rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 ticks this GP) idle=9bac/1/0x4000000000000000 softirq=16216/16216 fqs=3 rcu: (detected by 1, t=10506 jiffies, g=11281, q=1730 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_power_efficient gc_worker RIP: 0010:__sanitizer_cov_trace_pc+0x5d/0x70 kernel/kcov.c:235 Code: 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 RSP: 0000:ffffc90000007d38 EFLAGS: 00000006 RAX: ffffffff81af17ac RBX: 0000000000000001 RCX: ffff88801c2c9e80 RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000007e90 R08: ffff88807d3e5317 R09: 0000000000000000 R10: ffff88807d3e5300 R11: ffffed100fa7ca63 R12: ffff88807d3e5300 R13: dffffc0000000000 R14: 00000028100ffe5f R15: ffff8880b86283c0 FS: 0000000000000000(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0282025000 CR3: 000000000dd3a000 CR4: 00000000003526f0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1743 [inline] __hrtimer_run_queues+0x29c/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 49 ea 22 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0000:ffffc900000f7778 EFLAGS: 00000206 RAX: b021cdf833f51900 RBX: 0000000000000000 RCX: b021cdf833f51900 RDX: 0000000000000000 RSI: ffffffff8d979363 RDI: ffffffff8bc08360 RBP: 00000000ffffffff R08: ffffffff8f822177 R09: 1ffffffff1f0442e R10: dffffc0000000000 R11: fffffbfff1f0442f R12: 0000000000000246 R13: ffff88801c2c9e80 R14: ffffffff8df41a80 R15: 0000000000000002 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0xa6/0x610 kernel/sched/core.c:8789 gc_worker+0xbbe/0x1380 net/netfilter/nf_conntrack_core.c:1618 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246