watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.1.106:6303] Modules linked in: irq event stamp: 12824897 hardirqs last enabled at (12824896): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (12824897): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (53698): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (53698): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (53698): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (53701): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (53701): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (53701): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6303 Comm: syz.1.106 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:strlen+0x29/0x70 lib/string.c:420 Code: 90 f3 0f 1e fa 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 RSP: 0018:ffffc90000a07618 EFLAGS: 00000a03 RAX: 1ffffffff175bf68 RBX: ffffffff8badfb44 RCX: 0000000000000305 RDX: ffffffff81759195 RSI: ffffffff8e55a3a0 RDI: ffffffff8badfb40 RBP: ffffc90000a07740 R08: ffffc9000bcb7eb8 R09: 0000000000000000 R10: ffffc90000a078d8 R11: fffff52000140f1d R12: dffffc0000000000 R13: ffffffff81759195 R14: dffffc0000000000 R15: 0000000000000003 FS: 00007fabfe1c96c0(0000) GS:ffff8881257f8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 0000000033c40000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __fortify_strlen include/linux/fortify-string.h:268 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline] do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0xce/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [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 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:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x427/0x6f0 mm/slub.c:5315 __alloc_skb+0x1d7/0x390 net/core/skbuff.c:679 skb_copy+0x188/0x800 net/core/skbuff.c:2162 mac80211_hwsim_tx_frame_no_nl+0xd00/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891 mac80211_hwsim_tx+0x11eb/0x24d0 drivers/net/wireless/virtual/mac80211_hwsim.c:2133 drv_tx net/mac80211/driver-ops.h:38 [inline] wake_tx_push_queue net/mac80211/util.c:298 [inline] ieee80211_handle_wake_tx_queue+0x19e/0x2c0 net/mac80211/util.c:315 drv_wake_tx_queue net/mac80211/driver-ops.h:1394 [inline] schedule_and_wake_txq net/mac80211/driver-ops.h:1401 [inline] ieee80211_queue_skb+0x1a3f/0x2210 net/mac80211/tx.c:1664 ieee80211_tx+0x2c2/0x4b0 net/mac80211/tx.c:1968 __ieee80211_subif_start_xmit+0xd12/0x1660 net/mac80211/tx.c:4346 ieee80211_subif_start_xmit+0xf3/0x570 net/mac80211/tx.c:4542 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x169c/0x3820 net/core/dev.c:4819 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4037 call_timer_fn+0x192/0x5a0 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/0x7c0 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:memset_orig+0x46/0xb0 arch/x86/lib/memset_64.S:74 Code: 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 <48> 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 RSP: 0018:ffffc9000bcb7138 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffe8ffffd6fcc8 RCX: 0000000000000002 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffc9000bcb7240 RBP: ffffc9000bcb73e8 R08: ffffc9000bcb72ff R09: 0000000000000000 R10: ffffc9000bcb7200 R11: fffff52001796e60 R12: 1ffff92001796e38 R13: dffffc0000000000 R14: ffffe8ffffdb5000 R15: ffffc9000bcb7200 perf_tp_event+0x108/0x29b0 kernel/events/core.c:11057 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11005 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x33e/0x420 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+0x2ea/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [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:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 lsm_file_alloc security/security.c:169 [inline] security_file_alloc+0x34/0x310 security/security.c:2380 init_file+0x93/0x2f0 fs/file_table.c:159 alloc_empty_file+0x6e/0x1d0 fs/file_table.c:241 alloc_file fs/file_table.c:354 [inline] alloc_file_pseudo+0x155/0x240 fs/file_table.c:383 __anon_inode_getfile fs/anon_inodes.c:166 [inline] __anon_inode_getfd fs/anon_inodes.c:283 [inline] anon_inode_getfd+0xc8/0x1f0 fs/anon_inodes.c:307 map_create+0x1247/0x16a0 kernel/bpf/syscall.c:1597 __sys_bpf+0x6e1/0x950 kernel/bpf/syscall.c:6200 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline] __se_sys_bpf