watchdog: BUG: soft lockup - CPU#0 stuck for 118s! [syz.0.188:6608] Modules linked in: irq event stamp: 10918319 hardirqs last enabled at (10918318): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (10918319): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (1295630): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (1295630): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (1295630): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (1295635): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1295635): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1295635): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6608 Comm: syz.0.188 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:unwind_next_frame+0x484/0x23c0 arch/x86/kernel/unwind_orc.c:520 Code: d2 84 c0 48 0f 45 d1 48 89 15 b8 83 ab 11 48 85 d2 0f 84 40 02 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 66 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f RSP: 0018:ffffc90000007458 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffffffff9029c334 RCX: ffffffff9029c338 RDX: ffffffff90a5d134 RSI: ffffffff90a5d134 RDI: ffffffff8c27a420 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e7602e0 R10: ffffc900000071e0 R11: ffffffffa02019cc R12: ffffffff90a5d138 R13: ffffffff90a5d139 R14: ffffc90000007528 R15: ffffffff9029c334 FS: 00007f4f003346c0(0000) GS:ffff888125466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0605578e80 CR3: 000000003428c000 CR4: 00000000003526f0 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837 dst_alloc+0x105/0x170 net/core/dst.c:90 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x440 net/ipv6/route.c:3335 ndisc_send_skb+0x42d/0x14e0 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4042 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7234 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 c3 a0 e5 f5 e8 7e 2c 1f f6 fb bf 01 00 00 00 53 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 54 2e 1f f6 bf 01 RSP: 0018:ffffc900037a7450 EFLAGS: 00000206 RAX: 000000000013c511 RBX: ffff888052190000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8def196a RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:debug_lockdep_rcu_enabled+0x29/0x40 kernel/rcu/update.c:321 Code: 90 f3 0f 1e fa 31 c0 83 3d b3 5b 64 04 00 74 1d 83 3d aa 8d 64 04 00 74 14 65 48 8b 0d e8 87 6e 07 31 c0 83 b9 14 0b 00 00 00 <0f> 94 c0 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc900037a7570 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff90a4e401 RCX: ffff888052190000 RDX: ffffc900037a7601 RSI: dffffc0000000000 RDI: ffffc900037a76b0 RBP: dffffc0000000000 R08: ffffc900037a7730 R09: 0000000000000000 R10: ffffc900037a76f8 R11: fffff520006f4ee1 R12: ffffc900037a7740 R13: ffffc900037a0000 R14: ffffc900037a76a8 R15: ffffffff81767a45 rcu_read_unlock include/linux/rcupdate.h:879 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1a5d/0x23c0 arch/x86/kernel/unwind_orc.c:695 __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5219 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5327 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x42/0x100 mm/util.c:84 call_modprobe kernel/module/kmod.c:88 [inline] __request_module+0x2ec/0x660 kernel/module/kmod.c:173 dev_load+0x190/0x1f0 net/core/dev_ioctl.c:672 dev_ioctl+0x79f/0x1150 net/core/dev_ioctl.c:811 sock_do_ioctl+0x23e/0x320 net/socket.c:1268 sock_ioctl+0x5c6/0x7f0 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4eff39c629 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:00007f4f00334028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4eff615fa0 RCX: 00007f4eff39c629 RDX: 0000200000002280 RSI: 0000000000008914 RDI: 000000000000004b RBP: 00007f4eff432b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4eff616038 R14: 00007f4eff615fa0 R15: 00007ffedd98c998 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6606 Comm: syz.3.187 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x10/0xb0 kernel/rcu/tree.c:752 Code: 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 a0 fa 70 11 0b 87 02 0a 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df RSP: 0018:ffffc90000a07e80 