watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.3.84:6195] Modules linked in: irq event stamp: 14950295 hardirqs last enabled at (14950294): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (14950295): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (14516792): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14516792): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14516792): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (14516795): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14516795): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14516795): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6195 Comm: syz.3.84 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 91 af f6 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 7b 30 52 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 88 f8 51 RSP: 0018:ffffc90000007278 EFLAGS: 00000286 RAX: 4f032f486180ba00 RBX: 0000000000000000 RCX: 0000000000000101 RDX: 000000005a44979c RSI: ffffffff8df36f87 RDI: ffffffff8c073f80 RBP: ffffffff81759195 R08: ffffffff81759195 R09: ffffffff8e55a3a0 R10: ffffc90000006e88 R11: fffff52000000dd3 R12: 0000000000000002 R13: ffffffff8e55a3a0 R14: 0000000000000000 R15: 0000000000000246 FS: 00007f8a80d736c0(0000) GS:ffff8881256f8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efcb1de8600 CR3: 0000000077780000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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_node_noprof+0x427/0x6f0 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x204/0x390 net/core/skbuff.c:690 napi_alloc_skb+0x84/0x7c0 net/core/skbuff.c:832 page_to_skb+0x2ce/0x870 drivers/net/virtio_net.c:904 receive_mergeable drivers/net/virtio_net.c:2514 [inline] receive_buf+0x546/0x1900 drivers/net/virtio_net.c:2660 virtnet_receive_packets drivers/net/virtio_net.c:3023 [inline] virtnet_receive drivers/net/virtio_net.c:3047 [inline] virtnet_poll+0x2193/0x3000 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x340 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7883 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 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 a3 fa f5 e8 0e 20 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 94 21 34 f6 bf 01 RSP: 0018:ffffc900054cf7b0 EFLAGS: 00000206 RAX: 0000000000a9fa35 RBX: ffff888025651e80 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccca83 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef0177 R09: 1ffffffff1fde02e R10: dffffc0000000000 R11: fffffbfff1fde02f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:228 [inline] RIP: 0010:unwind_next_frame+0x214/0x23c0 arch/x86/kernel/unwind_orc.c:510 Code: ef 08 8b 15 4e 40 82 0c 8d 42 ff 44 39 f8 0f 86 78 04 00 00 44 89 f8 4c 8d 2c 85 bc d0 2d 91 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 25 1c 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d RSP: 0018:ffffc900054cf8d8 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080000000 RDX: 00000000000a9ac4 RSI: ffffffff8c073f60 RDI: ffffffff8c073f20 RBP: dffffc0000000000 R08: ffffffff81759195 R09: ffffffff8e55a3a0 R10: ffffc900054cf4c8 R11: fffff52000a99e9b R12: ffffffff895e114c R13: ffffffff914f4900 R14: ffffc900054cf9a8 R15: 0000000000085e11 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_lru_noprof+0x35f/0x6c0 mm/slub.c:5282 sock_alloc_inode+0x28/0xc0 net/socket.c:322 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:2964 [inline] sock_alloc net/socket.c:637 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1569 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 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: 0033:0x7f8a7ff9aeb9 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:00007f8a80d73028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f8a80215fa0 RCX: 00007f8a7ff9aeb9 RDX: 00000000000000ff RSI: 0000000000000003 RDI: 0000840000000002 RBP: 00007f8a80008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8a80216038 R14: 00007f8a80215fa0 R15: 00007ffced8d9b98 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6187 Comm: syz.2.82 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__perf_event_overflow+0x9a9/0xec0 kernel/events/core.c:10472 