rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=16797, q=709 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294959838-4294949335), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g16797 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:28968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0xfee/0x6120 kernel/sched/core.c:6911
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7238
 irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:debug_object_free+0x0/0x550 lib/debugobjects.c:969
Code: f5 c6 da 0b 00 75 05 e9 be a0 94 06 ba 01 00 00 00 e9 d4 fb ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 49 bd 00 00 00 00 00 fc
RSP: 0018:ffffc90000157ba8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 00000000ffffb9d8 RCX: ffffffff81f45355
RDX: ffff88801e2d0000 RSI: ffffffff8bb2ba40 RDI: ffffc90000157bd0
RBP: 1ffff9200002af76 R08: 0000000000000005 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000157bd0
R13: 1ffffffff1c82250 R14: ffff88801e2d0000 R15: dffffc0000000000
 schedule_timeout+0x137/0x280 kernel/time/sleep_timeout.c:103
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6567 Comm: syz.2.36 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:write_comp_data+0x40/0x90 kernel/kcov.c:246
Code: 05 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 80 e1 8a 09 8b 87 a4 16 00 00 85 c0 74 f1 8b 87 80 16 00 00 <83> f8 03 75 e6 48 8b 87 88 16 00 00 8b bf 84 16 00 00 48 8b 30 48
RSP: 0018:ffffc90003affac8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81ae57c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888021bc24c0
RBP: ffff888021bc24c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 00007f728825e5c0 R14: ffff888021bc3ec0 R15: ffff888021bc3ec0
FS:  00007f728825f6c0(0000) GS:ffff88812443f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000056fee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_fpstate_to_sigframe+0x2c6/0xb20 arch/x86/kernel/fpu/signal.c:222
 get_sigframe+0x3fb/0x940 arch/x86/kernel/signal.c:163
 x64_setup_rt_frame+0x12f/0xce0 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
 handle_signal arch/x86/kernel/signal.c:294 [inline]
 arch_do_signal_or_restart+0x59e/0x7a0 arch/x86/kernel/signal.c:339
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f728739a337
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f728825f0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f72875d5fa8 RCX: 00007f728739a339
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f72875d5fa8
RBP: 00007f72875d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72875d6038 R14: 00007ffc0006e5b0 R15: 00007ffc0006e698
 </TASK>