EFLAGS: 00000002 RAX: ffffffff81d14b78 RBX: 0000000000000000 RCX: 0000000000010100 RDX: ffff888054d20000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000a07fb8 R08: ffffffff81d14b42 R09: ffffffff8e7602e0 R10: 3e2d735f5f5f5f26 R11: 746e756f63716573 R12: 0000000000000001 R13: dffffc0000000000 R14: 1ffff92000140fe4 R15: ffffffff8e62c240 FS: 00007f28f8d066c0(0000) GS:ffff888125566000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb052d3e9c CR3: 000000007bfbc000 CR4: 00000000003526f0 Call Trace: rcu_read_lock include/linux/rcupdate.h:851 [inline] trace_call_bpf+0x10f/0xb70 kernel/trace/bpf_trace.c:144 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11301 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x345/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73 ktime_get+0x45/0x200 kernel/time/timekeeping.c:824 clockevents_program_event+0xe8/0x350 kernel/time/clockevents.c:326 hrtimer_interrupt+0xb08/0x1010 kernel/time/hrtimer.c:1924 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:perf_trace_buf_alloc+0xb5/0x280 kernel/trace/trace_event_perf.c:415 Code: 01 00 00 e8 5d 13 f6 ff 4c 89 3c 24 4d 69 ff a8 00 00 00 e8 5d b3 dd 09 41 89 c5 41 89 c4 bf 08 00 00 00 89 c6 e8 7b 17 f6 ff <41> 83 fd 07 0f 87 9d 01 00 00 e8 2c 13 f6 ff 49 bd 00 00 00 00 00 RSP: 0018:ffffc90000a08460 EFLAGS: 00000246 RAX: ffffffff81cf7955 RBX: 000000000000002c RCX: 0000000000000100 RDX: ffff888054d20000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000a083e0 R11: ffffffffa02019cc R12: 0000000000000001 R13: 0000000000000001 R14: ffffc90000a08500 R15: 00000000000000a8 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x1a5/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] is_bpf_text_address+0x47/0x2b0 kernel/bpf/core.c:748 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4882 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 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+0x395/0x6d0 net/ipv6/addrconf.c:4042 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:__schedule+0x158d/0x5340 kernel/sched/core.c:6864 Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 09 b0 81 f6 4c 89 2b 4c 89 e7 4c 89 ee e8 3b 52 85 f5 48 89 c7 e8 a3 ee e6 f5 <31> ff 4d 39 ec 40 0f 95 c7 e8 c5 f7 e6 f5 48 8b 84 24 d8 00 00 00 RSP: 0018:ffffc900035a6a60 EFLAGS: 00000206 RAX: 00000000005c80c5 RBX: ffff8880b873adc8 RCX: 0000000080000001 RDX: 0000000000000006 RSI: ffffffff8def196a RDI: ffffffff8c27a480 RBP: ffffc900035a6c50 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff888054d20000 R13: ffff888054d20000 R14: dffffc0000000000 R15: 1ffff110170e75b3 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x106/0x150 kernel/locking/lockdep.c:5945 Code: 18 00 00 b8 ff ff ff ff 65 0f c1 05 04 d0 6e 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4b e3 02 00 cc 90 0f 0b 90 48 c7 RSP: 0018:ffffc900035a6d80 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000000000000 RSI: ffffffff8e161e99 RDI: ffffffff8c27a480 RBP: 00000000ffffffff R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: 0000000000000246 R13: ffff888054d20000 R14: ffffffff8e760340 R15: 0000000000000001 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0x37/0x4d0 kernel/sched/core.c:8846 unregister_sysctl_table+0x1e/0x60 fs/proc/proc_sysctl.c:1536 __devinet_sysctl_unregister net/ipv4/devinet.c:2700 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2728 [inline] inetdev_destroy net/ipv4/devinet.c:334 [inline] inetdev_event+0x770/0x1610 net/ipv4/devinet.c:1655 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] unregister_netdevice_many_notify+0x186a/0x2370 net/core/dev.c:12403 rtnl_delete_link net/core/rtnetlink.c:3528 [inline] rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3570 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f28f7d9c629 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:00007f28f8d06028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f28f8015fa0 RCX: 00007f28f7d9c629 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 000000000000000c RBP: 00007f28f7e32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f28f8016038 R14: 00007f28f8015fa0 R15: 00007ffc7fa839d8