watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.2.9268:6387] Modules linked in: irq event stamp: 14077581 hardirqs last enabled at (14077580): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (14077581): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (14076778): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14076778): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14076778): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (14076781): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14076781): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14076781): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6387 Comm: syz.2.9268 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a 6b f0 f5 48 89 df e8 92 e0 f0 f5 e8 4d 3a 1c f6 fb bf 01 00 00 00 72 9d e2 f5 65 8b 05 9b df 6a 07 85 c0 74 07 5b e9 01 48 00 00 RSP: 0018:ffffc90000a08c00 EFLAGS: 00000202 RAX: 0000000000d6ce86 RBX: ffff8880b873ca78 RCX: 0000000000000102 RDX: 0000000000000002 RSI: ffffffff8def8cb4 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011b2b7 R09: 1ffffffff2023656 R10: dffffc0000000000 R11: fffffbfff2023657 R12: ffff8880b873c8d0 R13: ffff8880b873c8a8 R14: ffffffff8980adcb R15: dffffc0000000000 FS: 00007fa89cc996c0(0000) GS:ffff88812555d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c28a9dc CR3: 0000000055c58000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: spin_unlock_irq include/linux/spinlock.h:401 [inline] backlog_unlock_irq_enable net/core/dev.c:266 [inline] process_backlog+0x140c/0x1950 net/core/dev.c:6657 __napi_poll+0xae/0x340 net/core/dev.c:7692 napi_poll net/core/dev.c:7755 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7912 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:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d a4 7d 55 0c 48 89 de 5b e9 e3 95 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d c8 8d 56 11 65 8b 15 e9 8d 56 RSP: 0018:ffffc90003897638 EFLAGS: 00000246 RAX: ffffffff81b9bfbc RBX: 1ffff110170c8525 RCX: 0000000000000002 RDX: ffff888030120000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003897780 R08: ffffffff9011b2b7 R09: 1ffffffff2023656 R10: dffffc0000000000 R11: fffffbfff2023657 R12: ffff8880b8642928 R13: dffffc0000000000 R14: ffff8880b873c000 R15: 0000000000000000 csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xce1/0x12c0 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2761 [inline] smp_text_poke_batch_finish+0xb5f/0x1160 arch/x86/kernel/alternative.c:3033 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 tracepoint_add_func+0x89d/0xa50 kernel/tracepoint.c:324 tracepoint_probe_register_prio kernel/tracepoint.c:473 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:493 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:11270 perf_try_init_event+0x17f/0x870 kernel/events/core.c:13029 perf_init_event kernel/events/core.c:13127 [inline] perf_event_alloc+0x1444/0x2e30 kernel/events/core.c:13402 __do_sys_perf_event_open kernel/events/core.c:13924 [inline] __se_sys_perf_event_open+0x7a9/0x1d60 kernel/events/core.c:13805 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: 0033:0x7fa89bd9c799 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:00007fa89cc99028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fa89c015fa0 RCX: 00007fa89bd9c799 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000640 RBP: 00007fa89be32c99 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa89c016038 R14: 00007fa89c015fa0 R15: 00007ffe0dfcd528 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6378 Comm: syz.5.9266 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3801 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3821 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3876 [inline] RIP: 0010:__lock_acquire+0xb17/0x2cf0 kernel/locking/lockdep.c:5237 Code: 6d 73 0e 48 c7 c6 dc 65 01 8e 67 48 0f b9 3a 90 48 bb eb 83 b5 80 46 86 c8 61 48 0f af dd 48 c1 eb 2d 48 8b 04 dd 40 04 e0 93 <48> 85 c0 