rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=6724/1/0x4000000000000000 softirq=30707/30711 fqs=5242 rcu: hardirqs softirqs csw/system rcu: number: 1382463 0 0 rcu: cputime: 18653 33835 67 ==> 52520(ms) rcu: (t=10503 jiffies g=36789 q=2999 ncpus=2) CPU: 0 PID: 9428 Comm: syz.0.1104 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234 Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 40 8a 7c 7e 65 8b RSP: 0018:ffffc90000007370 EFLAGS: 00000246 RAX: ffffffff813b6419 RBX: ffffffff8f1a4163 RCX: ffff888030000000 RDX: 0000000000000100 RSI: ffffc90000007818 RDI: ffffc900000074a8 RBP: dffffc0000000000 R08: ffff888030000000 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900000074a8 R13: dffffc0000000000 R14: ffffffff8f1a4162 R15: ffffc900000074a8 FS: 00007f78b30dc6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe26e7ea540 CR3: 0000000048d4d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: deref_stack_reg+0x29/0x240 arch/x86/kernel/unwind_orc.c:402 unwind_next_frame+0x1789/0x2970 arch/x86/kernel/unwind_orc.c:648 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 __netdev_alloc_skb+0x10c/0x500 net/core/skbuff.c:717 netdev_alloc_skb include/linux/skbuff.h:3304 [inline] dev_alloc_skb include/linux/skbuff.h:3317 [inline] hsr_init_skb+0xdc/0x580 net/hsr/hsr_device.c:266 send_hsr_supervision_frame+0x140/0xb90 net/hsr/hsr_device.c:309 hsr_announce+0x198/0x350 net/hsr/hsr_device.c:402 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:generic_exec_single+0x481/0x4f0 kernel/smp.c:418 Code: 75 11 e8 c2 06 0b 00 48 85 db 75 16 e8 b8 06 0b 00 eb 15 e8 b1 06 0b 00 e8 9c 36 0c 09 48 85 db 74 ea e8 a2 06 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08 RSP: 0018:ffffc900104dfa00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc9000cc29000 RSI: 0000000000003ab8 RDI: 0000000000003ab9 RBP: ffffc900104dfad0 R08: ffffffff911cd5ff R09: 1ffffffff2239abf R10: dffffc0000000000 R11: fffffbfff2239ac0 R12: 1ffff9200209bf44 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200209bf65 smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5be/0x920 kernel/events/core.c:2959 __do_sys_perf_event_open kernel/events/core.c:12957 [inline] __se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f78b219ce59 Code: 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 01 48 RSP: 002b:00007f78b30dc028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f78b2415fa0 RCX: 00007f78b219ce59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007f78b2232d6f R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f78b2416038 R14: 00007f78b2415fa0 R15: 00007ffe34e98848