rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=13565, q=546 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294959551-4294949049), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g13565 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:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </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 PID: 6019 Comm: syz.0.25 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:trace_hardirqs_on+0x0/0x40 kernel/trace/trace_preemptirq.c:55
Code: 89 de 31 d2 e8 f1 f7 ff ff 65 ff 0d 42 c5 77 7e 0f 85 39 ff ff ff e8 8f a9 74 ff e9 2f ff ff ff 0f 0b eb 80 66 0f 1f 44 00 00 <f3> 0f 1e fa 65 8b 05 4d 55 77 7e 85 c0 74 14 48 8b 3c 24 e8 08 ff
RSP: 0018:ffffc900048df980 EFLAGS: 00000002
RAX: 0000000080000001 RBX: 0000000000000000 RCX: acf169b8cad03b00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffffc900048df988
RBP: 0000000000000000 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f17059d66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000075d88000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_preemption_disabled+0x46/0x110 lib/smp_processor_id.c:55
Code: d4 94 75 65 8b 0d c2 d4 94 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 <5b> 41 5e 41 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24
RSP: 0018:ffffc900048dfa38 EFLAGS: 00000282
RAX: 0000000000000001 RBX: 0000000000000000 RCX: acf169b8cad03b00
RDX: 0000000000000000 RSI: ffffffff8afc6ae0 RDI: ffffffff8afc6aa0
RBP: ffffc900048dfb90 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad
R10: dffffc0000000000 R11: fffffbfff1c951ae R12: 1ffff9200091bf5c
R13: ffff88807f13e0a0 R14: 0000000000000001 R15: dffffc0000000000
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0xcb/0x410 kernel/locking/lockdep.c:5725
 __might_fault+0xc6/0x120 mm/memory.c:5946
 __clear_user arch/x86/include/asm/uaccess_64.h:167 [inline]
 clear_user arch/x86/include/asm/uaccess_64.h:191 [inline]
 copy_siginfo_to_user+0x5b/0xa0 kernel/signal.c:3374
 x64_setup_rt_frame+0x740/0xcd0 arch/x86/kernel/signal_64.c:194
 setup_rt_frame arch/x86/kernel/signal.c:223 [inline]
 handle_signal arch/x86/kernel/signal.c:267 [inline]
 arch_do_signal_or_restart+0x3fa/0x7b0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1704b8f6c7
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:00007f17059d60e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f1704de5fa8 RCX: 00007f1704b8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1704de5fa8
RBP: 00007f1704de5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1704de6038 R14: 00007ffe19ec6f60 R15: 00007ffe19ec7048
 </TASK>