rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10455 ticks this GP) idle=5fc4/1/0x4000000000000000 softirq=12994/13276 fqs=5220 rcu: hardirqs softirqs csw/system rcu: number: 1713780 857 0 rcu: cputime: 18623 33864 31 ==> 52500(ms) rcu: (t=10502 jiffies g=9937 q=2003 ncpus=2) CPU: 1 PID: 6017 Comm: syz.1.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__alloc_skb+0x0/0x2c0 net/core/skbuff.c:623 Code: 89 e0 48 83 e0 01 75 0a e8 7d 48 22 f9 e9 b0 fe ff ff 49 ff cc e8 70 48 22 f9 4d 89 e7 e9 a0 fe ff ff 0f 1f 84 00 00 00 00 00 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 89 cd 41 89 RSP: 0018:ffffc900001f0958 EFLAGS: 00000206 RAX: ffffffff88634a1d RBX: ffff888027440000 RCX: 00000000ffffffff RDX: 0000000000000002 RSI: 0000000000000820 RDI: 000000000000005c RBP: ffffc900001f0a10 R08: dffffc0000000000 R09: 1ffffffff21b4ea0 R10: dffffc0000000000 R11: fffffbfff21b4ea1 R12: 00000000fffffd01 R13: dffffc0000000000 R14: 000000000000005c R15: 0000000000000820 FS: 00005555906db500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561ef96a2b68 CR3: 000000001a7c2000 CR4: 00000000003506e0 Call Trace: __netdev_alloc_skb+0x10c/0x500 net/core/skbuff.c:714 netdev_alloc_skb include/linux/skbuff.h:3272 [inline] dev_alloc_skb include/linux/skbuff.h:3285 [inline] hsr_init_skb+0xdc/0x580 net/hsr/hsr_device.c:266 send_hsr_supervision_frame+0x102/0xa60 net/hsr/hsr_device.c:309 hsr_announce+0x192/0x340 net/hsr/hsr_device.c:399 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 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+0xc7/0x190 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:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 8b ca e4 f6 e8 56 4d 15 f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90003667b40 EFLAGS: 00000286 RAX: 49eb7d0098316800 RBX: 0000000000000000 RCX: 49eb7d0098316800 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001 RBP: ffffc90003667be0 R08: ffffffff8e4a836f R09: 1ffffffff1c9506d R10: dffffc0000000000 R11: fffffbfff1c9506e R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006ccf68 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:get_signal+0xbe/0x1400 kernel/signal.c:2677 Code: 88 00 f0 41 80 64 24 02 fd 49 8d 9f 68 09 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 36 f1 88 00 48 83 3b 00 <0f> 85 67 11 00 00 e8 77 99 31 00 4c 89 e7 be 08 00 00 00 e8 da f2 RSP: 0018:ffffc90003667ca8 EFLAGS: 00000282 RAX: 1ffff1100316c4ed RBX: ffff888018b62768 RCX: ffffffff8153f126 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888018b61e00 RBP: ffff888018b8f2c0 R08: ffff888018b61e07 R09: 1ffff1100316c3c0 R10: dffffc0000000000 R11: ffffed100316c3c1 R12: ffff888018b61e00 R13: ffff88801df4c0c0 R14: dffffc0000000000 R15: ffff888018b61e00 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9acdf8eec9 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:00007fff7da9e998 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000004 RBX: 00007f9ace1e5fa0 RCX: 00007f9acdf8eec9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480 RBP: 00007f9ace011f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9ace1e5fa0 R14: 00007f9ace1e5fa0 R15: 0000000000000005