0f 94 c1 48 83 c0 f8 0f 94 c2 08 ca 0f 84 1c 01 00 00 e8 RSP: 0018:ffffc90000006ad8 EFLAGS: 00000803 RAX: ffffffff94242178 RBX: 0000000000068a08 RCX: 0000000000040000 RDX: 000000002d2c0ffc RSI: 0000000048091cc7 RDI: ffff888025749e80 RBP: 35a08aec8a9222e9 R08: ffffffff81b267fa R09: ffff8880b8628298 R10: dffffc0000000000 R11: ffffffff81b26700 R12: ffff88802574aa78 R13: ffff88802574aa78 R14: ffff888025749e80 R15: 0000000000000004 FS: 00007f01eb6086c0(0000) GS:ffff88812545d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f831a8da080 CR3: 000000009dd34000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 hrtimer_interrupt+0xfa/0x1010 kernel/time/hrtimer.c:1892 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:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 45 25 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c1 a2 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d fe 78 73 RSP: 0018:ffffc90000006ed0 EFLAGS: 00000292 RAX: 81033d74cd284600 RBX: 0000000000000246 RCX: 0000000000000303 RDX: 00000000dbf0134a RSI: ffffffff8e1699c5 RDI: ffffffff8c27c900 RBP: 0000000000000001 R08: ffffffff82240fc8 R09: ffff8880b863f4f8 R10: ffffc900000070c0 R11: fffff52000000e20 R12: 0000000000000000 R13: ffff8880b863f4f8 R14: 0000000000000000 R15: 0000000000000001 local_trylock_acquire include/linux/local_lock_internal.h:53 [inline] alloc_from_pcs mm/slub.c:4711 [inline] slab_alloc_node mm/slub.c:4851 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x1d4/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] ieee802_11_parse_elems_full+0x159/0x2ab0 net/mac80211/parse.c:1051 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2480 [inline] ieee80211_inform_bss+0x161/0x1160 net/mac80211/scan.c:79 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 e3 07 e4 f5 e8 4e a6 1d f6 fb bf 01 00 00 00 c3 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 24 a8 1d f6 bf 01 RSP: 0018:ffffc90004156b40 EFLAGS: 00000206 RAX: 0000000000cc7487 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000006 RSI: ffffffff8def8cb4 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011b2b7 R09: 1ffffffff2023656 R10: dffffc0000000000 R11: fffffbfff2023657 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_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:preempt_schedule+0x4/0x30 kernel/sched/core.c:7117 Code: 0a e4 f5 e9 3e b6 01 00 cc 66 66 66 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 <65> 8b 05 a5 4d 6c 07 a9 ff ff ff 7f 75 09 9c 58 a9 00 02 00 00 75 RSP: 0018:ffffc90004156c68 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88801b6dd918 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000ffffffff RBP: ffffc90004156cb8 R08: ffff88808d2edbab R09: 1ffff11011a5db75 R10: dffffc0000000000 R11: ffffed1011a5db76 R12: ffff88801b6dd920 R13: dffffc0000000000 R14: ffff88801b6dd920 R15: 1ffff110036dbb24 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __up_write kernel/locking/rwsem.c:1388 [inline] up_write+0x1d9/0x410 kernel/locking/rwsem.c:1643 kernfs_remove_by_name_ns+0xe8/0x130 fs/kernfs/dir.c:1726 kernfs_remove_by_name include/linux/kernfs.h:633 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xfc/0x2e0 fs/sysfs/group.c:328 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352 device_remove_groups drivers/base/core.c:2844 [inline] device_remove_attrs+0x229/0x280 drivers/base/core.c:2980 device_del+0x51f/0x8f0 drivers/base/core.c:3879 unregister_netdevice_many_notify+0x1e0e/0x2370 net/core/dev.c:12449 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+0x972/0x9f0 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: 0033:0x7f01ea79c799 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:00007f01eb608028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f01eaa15fa0 RCX: 00007f01ea79c799 RDX: 0000000024000000 RSI: 00002000000001c0 RDI: 0000000000000007 RBP: 00007f01ea832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f01eaa16038 R14: 00007f01eaa15fa0 R15: 00007ffc72fd7518