rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...0: (0 ticks this GP) idle=2e14/1/0x4000000000000000 softirq=35362/35362 fqs=1977 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 0 0 0 ==> 52500(ms) rcu: (detected by 0, t=10504 jiffies, g=32341, q=376778 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2940 Comm: kworker/u8:6 Not tainted 6.13.0-syzkaller-01005-gb9d8a295ed6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:570 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:1117 [inline] RIP: 0010:trace_lock_acquire+0x28/0x1f0 include/trace/events/lock.h:24 Code: 90 90 41 56 41 55 55 53 48 83 ec 18 66 90 49 c7 c5 4c d9 03 00 65 41 8b 5d 00 83 fb 07 0f 87 60 01 00 00 89 db be 08 00 00 00 <48> 89 d8 48 c1 e8 06 48 8d 3c c5 10 a5 60 90 e8 44 f3 86 00 48 0f RSP: 0018:ffffc90000a18c58 EFLAGS: 00000097 RAX: 0000000000010003 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9aa95aa8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000 R13: 000000000003d94c R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555571c81808 CR3: 0000000035e8c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x2f/0xb0 kernel/locking/lockdep.c:5820 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 debug_object_activate+0x149/0x4a0 lib/debugobjects.c:818 debug_hrtimer_activate kernel/time/hrtimer.c:428 [inline] debug_activate kernel/time/hrtimer.c:469 [inline] enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1076 __run_hrtimer kernel/time/hrtimer.c:1756 [inline] __hrtimer_run_queues+0x903/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:unwind_next_frame+0x6c/0x20c0 arch/x86/kernel/unwind_orc.c:470 Code: c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 49 8d 6d 48 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 <0f> 85 00 18 00 00 49 8b 45 48 48 89 44 24 08 49 8d 45 38 48 89 c2 RSP: 0018:ffffc9000c2576a8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 1ffff9200184aeec RSI: ffffffff8906264f RDI: ffffc9000c257718 RBP: ffffc9000c257760 R08: ffffc9000c25774c R09: ffffffff9100b68c R10: ffffc9000c257718 R11: 000000000000f271 R12: ffffffff8185e030 R13: ffffc9000c257718 R14: 0000000000000000 R15: ffff8880314b8000 arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_node_track_caller_noprof+0x222/0x510 mm/slub.c:4317 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1323 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x2af/0xd00 drivers/net/netdevsim/dev.c:851 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244