rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P16686/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=140245, q=271 ncpus=2)
task:udevd           state:R  running task     stack:24256 pid:16686 tgid:16686 ppid:4671   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763
Code: 2b 00 74 08 4c 89 f7 e8 7a da 87 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000b1cfac0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92001639f64 RCX: 1ba6cbe656bd4500
RDX: dffffc0000000000 RSI: ffffffff8beae6e0 RDI: ffffffff8c3f9040
RBP: ffffc9000b1cfc08 R08: ffffffff934f1847 R09: 1ffffffff269e308
R10: dffffc0000000000 R11: fffffbfff269e309 R12: 1ffff92001639f60
R13: dffffc0000000000 R14: ffffc9000b1cfb20 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 mntput_no_expire+0xdf/0x850 fs/namespace.c:1399
 free_fs_struct fs/fs_struct.c:91 [inline]
 exit_fs+0xe9/0x140 fs/fs_struct.c:108
 do_exit+0xa18/0x27f0 kernel/exit.c:878
 do_group_exit+0x207/0x2c0 kernel/exit.c:1031
 __do_sys_exit_group kernel/exit.c:1042 [inline]
 __se_sys_exit_group kernel/exit.c:1040 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb34fafca90
RSP: 002b:00007ffce480dd78 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb34fafca90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000007 R09: d6dd8cfc7455fcd4
R10: 00000000ffffffff R11: 0000000000000206 R12: 00005568901e93f0
R13: 00007ffce480ddb8 R14: 0000000000000001 R15: 00005568901c2910
 </TASK>
rcu: rcu_preempt kthread starved for 10233 jiffies! g140245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:25232 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 16704 Comm: syz.4.3204 Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 50 b8 f5 48 89 df e8 f2 92 b9 f5 e8 2d 49 e3 f5 fb bf 01 00 00 00 <e8> 02 5e ab f5 65 8b 05 53 45 4c 74 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc9000b14fc70 EFLAGS: 00000282
RAX: db07cc5b103f8600 RBX: ffff8880155a2500 RCX: ffffffff94ce9903
RDX: dffffc0000000000 RSI: ffffffff8bead560 RDI: 0000000000000001
RBP: ffffc9000b14fdb0 R08: ffffffff8ff6a22f R09: 1ffffffff1fed445
R10: dffffc0000000000 R11: fffffbfff1fed446 R12: 0000000000000011
R13: 1ffff11002ab44f3 R14: ffff8880155a2798 R15: ffff8880155a2500
FS:  00007fc9da2f16c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb34feef5b0 CR3: 00000000232fa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x14d1/0x1730 kernel/signal.c:2920
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9d95799f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc9da2f10e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007fc9d9715f88 RCX: 00007fc9d95799f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc9d9715f88
RBP: 00007fc9d9715f80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc9d9715f8c
R13: 0000000000000000 R14: 00007ffe87d41ee0 R15: 00007ffe87d41fc8
 </TASK>