syzbot

INFO: task syz.4.51:3882 blocked for more than 143 seconds.
      Not tainted 6.1.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.51        state:D stack:24136 pid:3882  ppid:3645   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 perf_pending_task_sync kernel/events/core.c:5029 [inline]
 _free_event+0x169/0x1090 kernel/events/core.c:5035
 put_event kernel/events/core.c:5160 [inline]
 perf_event_release_kernel+0x873/0x900 kernel/events/core.c:5285
 perf_release+0x37/0x40 kernel/events/core.c:5295
 __fput+0x3f6/0x8d0 fs/file_table.c:320
 task_work_run+0x246/0x300 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xa73/0x26a0 kernel/exit.c:871
 do_group_exit+0x202/0x2b0 kernel/exit.c:1021
 get_signal+0x16f7/0x17d0 kernel/signal.c:2870
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f513197df39
RSP: 002b:00007f513274dfe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: fffffffffffffff2 RBX: 00007f5131b35f80 RCX: 00007f513197df39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000022023400
RBP: 00007f51319f0216 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5131b35f80 R15: 00007ffed856b948
 </TASK>

Showing all locks held in the system:
1 lock held by kworker/u4:1/11:
 #0: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d32b1d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d32b9d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
 #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3402:
 #0: ffff88814ba36098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
3 locks held by udevd/4952:

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1ae/0x3f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf88/0xfd0 kernel/hung_task.c:377
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5839 Comm: syz-executor Not tainted 6.1.111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:arch_static_branch include/trace/events/preemptirq.h:40 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:trace_irq_enable_rcuidle+0x1/0x140 include/trace/events/preemptirq.h:40
Code: 75 0b 48 8b 3c 24 31 f6 e8 1c 00 00 00 65 c7 05 e9 c2 71 7e 00 00 00 00 e8 2c d8 d8 ff 48 8b 3c 24 e9 23 69 15 09 0f 1f 00 55 <41> 57 41 56 41 54 53 66 90 5b 41 5c 41 5e 41 5f 5d c3 49 89 f6 48
RSP: 0018:ffffc9000e767b18 EFLAGS: 00000046
RAX: 0000000080000001 RBX: ffff888056c7b780 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8ab1401f
RBP: ffffc9000e767c70 R08: dffffc0000000000 R09: ffffed100ad8f6f1
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100ad8f743
R13: 0000000004000000 R14: 0000000000000011 R15: ffff888056c7ba18
FS:  0000555555b46500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a8adddf40 CR3: 0000000079d72000 CR4: 00000000003506f0
DR0: 0000000020000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
 _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x154b/0x17d0 kernel/signal.c:2873
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efcdaf747cd
Code: 8b 04 25 10 00 00 00 be 18 00 00 00 48 8d b8 e0 02 00 00 66 48 0f 6e c7 66 0f 6c c0 0f 11 80 d8 02 00 00 b8 11 01 00 00 0f 05 <89> d0 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 ba ff ff ff ff 89 d0
RSP: 002b:00007ffc405a9508 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efcdaf747cd
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000555555b467e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555555b467d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000037348 R14: 000000000003729e R15: 00007ffc405a9690
 </TASK>