INFO: task syz-executor.0:8854 blocked for more than 144 seconds.
      Not tainted 6.9.0-rc5-syzkaller-00329-g5d12ed4bea43 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27216 pid:8854  tgid:8848  ppid:8329   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
 __down_write_common+0x950/0x13f0 kernel/locking/rwsem.c:1306
 inode_lock_nested include/linux/fs.h:830 [inline]
 do_rmdir+0x235/0x410 fs/namei.c:4253
 __do_sys_rmdir fs/namei.c:4284 [inline]
 __se_sys_rmdir fs/namei.c:4282 [inline]
 __x64_sys_rmdir+0xc7/0x110 fs/namei.c:4282
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef4867dea9
RSP: 002b:00007fef4940c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007fef487ac050 RCX: 00007fef4867dea9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 00007fef486ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fef487ac050 R15: 00007ffd6a95f1b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kworker/u8:2/34:
 #0: ffff888015089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229
 #1: ffffc90000aa7d80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1ac0 kernel/workqueue.c:3230
2 locks held by getty/4833:
 #0: ffff88802a2fe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.3/7757:
 #0: ffff8880652100e0 (&type->s_umount_key#80){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880652100e0 (&type->s_umount_key#80){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880652100e0 (&type->s_umount_key#80){++++}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:504
 #1: ffff8880b943ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
2 locks held by syz-executor.0/8849:
2 locks held by syz-executor.0/8854:
 #0: ffff8880292dc420 (sb_writers#36){.+.+}-{0:0}, at: do_rmdir+0x1e4/0x410 fs/namei.c:4249
 #1: ffff8880797c8188 (&type->i_mutex_dir_key#23/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline]
 #1: ffff8880797c8188 (&type->i_mutex_dir_key#23/1){+.+.}-{3:3}, at: do_rmdir+0x235/0x410 fs/namei.c:4253
4 locks held by syz-executor.2/10412:
1 lock held by syz-executor.4/10839:
 #0: ffff88805c88d258 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{3:3}, at: pfkey_sendmsg+0x42b/0x840 net/key/af_key.c:3697

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc5-syzkaller-00329-g5d12ed4bea43 #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+0x116/0x1f0 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xf86/0x1240 kernel/hung_task.c:380
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5180 Comm: syz-fuzzer Not tainted 6.9.0-rc5-syzkaller-00329-g5d12ed4bea43 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:unwind_next_frame+0x1b66/0x23a0 arch/x86/kernel/unwind_orc.c:648
Code: 8d 44 24 03 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 fe 83 e6 07 40 38 f1 40 0f 9e c6 84 c9 0f 95 c1 40 84 ce 0f 85 1f 08 00 00 <83> e0 07 38 c2 0f 9e c1 84 d2 0f 95 c0 84 c1 0f 85 0a 08 00 00 4d
RSP: 0018:ffffc900043cf2e0 EFLAGS: 00000246
RAX: ffffffff9038b7f1 RBX: ffffc900043cf360 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff9038b7f0
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000004
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff9038b7ee
R13: ffffc900043cf760 R14: 0000000000000001 R15: 0000000000000001
FS:  000000c000fd1890(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9b9409000 CR3: 000000002dfae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:240 [inline]
 __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kmem_cache_free+0x12e/0x380 mm/slub.c:4344
 kfree_skbmem+0x1a0/0x200 net/core/skbuff.c:1180
 tcp_wmem_free_skb include/net/tcp.h:312 [inline]
 tcp_rtx_queue_unlink_and_free include/net/tcp.h:2098 [inline]
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3375 [inline]
 tcp_ack+0x1eb7/0x5ba0 net/ipv4/tcp_input.c:3967
 tcp_rcv_established+0xda1/0x21b0 net/ipv4/tcp_input.c:6079
 tcp_v4_do_rcv+0x6a9/0xa50 net/ipv4/tcp_ipv4.c:1906
 sk_backlog_rcv include/net/sock.h:1106 [inline]
 __release_sock+0x31b/0x400 net/core/sock.c:2984
 release_sock+0x5a/0x220 net/core/sock.c:3550
 tcp_sendmsg+0x38/0x50 net/ipv4/tcp.c:1343
 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x4b8/0x5c0 net/socket.c:1160
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x40720e
Code: 48 83 ec 38 e8 13 00 00 00 48 83 c4 38 5d c3 cc cc cc cc cc cc cc cc cc cc cc cc cc 49 89 f2 48 89 fa 48 89 ce 48 89 df 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d8 48 89 c1 48 c7 c0 ff ff ff ff 48
RSP: 002b:000000c0000d8d98 EFLAGS: 00000206 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000040720e
RDX: 00000000000000f0 RSI: 000000c0004fe200 RDI: 0000000000000003
RBP: 000000c0000d8dd8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 000000c0000d8f18
R13: 0000000000000001 R14: 000000c0000061a0 R15: 000000000000000f
 </TASK>