rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4233/1:b..l
	(detected by 0, t=10502 jiffies, g=6181, q=108)
task:syz-executor312 state:R  running task     stack:27152 pid: 4233 ppid:  4209 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_lock_acquire+0x0/0x30 include/linux/rcupdate.h:312
Code: 80 c1 03 38 c1 0f 8c ca fc ff ff 48 89 df e8 57 d1 0f fe 48 8b 14 24 e9 b9 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <e8> cb cc ca fd e8 c6 cc ca fd 48 c7 c7 20 c7 31 8c 31 f6 31 d2 b9
RSP: 0018:ffffc900030bf3f8 EFLAGS: 00000283
RAX: 0000000000000001 RBX: ffffffff8c8cab10 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff8880171f7080 RDI: ffffffff8c1ca440
RBP: ffffc900030bf550 R08: 0000000000000001 R09: 0000000000000002
R10: ffffc900030bf6a0 R11: ffffc900030bf820 R12: 1ffff92000617e98
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888075459780
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 ima_match_policy+0x10a/0x1960 security/integrity/ima/ima_policy.c:705
 ima_get_action+0x71/0xa0 security/integrity/ima/ima_api.c:198
 process_measurement+0x2d2/0x1ba0 security/integrity/ima/ima_main.c:228
 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533
 do_open fs/namei.c:3618 [inline]
 path_openat+0x27a8/0x2fa0 fs/namei.c:3750
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x150/0x4b0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f346740696e
RSP: 002b:00007fff73fc1c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055556c9023c0 RCX: 00007f346740696e
RDX: 0000000000080001 RSI: 00007f346746b03c RDI: ffffffffffffff9c
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff73fc1cf0
R13: 0000000000000003 R14: 00007fff73fc21f0 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10538 jiffies! g6181 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:28176 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 4230 Comm: syz-executor312 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x1110/0x1270 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x843/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ad/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f1 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc900030afa40 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: fd907470b52a5f00
RDX: 0000000000000000 RSI: ffffffff8a2b2ea0 RDI: ffffffff8a79e740
RBP: ffffc900030afb58 R08: dffffc0000000000 R09: 1ffffffff2036e1e
R10: dffffc0000000000 R11: fffffbfff2036e1f R12: ffff888077867828
R13: 1ffff92000615f54 R14: 0000000000000246 R15: dffffc0000000000
 __might_fault+0xb3/0x110 mm/memory.c:5357
 rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
 rseq_get_rseq_cs kernel/rseq.c:153 [inline]
 rseq_ip_fixup kernel/rseq.c:266 [inline]
 __rseq_handle_notify_resume+0x144/0xf80 kernel/rseq.c:314
 rseq_handle_notify_resume include/linux/sched.h:2203 [inline]
 rseq_signal_deliver include/linux/sched.h:2212 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:769 [inline]
 handle_signal arch/x86/kernel/signal.c:824 [inline]
 arch_do_signal_or_restart+0x285/0x12c0 arch/x86/kernel/signal.c:869
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f34673f0549
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff73fc21b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f34673f0549
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f34673cd990 R09: 00007f34673cd990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f346746b145
R13: 0000000000000003 R14: 00007fff73fc21f0 R15: 0000000000000000
 </TASK>