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rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10500 ticks this GP) idle=b59/1/0x4000000000000000 softirq=21031/21031 fqs=3055 (t=10500 jiffies g=24205 q=2608) NMI backtrace for cpu 0 CPU: 0 PID: 7361 Comm: syz.4.338 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <IRQ> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline] rcu_pending kernel/rcu/tree.c:3936 [inline] rcu_sched_clock_irq+0x6ea/0x1120 kernel/rcu/tree.c:2619 update_process_times+0x193/0x200 kernel/time/timer.c:2021 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4ad/0xb70 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:validate_xmit_skb+0x797/0xe40 net/core/dev.c:3763 Code: f7 31 f6 e8 eb 83 f9 ff 48 8b 5c 24 40 48 8d bb e8 01 00 00 be 08 00 00 00 e8 55 60 db f9 f0 48 ff 83 e8 01 00 00 31 c0 eb 1c <e8> c4 52 96 f9 eb 05 e8 bd 52 96 f9 4c 89 f7 4c 89 ee 48 8b 54 24 RSP: 0018:ffffc90000007660 EFLAGS: 00000287 RAX: ffffffff87e2ce62 RBX: 0000000000000200 RCX: ffff8880754dd940 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000060 RBP: ffffc90000007750 R08: ffff8880754dd940 R09: 0000000000000002 R10: 0000000000004888 R11: 0000000000000100 R12: dffffc0000000000 R13: 000061164fdd19e9 R14: ffff888063ccec80 R15: 0000000000000000 __dev_queue_xmit+0x13e0/0x2fd0 net/core/dev.c:4292 hsr_xmit net/hsr/hsr_forward.c:340 [inline] hsr_forward_do net/hsr/hsr_forward.c:431 [inline] hsr_forward_skb+0xfd2/0x1700 net/hsr/hsr_forward.c:584 send_hsr_supervision_frame+0x5f7/0xb80 net/hsr/hsr_device.c:349 hsr_announce+0x168/0x310 net/hsr/hsr_device.c:405 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:futex_wake+0x0/0x540 kernel/futex/core.c:1662 Code: fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 78 fe ff ff 4c 89 ff e8 1e 3e 51 00 e9 6b fe ff ff e8 44 32 0c 00 0f 0b 66 90 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00 RSP: 0018:ffffc9000336fc78 EFLAGS: 00000287 RAX: ffffffff816ce18d RBX: 0000000000000000 RCX: 00000000ffffffff RDX: 00000000000f4240 RSI: 0000000000000000 RDI: 00007fbb84c7f09c RBP: ffffc9000336fe08 R08: ffff8880754dd940 R09: 000000000000000d R10: 000000000000000d R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 do_futex+0xd73/0x12b0 kernel/futex/core.c:3987 __do_sys_futex kernel/futex/core.c:4059 [inline] __se_sys_futex+0x389/0x420 kernel/futex/core.c:4040 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbb84a05799 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:00007fbb82c3e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fbb84c7f098 RCX: 00007fbb84a05799 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbb84c7f09c RBP: 00007fbb84c7f090 R08: 0020169a535eab24 R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb84c7f128 R14: 00007ffdc308ae50 R15: 00007ffdc308af38 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026/03/01 03:32 | linux-5.15.y | 3330a8d33e08 | 43249bac | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in hsr_announce | ||
| 2026/01/22 02:24 | linux-5.15.y | 9eec9a14ee10 | 8fc37797 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in hsr_announce | ||
| 2026/01/18 15:07 | linux-5.15.y | 68efe5a6c16a | 20d37d28 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in hsr_announce | ||
| 2026/01/01 18:57 | linux-5.15.y | 68efe5a6c16a | d6526ea3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in hsr_announce | ||
| 2025/12/30 04:30 | linux-5.15.y | 68efe5a6c16a | d6526ea3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in hsr_announce |