rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=36553, q=26)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295011834-4295001332), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g36553 f0x2 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:27560 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8997 Comm: syz.2.995 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4709 [inline]
RIP: 0010:__lock_acquire+0x9a3/0x7c60 kernel/locking/lockdep.c:4962
Code: c0 0f 85 e9 00 00 00 41 0f b6 06 84 c0 74 0e 41 0f b6 cd 44 0f b6 e8 38 c1 44 0f 42 e9 48 8b 84 24 88 00 00 00 42 0f b6 04 00 <84> c0 0f 85 e3 00 00 00 48 ff c3 48 8b 44 24 40 48 63 00 49 83 c7
RSP: 0018:ffffc900000078a0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ffbe1d8
RBP: ffffc90000007af0 R08: dffffc0000000000 R09: fffffbfff1ff7c3c
R10: fffffbfff1ff7c3c R11: 1ffffffff1ff7c3b R12: ffff8880221c28d0
R13: 0000000000000002 R14: ffffffff8f9b0cb8 R15: ffff8880221c28d0
FS:  00007fa61d9466c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa107468920 CR3: 000000005a313000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 send_sigqueue+0xd1/0x620 kernel/signal.c:1973
 posix_timer_event kernel/time/posix-timers.c:360 [inline]
 posix_timer_fn+0x16a/0x3d0 kernel/time/posix-timers.c:386
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:__local_bh_disable_ip+0xd9/0x190 kernel/softirq.c:344
Code: 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 0f 85 9d 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 8b 05 bf fe b9 7e <25> ff ff ff 7f 39 d8 75 41 48 8b 5d 08 48 89 df e8 02 b7 14 00 85
RSP: 0018:ffffc9000340fa60 EFLAGS: 00000206
RAX: 0000000080000200 RBX: 0000000000000200 RCX: ffffffff960c4f03
RDX: ffffc9000deb2000 RSI: 0000000000000200 RDI: ffffffff812bdd55
RBP: ffffc9000340fb10 R08: dffffc0000000000 R09: ffffed100443866a
R10: ffffed100443866a R11: 1ffff11004438669 R12: 1ffff92000681f4c
R13: 1ffff110044386a9 R14: 0000000000000246 R15: dffffc0000000000
 fpregs_lock arch/x86/include/asm/fpu/api.h:70 [inline]
 copy_fpstate_to_sigframe+0x1fc/0xb90 arch/x86/kernel/fpu/signal.c:198
 get_sigframe arch/x86/kernel/signal.c:295 [inline]
 __setup_rt_frame arch/x86/kernel/signal.c:471 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:780 [inline]
 handle_signal arch/x86/kernel/signal.c:824 [inline]
 arch_do_signal_or_restart+0x67a/0x1300 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: 0033:0x7fa61f6df747
Code: ff ff 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
RSP: 002b:00007fa61d946038 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007fa61f935fa0 RCX: 00007fa61f6df749
RDX: 0000000000000005 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007fa61f763f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa61f936038 R14: 00007fa61f935fa0 R15: 00007ffcac02bfe8
 </TASK>