watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.46:6145] Modules linked in: irq event stamp: 13668457 hardirqs last enabled at (13668456): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (13668457): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (128150): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (128150): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (128150): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (128153): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (128153): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (128153): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6145 Comm: syz.1.46 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:rcu_read_unlock_special+0x87/0x520 kernel/rcu/tree_plugin.h:770 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 32 f0 ce 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000007360 EFLAGS: 00000206 RAX: d36f05789fc33900 RBX: 1ffff92000000e70 RCX: d36f05789fc33900 RDX: 0000000000000002 RSI: ffffffff8d76bd39 RDI: ffffffff8bbfc660 RBP: ffffc90000007438 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000246 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b883b700 FS: 00007f1f0d5d56c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5d875e7dac CR3: 0000000031abe000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5310 __alloc_skb+0x255/0x430 net/core/skbuff.c:679 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:finish_task_switch+0x242/0x940 kernel/sched/core.c:5114 Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 68 13 ba 09 e8 33 3e 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000b35f598 EFLAGS: 00000282 RAX: d36f05789fc33900 RBX: 0000000000000000 RCX: d36f05789fc33900 RDX: 0000000000000006 RSI: ffffffff8d76bd39 RDI: ffffffff8bbfc660 RBP: ffffc9000b35f5f0 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: ffff88802f945b80 R13: dffffc0000000000 R14: ffff88802e0fbd00 R15: ffff8880b883b358 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_schedule+0x84/0xc0 kernel/sched/core.c:7072 Code: 8b 05 00 80 2c 07 a9 ff ff ff 7f 75 15 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 2d 48 c7 04 24 0e 36 e0 45 <4a> c7 04 33 00 00 00 00 65 48 8b 05 bc 7f 2c 07 48 3b 44 24 58 75 RSP: 0018:ffffc9000b35f9e0 EFLAGS: 00000246 RAX: 1ffff11005f28b70 RBX: 1ffff9200166bf3c RCX: d36f05789fc33900 RDX: 0000000000000000 RSI: ffffffff8bbfc640 RDI: ffffffff8bbfc600 RBP: ffffc9000b35fa58 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000000 R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200166bf5c preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 smp_call_function_single+0x470/0x590 kernel/smp.c:689 task_function_call kernel/events/core.c:122 [inline] perf_install_in_context+0x593/0x8f0 kernel/events/core.c:3108 __do_sys_perf_event_open kernel/events/core.c:13816 [inline] __se_sys_perf_event_open+0x1966/0x1d90 kernel/events/core.c:13458 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1f0f38f749 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:00007f1f0d5d5038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f1f0f5e6180 RCX: 00007f1f0f38f749 RDX: affffff7ffffffff RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f1f0f413f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1f0f5e6218 R14: 00007f1f0f5e6180 R15: 00007ffe264f1308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5895 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xccf/0x12b0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 4a 94 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f5 8f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 d9 8f RSP: 0000:ffffc9000447f700 EFLAGS: 00000293 RAX: ffffffff81b5ba87 RBX: 1ffff11017108545 RCX: ffff88802daddb80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000447f880 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: ffff8880b8842a28 R13: dffffc0000000000 R14: ffff8880b893b9c0 R15: 0000000000000000 FS: 00007fb074aa4880(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e64e742350 CR3: 0000000031ca2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline] flush_tlb_mm_range+0x6b1/0x1280 arch/x86/mm/tlb.c:1472 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101 wp_page_copy mm/memory.c:3746 [inline] do_wp_page+0x1bb1/0x5810 mm/memory.c:4141 handle_pte_fault mm/memory.c:6250 [inline] __handle_mm_fault+0x10b5/0x5420 mm/memory.c:6366 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6535 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7fb0742b5dda Code: f6 44 01 08 01 74 59 48 83 61 08 fe 48 3d ff 03 00 00 76 69 49 8b 55 70 49 8d 75 60 48 39 72 18 0f 85 ba 00 00 00 66 0f ef c0 <41> 0f 11 44 24 20 49 89 54 24 10 49 89 74 24 18 4c 89 66 10 4c 89 RSP: 002b:00007ffd2f612430 EFLAGS: 00010246 RAX: 0000000000008560 RBX: 0000000000005990 RCX: 000055e64e781c40 RDX: 000055e64e7165b0 RSI: 00007fb0743f1b20 RDI: 000055e64e744f00 RBP: 00007fb0743f1ac0 R08: 0000000000005990 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000055e64e742330 R13: 00007fb0743f1ac0 R14: 0000000000005990 R15: 00007fb0743f1ac0