rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=673/1/0x4000000000000002 softirq=11107/11108 fqs=2101 (detected by 1, t=10506 jiffies, g=14349, q=1749) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5818 Comm: syz.4.423 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:irqtime_account_irq+0x5e/0x1b0 kernel/sched/cputime.c:60 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 e9 77 68 00 80 3d 42 03 9a 0d 01 0f 85 3d 01 00 00 48 c7 c3 80 77 02 00 49 03 1f fd 83 55 08 89 c7 e8 c6 f3 ff ff 49 89 c7 4c 89 e1 4c 8d 63 10 RSP: 0018:ffffc900000078e8 EFLAGS: 00000082 RAX: 1ffffffff1778504 RBX: ffff8880b9027780 RCX: 5b3d10465aef2b00 RDX: 0000000000000100 RSI: ffffffff8a59a4a0 RDI: ffffffff8a59a460 RBP: 0000000000010000 R08: dffffc0000000000 R09: fffffbfff1ad32b6 R10: fffffbfff1ad32b6 R11: 1ffffffff1ad32b5 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888020cb3b80 R15: ffffffff8bbc2820 FS: 00007fd4092536c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c351ac3 CR3: 000000005fca8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ad 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900000079e0 EFLAGS: 00000206 RAX: 5b3d10465aef2b00 RBX: 1ffff92000000f40 RCX: 5b3d10465aef2b00 RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a4c0 RBP: ffffc90000007ac0 R08: dffffc0000000000 R09: fffffbfff1ff7a38 R10: fffffbfff1ff7a38 R11: 1ffffffff1ff7a37 R12: ffffffff8c120b00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:771 [inline] hsr_announce+0x294/0x300 net/hsr/hsr_device.c:407 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x525/0x7c0 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 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 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:preempt_schedule_irq+0xac/0x150 kernel/sched/core.c:6799 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 70 bf 01 00 00 00 e8 0f f7 9f f7 e8 ea 6e cc f7 fb bf 01 00 00 00 ef b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90002feee80 EFLAGS: 00000282 RAX: 5b3d10465aef2b00 RBX: 0000000000000000 RCX: 5b3d10465aef2b00 RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000001 RBP: ffffc90002feef20 R08: dffffc0000000000 R09: fffffbfff1ff7a1b R10: fffffbfff1ff7a1b R11: 1ffffffff1ff7a1a R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005fddd0 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:lock_acquire+0x1f2/0x3f0 kernel/locking/lockdep.c:5627 Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f6 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b RSP: 0018:ffffc90002feefe0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 5b3d10465aef2b00 RDX: 0000000000000000 RSI: ffffffff8a0b2ac0 RDI: ffffffff8a59a4c0 RBP: ffffc90002fef0e8 R08: dffffc0000000000 R09: fffffbfff1ff7a1b R10: fffffbfff1ff7a1b R11: 1ffffffff1ff7a1a R12: ffffffff8c1ecd60 R13: 1ffff920005fde08 R14: 0000000000000246 R15: dffffc0000000000 fs_reclaim_acquire+0x91/0x100 mm/page_alloc.c:4597 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x20/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3139 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc_track_caller+0x69/0x330 mm/slub.c:4930 copy_array kernel/bpf/verifier.c:778 [inline] copy_verifier_state+0xd1/0xc90 kernel/bpf/verifier.c:959 push_stack+0x1a5/0x510 kernel/bpf/verifier.c:1057 check_cond_jmp_op kernel/bpf/verifier.c:9362 [inline] do_check+0xc414/0xeac0 kernel/bpf/verifier.c:11493 do_check_common+0xe67/0x16c0 kernel/bpf/verifier.c:13506 do_check_main kernel/bpf/verifier.c:13569 [inline] bpf_check+0x31f3/0xf090 kernel/bpf/verifier.c:14140 bpf_prog_load+0x1043/0x1550 kernel/bpf/syscall.c:2354 __sys_bpf+0x4c2/0x670 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 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: 0033:0x7fd40afebec9 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:00007fd409253038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd40b242fa0 RCX: 00007fd40afebec9 RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005 RBP: 00007fd40b06ef91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd40b243038 R14: 00007fd40b242fa0 R15: 00007fffc23b60f8