watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.7.6002:25846] Modules linked in: irq event stamp: 14500239 hardirqs last enabled at (14500238): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (14500239): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (3855248): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (3855248): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (3855248): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (3855251): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (3855251): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (3855251): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 25846 Comm: syz.7.6002 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__srcu_check_read_flavor+0x120/0x250 kernel/rcu/srcutree.c:781 Code: 80 00 00 00 85 c0 75 19 4c 89 e7 be 04 00 00 00 e8 65 7d 86 00 31 c0 f0 41 0f b1 1c 24 85 c0 74 04 39 d8 75 27 48 83 c4 10 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 42 dd 08 0a cc 90 0f 0b 90 e9 06 ff RSP: 0018:ffffc90000006c20 EFLAGS: 00000286 RAX: 0000000000000004 RBX: ffffffff931d6190 RCX: 0000000000000000 RDX: 0000000000000100 RSI: 0000000000000004 RDI: ffffffff8e7bda00 RBP: ffffffff931d6180 R08: ffffc900000068d7 R09: 0000000000000000 R10: ffffc900000068c8 R11: fffff52000000d1b R12: ffff8880b86291a0 R13: dffffc0000000000 R14: ffffffff8e7bda10 R15: 1ffffffff1cf7b42 FS: 00007fc964a2c6c0(0000) GS:ffff888125453000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8acd1e9f00 CR3: 000000009211c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: srcu_check_read_flavor include/linux/srcutree.h:374 [inline] srcu_read_unlock_fast_notrace include/linux/srcu.h:530 [inline] class_srcu_fast_notrace_destructor include/linux/srcu.h:634 [inline] __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3bc/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kfree+0x1c1/0x630 mm/slub.c:6483 ieee80211_inform_bss+0xc75/0x1160 net/mac80211/scan.c:164 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd08/0x1b70 net/wireless/scan.c:2372 cfg80211_inform_bss_data+0x266/0x3c40 net/wireless/scan.c:3226 cfg80211_inform_bss_frame_data+0x3c7/0x760 net/wireless/scan.c:3317 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364 __ieee80211_rx_handle_packet net/mac80211/rx.c:5305 [inline] ieee80211_rx_list+0x29e5/0x3710 net/mac80211/rx.c:5588 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5611 ieee80211_rx include/net/mac80211.h:5267 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 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:7238 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 a3 88 e2 f5 e8 ee 38 1c f6 fb bf 01 00 00 00 c3 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 3a 1c f6 bf 01 RSP: 0018:ffffc900061677e0 EFLAGS: 00000202 RAX: 000000000001a8e9 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000007 RSI: ffffffff8defb80a RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 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:preempt_schedule_thunk+0x22/0x30 arch/x86/entry/thunk.S:12 Code: 90 90 90 90 90 90 90 90 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 7a b4 7d 0a 41 5b 41 5a 41 59 41 58 58 59 5a 5e <5f> 5d e9 87 6a 7f 0a 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90006167908 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000296 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8defb80a RDI: ffffffff8c27d3a0 RBP: ffffc90006167910 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: ffff8880299afd30 R13: ffff8880299afd20 R14: ffffffff9a48a1a0 R15: 1ffff11005335fa6 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194 debug_object_activate+0x320/0x580 lib/debugobjects.c:853 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline] __call_rcu_common kernel/rcu/tree.c:3116 [inline] call_rcu+0x43/0x890 kernel/rcu/tree.c:3251 __slab_free+0x263/0x2b0 mm/slub.c:5573 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] __kmalloc_cache_noprof+0x2ba/0x660 mm/slub.c:5375 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] create_filter_start kernel/trace/trace_events_filter.c:2346 [inline] create_filter kernel/trace/trace_events_filter.c:2403 [inline] ftrace_profile_set_filter+0xd0/0x230 kernel/trace/trace_events_filter.c:2723 perf_event_set_filter kernel/events/core.c:12159 [inline] _perf_ioctl kernel/events/core.c:6652 [inline] perf_ioctl+0xa99/0x20c0 kernel/events/core.c:6723 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: 0033:0x7fc963b9c819 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:00007fc964a2c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc963e16090 RCX: 00007fc963b9c819 RDX: 00002000000000c0 RSI: 0000000040082406 RDI: 0000000000000009 RBP: 00007fc963c32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc963e16128 R14: 00007fc963e16090 R15: 00007fff6a1c7a38 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3409 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: bat_events batadv_tt_purge RIP: 0010:__lock_acquire+0xfb/0x2cf0 kernel/locking/lockdep.c:5141 Code: 30 40 0f 93 c6 40 20 ce 40 80 fe 01 0f 84 21 01 00 00 8b 9c 24 40 01 00 00 44 8b a4 24 30 01 00 00 89 d5 48 c7 c1 10 a4 c5 93 <48> 29 c8 48 c1 f8 03 48 be 29 5c 8f c2 f5 28 5c 8f 48 0f af f0 85 RSP: 0018:ffffc90000a07bf8 EFLAGS: 00000097 RAX: ffffffff93c5a988 RBX: 0000000000000000 RCX: ffffffff93c5a410 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff8e75e5e0 RBP: 0000000000000003 R08: 0000000000000000 R09: ffffffff8e75e5e0 R10: ffffc90000a07ed8 R11: ffffffff81b0d0f0 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125553000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e58fea078 CR3: 00000000766a8000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4873 skb_clone+0x212/0x3a0 net/core/skbuff.c:2120 deliver_clone net/bridge/br_forward.c:125 [inline] br_flood+0x8cf/0xb80 net/bridge/br_forward.c:250 br_handle_frame_finish+0x14c2/0x1bb0 net/bridge/br_input.c:229 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442 __netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6068 __netif_receive_skb_one_core net/core/dev.c:6179 [inline] __netif_receive_skb net/core/dev.c:6294 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6645 __napi_poll+0xae/0x340 net/core/dev.c:7709 napi_poll net/core/dev.c:7772 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7929 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:395 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2250 [inline] batadv_tt_purge+0x4d1/0x9e0 net/batman-adv/translation-table.c:3510 process_one_work kernel/workqueue.c:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 rescuer_thread+0x827/0x1130 kernel/workqueue.c:3583 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 5741 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:62:61:41:a6:89:06, vlan:0)