kernel/bpf/syscall.c:6329 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fabfd39aeb9 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:00007fabfe1c9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fabfd615fa0 RCX: 00007fabfd39aeb9 RDX: 0000000000000048 RSI: 0000200000000180 RDI: 0000000000000000 RBP: 00007fabfd408c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fabfd616038 R14: 00007fabfd615fa0 R15: 00007ffcc054c878 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6300 Comm: syz.3.105 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline] RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline] RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212 Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 50 c5 25 0a cc 89 f6 31 d2 e9 46 23 6a 03 66 0f 1f 44 00 RSP: 0018:ffffc90000007610 EFLAGS: 00000046 RAX: 0000000000000147 RBX: ffff8880b8623e40 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 0000000000000147 RDI: 0000000000000838 RBP: 0000000000000000 R08: ffffc90000007217 R09: 0000000000000000 R10: ffffc90000007208 R11: ffffffff8172e570 R12: 0000000010005590 R13: dffffc0000000000 R14: 0000000000000147 R15: 0000000000000020 FS: 00007fa12c9ff6c0(0000) GS:ffff8881256f8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556758e2ba38 CR3: 0000000034fea000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_write arch/x86/include/asm/apic.h:409 [inline] lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418 clockevents_program_event+0x1c9/0x350 kernel/time/clockevents.c:334 hrtimer_interrupt+0xb08/0x1010 kernel/time/hrtimer.c:1916 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 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:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:430 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x65e/0xbc0 kernel/locking/qspinlock.c:325 Code: 24 48 0f b6 04 01 84 c0 75 6f 48 8b 44 24 10 80 38 00 74 1d 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 c6 44 01 06 f8 f3 90 <41> ff c4 75 bf eb 68 4c 8b 7c 24 10 4c 89 ff be 02 00 00 00 e8 f9 RSP: 0018:ffffc90000007880 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: ffffc90000007920 RCX: 1ffff92000000f1c RDX: 0000000000000100 RSI: ffffffff8dccc99d RDI: ffff8880b863b840 RBP: ffffc90000007990 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: 00000000fffff7ff R13: 0000000000000000 R14: 1ffffffff1e3cc20 R15: ffff8880b863b854 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116 spin_lock include/linux/spinlock.h:351 [inline] mac80211_hwsim_tx_frame_no_nl+0x73a/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1842 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x527/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1858 handle_softirqs+0x22a/0x7c0 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194 Code: f7 e8 8d 68 07 f6 f7 c3 00 02 00 00 74 05 e8 40 c5 32 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 74 4a f9 f5 65 8b 05 cd f5 58 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90005347890 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000206 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8dccc99d RDI: 0000000000000001 RBP: ffffea0001df89c0 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: ffffea0001df89c0 R13: 0000000000000004 R14: ffff88813fe25240 R15: ffffea0000bd40d0 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] get_partial_node+0x3bc/0x420 mm/slub.c:3550 get_partial mm/slub.c:3630 [inline] ___slab_alloc+0xcd7/0x1760 mm/slub.c:4631 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_noprof+0x40d/0x6e0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] call_usermodehelper_setup+0x8e/0x270 kernel/umh.c:362 call_modprobe kernel/module/kmod.c:97 [inline] __request_module+0x3ba/0x610 kernel/module/kmod.c:172 dev_load+0x190/0x1f0 net/core/dev_ioctl.c:700 dev_ioctl+0x429/0x1150 net/core/dev_ioctl.c:748 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+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa12bb9aeb9 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:00007fa12c9ff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa12be15fa0 RCX: 00007fa12bb9aeb9 RDX: 0000200000000040 RSI: 0000000000008927 RDI: 000000000000000c RBP: 00007fa12bc08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa12be16038 R14: 00007fa12be15fa0 R15: 00007ffe139157d8