rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=155937, q=198 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295087762-4295077260), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g155937 f0x2 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:27168 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 25758 Comm: syz.5.4325 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:lock_release+0xa1/0x3b0 kernel/locking/lockdep.c:5885
Code: 92 41 83 bf 2c 0b 00 00 00 0f 85 18 02 00 00 49 81 3e c0 73 63 93 0f 84 0b 02 00 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 <48> 8b 5c 24 20 fa 48 c7 c7 0e cb 9a 8d e8 7d 30 bf 09 65 ff 05 a6
RSP: 0018:ffffc90000a08c08 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffffff89741ce8 RCX: e5f1febebf316000
RDX: 0000000000010000 RSI: ffffffff8be07940 RDI: ffffffff8be07900
RBP: 0000000000000001 R08: ffff88807da6519f R09: 1ffff1100fb4ca33
R10: dffffc0000000000 R11: ffffed100fb4ca34 R12: ffff88807da65320
R13: ffffffff89741ce8 R14: ffffffff8e13f2e0 R15: ffff888026493d00
FS:  00007fc5d49b66c0(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005440 CR3: 00000000530b6000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 advance_sched+0xb23/0xc90 net/sched/sch_taprio.c:993
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 44 41 01 11 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000be5f698 EFLAGS: 00000206
RAX: e5f1febebf316000 RBX: 0000000000000000 RCX: e5f1febebf316000
RDX: 0000000000000001 RSI: ffffffff8db7ed49 RDI: ffffffff8be07960
RBP: ffffffff823d2176 R08: 0000000000000002 R09: ffffffff95c08db8
R10: 00000000742c29d4 R11: 0000000046935b0c R12: 0000000000000001
R13: ffff88801c2c8940 R14: 0000000000000001 R15: 0000000000000246
 down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537
 inode_lock_shared include/linux/fs.h:1043 [inline]
 lookup_slow+0x46/0x70 fs/namei.c:1874
 walk_component fs/namei.c:2221 [inline]
 lookup_last fs/namei.c:2722 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2746
 filename_lookup+0x212/0x570 fs/namei.c:2775
 kern_path+0x35/0x50 fs/namei.c:2987
 tomoyo_mount_acl security/tomoyo/mount.c:136 [inline]
 tomoyo_mount_permission+0x776/0x970 security/tomoyo/mount.c:237
 security_sb_mount+0xec/0x350 security/security.c:1062
 path_mount+0xbc/0xff0 fs/namespace.c:3964
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5d678f749
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:00007fc5d49b6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc5d69e6180 RCX: 00007fc5d678f749
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000005440
RBP: 00007fc5d6813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5d69e6218 R14: 00007fc5d69e6180 R15: 00007fffd7d9d0f8
 </TASK>