INFO: task syz-fuzzer:5085 blocked for more than 143 seconds.
      Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-fuzzer      state:D stack:22200 pid:5085  tgid:5064  ppid:5062   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:793 [inline]
 vfs_unlink+0xe4/0x600 fs/namei.c:4327
 do_unlinkat+0x4ae/0x830 fs/namei.c:4402
 __do_sys_unlinkat fs/namei.c:4445 [inline]
 __se_sys_unlinkat fs/namei.c:4438 [inline]
 __x64_sys_unlinkat+0xce/0xf0 fs/namei.c:4438
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x40720e
RSP: 002b:000000c000aa9688 EFLAGS: 00000206 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000011 RCX: 000000000040720e
RDX: 0000000000000000 RSI: 000000c00134f8d0 RDI: 0000000000000011
RBP: 000000c000aa96c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000018d
R13: 000000c00049d400 R14: 000000c0004a1380 R15: 000000c00134c700
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
1 lock held by klogd/4510:
2 locks held by getty/4826:
 #0: ffff88802aa250a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by syz-fuzzer/5085:
 #0: ffff88802f24a420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #1: ffff888050d31800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:828 [inline]
 #1: ffff888050d31800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x26a/0x830 fs/namei.c:4389
 #2: ffff88805fdd5e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #2: ffff88805fdd5e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xe4/0x600 fs/namei.c:4327
2 locks held by syz-executor.3/8934:
1 lock held by syz-executor.5/9475:
4 locks held by syz-executor.3/9791:
1 lock held by syz-executor.3/9793:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4503 Comm: syslogd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:mutex_lock_nested+0x4/0x20 kernel/locking/mutex.c:803
Code: 8f e8 20 64 7a f6 eb 93 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <89> f2 4c 8b 04 24 be 02 00 00 00 31 c9 eb 1d 66 2e 0f 1f 84 00 00
RSP: 0018:ffffc9000cab7958 EFLAGS: 00000246
RAX: ffffffff8a13f4bb RBX: 7fffffffffffffff RCX: ffff88807eef3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888028ee4518
RBP: ffffc9000cab7b08 R08: ffffffff8f873a6f R09: 1ffffffff1f0e74d
R10: dffffc0000000000 R11: fffffbfff1f0e74e R12: ffff888028ee40e8
R13: dffffc0000000000 R14: 1ffff92001956f4c R15: 1ffff92001956f50
FS:  00007f698933a380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001a7f000 CR3: 00000000290f6000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __unix_dgram_recvmsg+0x257/0x1450 net/unix/af_unix.c:2426
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x231/0x280 net/socket.c:1068
 sock_read_iter+0x2ca/0x3e0 net/socket.c:1138
 call_read_iter include/linux/fs.h:2102 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x97d/0xb70 fs/read_write.c:476
 ksys_read+0x1a0/0x2c0 fs/read_write.c:619
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f698948eb6a
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:00007ffde0453da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f698948eb6a
RDX: 00000000000000ff RSI: 0000557454301950 RDI: 0000000000000000
RBP: 0000557454301910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f698962d3a3 R11: 0000000000000246 R12: 00005574543019a3
R13: 0000557454301950 R14: 0000000000000000 R15: 00007f6989671a80
 </TASK>