syzbot

INFO: task syz-executor350:5072 blocked for more than 143 seconds.
      Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor350 state:D stack:22120 pid:5072  ppid:5069   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x17d8/0x4990 kernel/sched/core.c:6622
 schedule+0xc3/0x180 kernel/sched/core.c:6698
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2143
 do_wait_for_common+0x449/0x5f0 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x4a/0x60 kernel/sched/completion.c:138
 __flush_work+0x130/0x1b0 kernel/workqueue.c:3174
 nilfs_segctor_destroy fs/nilfs2/segment.c:2732 [inline]
 nilfs_detach_log_writer+0x4a4/0xbd0 fs/nilfs2/segment.c:2816
 nilfs_put_super+0x4f/0x150 fs/nilfs2/super.c:477
 generic_shutdown_super+0x134/0x340 fs/super.c:491
 kill_block_super+0x7e/0xe0 fs/super.c:1398
 deactivate_locked_super+0xa4/0x110 fs/super.c:331
 cleanup_mnt+0x490/0x520 fs/namespace.c:1177
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 ptrace_notify+0x2cd/0x380 kernel/signal.c:2354
 ptrace_report_syscall include/linux/ptrace.h:411 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline]
 syscall_exit_work kernel/entry/common.c:251 [inline]
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:278 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x17a/0x2e0 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f213aa39e07
RSP: 002b:00007ffead117e58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f213aa39e07
RDX: 00007ffead117f1a RSI: 000000000000000a RDI: 00007ffead117f10
RBP: 00007ffead117f10 R08: 00000000ffffffff R09: 00007ffead117cf0
R10: 00005555563eb653 R11: 0000000000000202 R12: 00007ffead118f80
R13: 00005555563eb5f0 R14: 00007ffead117e80 R15: 0000000000000024
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/7:
 #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x77f/0x13a0
 #1: ffffc900000c7d20 ((work_completion)(&sci->sc_iput_work)){+.+.}-{0:0}, at: process_one_work+0x7c6/0x13a0 kernel/workqueue.c:2365
 #2: ffff888028788650 (sb_internal#2){.+.+}-{0:0}, at: nilfs_evict_inode+0x166/0x420 fs/nilfs2/inode.c:928
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d127c70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d128470 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
 #0: ffffffff8d127aa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4748:
 #0: ffff88802d371098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177
1 lock held by syz-executor350/5072:
 #0: ffff8880287880e0 (&type->s_umount_key#43){+.+.}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:361

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e5/0x560 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x1b4/0x410 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0x1024/0x1070 kernel/hung_task.c:379
 kthread+0x270/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5407 [inline]
RIP: 0010:lock_is_held_type+0xaf/0x190 kernel/locking/lockdep.c:5712
Code: 0a 00 00 00 7e 47 4c 89 ed 48 81 c5 38 0a 00 00 31 db 48 83 fb 31 73 24 48 89 ef 4c 89 fe e8 28 02 00 00 85 c0 75 2a 48 ff c3 <49> 63 85 30 0a 00 00 48 83 c5 28 48 39 c3 7c d8 eb 11 48 c7 c7 e0
RSP: 0018:ffffc900001075f8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8d127a20 RDI: ffff8880167f44e0
RBP: ffff8880167f44e0 R08: dffffc0000000000 R09: fffffbfff1ce8fe6
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000246
R13: ffff8880167f3a80 R14: 00000000ffffffff R15: ffffffff8d127a20
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561e13f9e600 CR3: 000000000cf30000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x8d/0x130 kernel/rcu/update.c:125
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x10f/0xab0 kernel/locking/lockdep.c:5680
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:390 [inline]
 __text_poke+0x88b/0xa00 arch/x86/kernel/alternative.c:1645
 text_poke arch/x86/kernel/alternative.c:1669 [inline]
 text_poke_bp_batch+0x66f/0x950 arch/x86/kernel/alternative.c:2048
 text_poke_flush arch/x86/kernel/alternative.c:2161 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2168
 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146
 static_key_disable_cpuslocked+0xce/0x1b0 kernel/jump_label.c:235
 static_key_disable+0x1a/0x20 kernel/jump_label.c:243
 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:804
 process_one_work+0x915/0x13a0 kernel/workqueue.c:2390
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2537
 kthread+0x270/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.150 msecs