDI: ffff88803a571ea8
RBP: ffffffffffffffff R08: ffffffff81435753 R09: 1ffffffff1f0b6e5
R10: dffffc0000000000 R11: fffffbfff1f0b6e6 R12: ffff88803a571e90
R13: 1ffff110070dc794 R14: ffff88803a571e90 R15: ffff8880386e3ca0
FS:  00007ff4b81f8380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdedf979000 CR3: 000000007e614000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 enqueue_entity+0x7f6/0x1930 kernel/sched/fair.c:5311
 enqueue_task_fair+0x171/0x8e0 kernel/sched/fair.c:6731
 enqueue_task+0x1a1/0x2f0 kernel/sched/core.c:2118
 activate_task kernel/sched/core.c:2148 [inline]
 ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3795
 ttwu_queue kernel/sched/core.c:4048 [inline]
 try_to_wake_up+0x88b/0x1470 kernel/sched/core.c:4369
 autoremove_wake_function+0x16/0x110 kernel/sched/wait.c:384
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
 sock_def_readable+0x1ea/0x450 net/core/sock.c:3353
 unix_dgram_sendmsg+0x148e/0x1f80 net/unix/af_unix.c:2172
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7ff4b835a9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd99e39038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff4b835a9b5
RDX: 0000000000000047 RSI: 000055f8267ed6d0 RDI: 0000000000000003
RBP: 000055f8267e3910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007ff4b84e8212 R14: 00007ffd99e39138 R15: 0000000000000000
 </TASK>