watchdog: BUG: soft lockup - CPU#1 stuck for 135s! [syz.5.451:8384] Modules linked in: irq event stamp: 17325581 hardirqs last enabled at (17325580): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (17325581): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (17124000): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (17124000): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (17124000): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (17124003): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (17124003): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (17124003): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 8384 Comm: syz.5.451 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:300 [inline] RIP: 0010:rcu_read_lock include/linux/rcupdate.h:838 [inline] RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1181 [inline] RIP: 0010:unwind_next_frame+0x9e/0x23c0 arch/x86/kernel/unwind_orc.c:495 Code: b6 04 2c 84 c0 0f 85 e7 1b 00 00 41 8b 06 85 c0 0f 84 4f 02 00 00 89 84 24 8c 00 00 00 4c 89 bc 24 90 00 00 00 e8 d2 f8 34 00 <4c> 8d 3d 00 00 00 00 48 c7 c7 e0 e5 75 8e 31 f6 31 d2 b9 02 00 00 RSP: 0018:ffffc90000a08498 EFLAGS: 00000283 RAX: 0000000000000002 RBX: ffffffff8231670c RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: ffffffff8231670c RDI: ffffc90000a08568 RBP: dffffc0000000000 R08: ffffc90000a08630 R09: 0000000000000001 R10: ffffc90000a085b8 R11: ffffffff81b0d0f0 R12: 1ffff920001410ad R13: ffffc90000a085a0 R14: ffffc90000a08568 R15: ffffc90000a088d8 FS: 00007f90f9f7d6c0(0000) GS:ffff888125552000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd95b3a6020 CR3: 00000000325ba000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 skb_copy+0x188/0x800 net/core/skbuff.c:2195 mac80211_hwsim_tx_frame_no_nl+0xd00/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891 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:760 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 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 a8 e1 f5 e8 ee 58 1b f6 fb bf 01 00 00 00 c3 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 5a 1b f6 bf 01 RSP: 0018:ffffc900047a7490 EFLAGS: 00000202 RAX: 0000000000842897 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000007 RSI: ffffffff8defbd7a RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011eab7 R09: 1ffffffff2023d56 R10: dffffc0000000000 R11: fffffbfff2023d57 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:constant_test_bit arch/x86/include/asm/bitops.h:202 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:232 [inline] RIP: 0010:tif_test_bit include/linux/thread_info.h:199 [inline] RIP: 0010:tif_need_resched include/linux/thread_info.h:215 [inline] RIP: 0010:need_resched include/linux/sched.h:2249 [inline] RIP: 0010:preempt_schedule_common+0xa4/0xd0 kernel/sched/core.c:7103 Code: 00 00 00 e8 0e a8 ff ff 65 8b 05 e7 9c 6a 07 65 ff 0d e0 9c 6a 07 65 48 8b 1d b0 9c 6a 07 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <0f> 84 67 ff ff ff 48 89 df e8 ee 55 7f f6 e9 5a ff ff ff 5b 41 5e RSP: 0018:ffffc900047a75b0 EFLAGS: 00000246 RAX: 1ffff11004b7fb70 RBX: ffff888025bfdb80 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8c27d9e0 RDI: ffffffff8c27d9a0 RBP: ffffc900047a7618 R08: ffffffff9011eab7 R09: 1ffffffff2023d56 R10: dffffc0000000000 R11: fffffbfff2023d57 R12: ffff88813fe019c0 R13: ffff88813fe028c0 R14: ffff888025bff0c8 R15: dffffc0000000000 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline] __slab_free+0x211/0x2b0 mm/slub.c:-1 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_node_noprof+0x391/0x6b0 mm/slub.c:5388 kmalloc_node_noprof include/linux/slab.h:1077 [inline] __get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3221 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4140 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2986 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6252 __do_sys_bpf kernel/bpf/syscall.c:6365 [inline] __se_sys_bpf kernel/bpf/syscall.c:6363 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6363 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: 0033:0x7f90f919c819 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:00007f90f9f7d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f90f9415fa0 RCX: 00007f90f919c819 