rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6066/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=13925, q=736 ncpus=2)
task:kworker/1:5     state:R  running task     stack:24616 pid:6066  ppid:2      flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x1f2/0x410 kernel/locking/lockdep.c:5758
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00
RSP: 0018:ffffc90003ab7940 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 3005c73776990200
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc63c0
RBP: ffffc90003ab7a48 R08: dffffc0000000000 R09: 1ffffffff21b4ea0
R10: dffffc0000000000 R11: fffffbfff21b4ea1 R12: 1ffff92000756f34
R13: ffffffff8cd2ff20 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 gc_worker+0x28d/0x14b0 net/netfilter/nf_conntrack_core.c:1502
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 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: rcu_preempt kthread starved for 10527 jiffies! g13925 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:26920 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6223 Comm: syz.1.116 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:51 [inline]
RIP: 0010:__fpu_restore_sig arch/x86/kernel/fpu/signal.c:348 [inline]
RIP: 0010:fpu__restore_sig+0x970/0x10e0 arch/x86/kernel/fpu/signal.c:493
Code: f9 ff ff 4c 03 7c 24 08 4c 89 f8 e8 5a 74 30 09 49 89 c7 89 54 24 18 41 be ff ff ff ff 48 89 c6 4c 21 f6 31 ff e8 70 37 54 00 <4d> 21 f7 74 0a e8 26 33 54 00 e9 6e f8 ff ff bf 45 58 50 46 44 8b
RSP: 0018:ffffc90003307b40 EFLAGS: 00000293
RAX: ffffffff813157c0 RBX: 0000000000000000 RCX: ffff888022493c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003307cf0 R08: ffffc90003307c7f R09: 1ffff92000660f8f
R10: dffffc0000000000 R11: fffff52000660f90 R12: 1ffff92000660f74
R13: 00007f04a3dbfd00 R14: 00000000ffffffff R15: 0000000000000000
FS:  00007f04a3dc06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000246f9000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 restore_sigcontext arch/x86/kernel/signal_64.c:95 [inline]
 __ia32_sys_rt_sigreturn+0x65d/0x7b0 arch/x86/kernel/signal_64.c:266
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f04a2f8eec9
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:00007f04a3dc00e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f04a31e5fa8 RCX: 00007f04a2f8eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f04a31e5fa8
RBP: 00007f04a31e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f04a31e6038 R14: 00007ffeb69bc110 R15: 00007ffeb69bc1f8
 </TASK>