Code: e8 03 42 80 3c 28 00 48 8b 5c 24 48 74 08 4c 89 e7 e8 2b 82 36 00 49 8b 3c 24 31 f6 e8 60 d8 02 00 48 c7 44 24 60 0e 36 e0 45 <48> 8b 44 24 40 4a c7 04 28 00 00 00 00 42 c7 44 28 08 00 00 00 00 RSP: 0018:ffffc90000a085e0 EFLAGS: 00000006 RAX: ffffffff81f6e0c7 RBX: 0000000000000000 RCX: ffff88802704bd00 RDX: 0000000000010100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a086f0 R08: ffffc90000a08437 R09: 0000000000000000 R10: ffffc90000a08420 R11: fffff52000141087 R12: ffff8880272fbed0 R13: dffffc0000000000 R14: ffff8880272fc310 R15: ffffc90000a08780 FS: 00007efcafff66c0(0000) GS:ffff8881257f8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9015d62070 CR3: 000000007f80e000 CR4: 00000000003526f0 Call Trace: perf_swevent_hrtimer+0x3e0/0x590 kernel/events/core.c:11856 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x4dc/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1903 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:seqcount_lockdep_reader_access+0xec/0x100 include/linux/seqlock.h:75 Code: 00 75 11 e8 e6 c1 12 00 4d 85 ff 75 16 e8 dc c1 12 00 eb 15 e8 d5 c1 12 00 e8 b0 4a e5 09 4d 85 ff 74 ea e8 c6 c1 12 00 fb 5b <41> 5e 41 5f e9 1b 2e e8 09 cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc90000a08cf8 EFLAGS: 00000246 RAX: ffffffff81b1b47a RBX: 0000000000000000 RCX: ffff88802704bd00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000019000 R08: ffffffff8fef0177 R09: 1ffffffff1fde02e R10: dffffc0000000000 R11: fffffbfff1fde02f R12: 1ffff1100af72e08 R13: dffffc0000000000 R14: ffffffff81b1b4e5 R15: 0000000000000200 ktime_get+0x45/0x200 kernel/time/timekeeping.c:824 hrtimer_forward_now include/linux/hrtimer.h:362 [inline] mac80211_hwsim_beacon+0x124/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2404 __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:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x194/0x5050 kernel/sched/core.c:6740 Code: 48 89 df e8 ee 88 95 f6 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 cc 88 95 f6 <48> 81 3b 9d 6e ac 57 0f 85 a5 19 00 00 45 85 ed 7f 54 49 8d 5e 18 RSP: 0018:ffffc9000b887260 EFLAGS: 00000246 RAX: 1ffff92001710000 RBX: ffffc9000b880000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8c073f60 RDI: ffffffff8c073f20 RBP: ffffc9000b887450 R08: ffffffff8fef0177 R09: 1ffffffff1fde02e R10: dffffc0000000000 R11: fffffbfff1fde02f R12: ffff8881257f8000 R13: 0000000000000001 R14: ffff88802704bd00 R15: 1ffff110170e7680 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__reset_page_owner+0x55/0x1f0 mm/page_owner.c:311 Code: 0f 84 52 01 00 00 48 8b 0d 08 ef 33 0c 48 8d 1c 08 48 83 c3 08 48 89 d9 48 c1 e9 03 48 ba 00 00 00 00 00 fc ff df 0f b6 0c 11 <84> c9 0f 85 49 01 00 00 8b 1b 48 89 c7 e8 09 c5 01 00 bf 00 20 00 RSP: 0018:ffffc9000b887580 EFLAGS: 00000a02 RAX: ffff88801d267c80 RBX: ffff88801d267c90 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000000789e3 RDI: 00000000000789e4 RBP: 0000000000000003 R08: ffffffff82395062 R09: ffffffff8e55a3a0 R10: ffffc9000b887148 R11: fffff52001710e2b R12: 0000000000000000 R13: 0000000000000000 R14: ffffea00015eca00 R15: 000000367b79544d reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbf8/0xd70 mm/page_alloc.c:2943 __slab_free+0x2ce/0x320 mm/slub.c:6004 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:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 anon_vma_alloc mm/rmap.c:93 [inline] anon_vma_fork+0xde/0x500 mm/rmap.c:359 dup_mmap+0x97a/0x1bb0 mm/mmap.c:1790 dup_mm kernel/fork.c:1529 [inline] copy_mm+0x13b/0x4b0 kernel/fork.c:1581 copy_process+0x166e/0x3980 kernel/fork.c:2221 kernel_clone+0x248/0x870 kernel/fork.c:2651 __do_sys_clone kernel/fork.c:2792 [inline] __se_sys_clone kernel/fork.c:2776 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2776 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: 0033:0x7efcb1d9aeb9 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:00007efcafff5fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007efcb2015fa0 RCX: 00007efcb1d9aeb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 00007efcb1e08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007efcb2016038 R14: 00007efcb2015fa0 R15: 00007ffe6cca54d8