RDX: 0000000000000094 RSI: 00002000000027c0 RDI: 0000000000000005 RBP: 00007f90f9232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f90f9416038 R14: 00007f90f9415fa0 R15: 00007ffd2fa7e568 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8383 Comm: syz.6.452 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:perf_swevent_event+0x72b/0x7e0 kernel/events/core.c:10904 Code: 00 00 75 11 e8 76 e0 ca ff 4d 85 e4 75 16 e8 6c e0 ca ff eb 15 e8 65 e0 ca ff e8 20 3e b6 09 4d 85 e4 74 ea e8 56 e0 ca ff fb <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 65 48 8b 05 8c RSP: 0018:ffffc900000072a0 EFLAGS: 00000046 RAX: ffffffff81facedf RBX: 1ffff92000000e5c RCX: ffff888036dadb80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007370 R08: ffffc90000007457 R09: 0000000000000000 R10: ffffc90000007448 R11: fffff52000000e8b R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880529a1f68 FS: 00007fcdae1836c0(0000) GS:ffff888125452000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9c5415f40 CR3: 000000007783a000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_tp_event+0x608/0x2a90 kernel/events/core.c:11415 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11334 do_perf_trace_preemptirq_template include/trace/events/preemptirq.h:14 [inline] perf_trace_preemptirq_template+0x26f/0x350 include/trace/events/preemptirq.h:14 __do_trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_irq_disable+0x110/0x150 include/trace/events/preemptirq.h:36 irqentry_enter+0xac/0x130 kernel/entry/common.c:168 sysvec_apic_timer_interrupt+0xe/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 e9 RSP: 0018:ffffc90000007880 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: ffffc90000007920 RCX: 1ffff92000000f1c RDX: 0000000000000100 RSI: ffffffff8defbd7a RDI: ffff8880b863bd40 RBP: ffffc90000007990 R08: ffffffff9011eab7 R09: 1ffffffff2023d56 R10: dffffc0000000000 R11: fffffbfff2023d57 R12: 00000000ffffa529 R13: 0000000000000000 R14: 1ffffffff1e812cc R15: ffff8880b863bd54 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [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:341 [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:760 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 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:strlen+0x3f/0x70 lib/string.c:420 Code: 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 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 29 e0 RSP: 0018:ffffc900047264d8 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff8bce0161 RCX: 0000000000000000 RDX: ffffffff823dceca RSI: ffffffff8e75e5e0 RDI: ffffffff8bce0160 RBP: ffffc900047265f0 R08: ffff88801e957b5f R09: 1ffff11003d2af6b R10: dffffc0000000000 R11: ffffed1003d2af6c R12: dffffc0000000000 R13: ffffffff823dceca R14: dffffc0000000000 R15: ffffffffffffffff __fortify_strlen include/linux/fortify-string.h:266 [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+0xd5/0x410 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+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] __page_table_check_zero+0x397/0x3e0 mm/page_table_check.c:145 page_table_check_free include/linux/page_table_check.h:46 [inline] __free_pages_prepare mm/page_alloc.c:1434 [inline] __free_frozen_pages+0xc3b/0xdb0 mm/page_alloc.c:2978 __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] nf_nat_masq_schedule+0x31f/0x6e0 net/netfilter/nf_nat_masquerade.c:118 masq_device_event+0xa2/0xe0 net/netfilter/nf_nat_masquerade.c:162 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] __dev_notify_flags+0x16d/0x310 net/core/dev.c:9822 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9849 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3798 [inline] __rtnl_newlink net/core/rtnetlink.c:3957 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4094 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6980 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: 0033:0x7fcdad39c819 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:00007fcdae183028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcdad615fa0 RCX: 00007fcdad39c819 RDX: 0000000000000000 RSI: 0000200000000600 RDI: 000000000000000d RBP: 00007fcdad432c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcdad616038 R14: 00007fcdad615fa0 R15: 00007fff3c1dab18