watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.2.530:2127] Modules linked in: CPU: 0 PID: 2127 Comm: syz.2.530 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:kvm_wait+0x105/0x150 arch/x86/kernel/kvm.c:1064 Code: 21 33 04 f4 eb 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07 40 38 f0 75 10 66 90 0f 00 2d ed 20 33 04 fb f4 5e ff ff ff fb e9 58 ff ff ff e8 ab 0e c5 03 89 f9 80 e1 07 38 RSP: 0018:ffffc9000c0078c0 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff88811e930598 RCX: ffffffff85010019 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88811e930598 RBP: ffffc9000c007950 R08: ffff88811e930598 R09: 1ffff11023d260b3 R10: dffffc0000000000 R11: ffffed1023d260b4 R12: 1ffff11023d260b3 R13: ffff8881f6e38cd4 R14: dffffc0000000000 R15: 1ffff92001800f18 FS: 000055556e478500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000011450c000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x687/0xc40 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock include/linux/spinlock.h:187 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0xe4/0xf0 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x90/0x290 net/core/sock.c:3515 lock_sock include/net/sock.h:1818 [inline] tipc_release+0xb3/0x1640 net/tipc/socket.c:639 __sock_release net/socket.c:652 [inline] sock_close+0xc9/0x220 net/socket.c:1389 __fput+0x1fd/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbf3f99ce59 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:00007fffd9e50818 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fbf3fc17da0 RCX: 00007fbf3f99ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fbf3fc17da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007fbf3fc17cb0 R11: 0000000000000246 R12: 000000000001b6fb R13: 00007fbf3fc1618c R14: 000000000001b4a9 R15: 00007fbf3fc16180 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2128 Comm: syz.2.530 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:286 Code: 11 10 48 89 74 11 18 48 89 44 11 20 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 b8 7d 47 2f 67 <55> 48 89 e5 48 8b 45 08 65 48 8b 15 e0 16 91 7e 65 8b 0d e1 16 91 RSP: 0018:ffffc900001b07f8 EFLAGS: 00000002 RAX: 1ffff110227f2cac RBX: 0000000000000001 RCX: ffff888113f96540 RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc900001b08c8 R08: ffffc900001b0701 R09: ffffc900001b0720 R10: dffffc0000000000 R11: fffff520000360f0 R12: ffffc90000a57f58 R13: dffffc0000000000 R14: 0000000000000008 R15: 1ffff92000036104 FS: 00007fbf407bc6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000003332 CR3: 000000011450c000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_callchain kernel/events/core.c:7464 [inline] perf_prepare_sample+0x399/0x1d30 kernel/events/core.c:7497 __perf_event_output kernel/events/core.c:7682 [inline] perf_event_output_forward+0xd1/0x1a0 kernel/events/core.c:7702 __perf_event_overflow+0x458/0x640 kernel/events/core.c:9448 perf_event_overflow kernel/events/core.c:9469 [inline] perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3ad/0x8c0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:__kasan_check_write+0x1/0x20 mm/kasan/shadow.c:36 Code: 8b 4d 08 31 d2 e8 df e7 ff ff 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 b8 f1 16 b4 ef 55 <48> 89 e5 89 f6 48 8b 4d 08 ba 01 00 00 00 e8 ac e7 ff ff 5d c3 66 RSP: 0018:ffffc90000a56950 EFLAGS: 00000256 RAX: 0000000000000401 RBX: ffffc90000a56e34 RCX: ffffffff8500de37 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000a56980 RBP: ffffc90000a569f0 R08: ffffc90000a56e37 R09: 1ffff9200014adc6 R10: dffffc0000000000 R11: fffff5200014adc7 R12: dffffc0000000000 R13: ffff88811e930580 R14: ffffc90000a56980 R15: 1ffff9200014ad2c spin_lock_bh include/linux/spinlock.h:356 [inline] tipc_skb_peek_port net/tipc/msg.h:1225 [inline] tipc_sk_rcv+0x25c/0x2c20 net/tipc/socket.c:2493 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703 tipc_node_xmit_skb+0xf7/0x150 net/tipc/node.c:1768 tipc_sk_rcv+0x1d57/0x2c20 net/tipc/socket.c:2524 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703 tipc_sk_push_backlog net/tipc/socket.c:1316 [inline] tipc_sk_filter_connect net/tipc/socket.c:2257 [inline] tipc_sk_filter_rcv+0x19d7/0x3010 net/tipc/socket.c:2366 tipc_sk_enqueue net/tipc/socket.c:2447 [inline] tipc_sk_rcv+0x7e7/0x2c20 net/tipc/socket.c:2499 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x277/0x390 net/tipc/node.c:1783 tipc_sk_backlog_rcv+0x174/0x220 net/tipc/socket.c:2414 sk_backlog_rcv include/net/sock.h:1150 [inline] __release_sock+0x154/0x380 net/core/sock.c:2951 release_sock+0x60/0x1c0 net/core/sock.c:3527 tipc_release+0xd1a/0x1640 net/tipc/socket.c:652 __sock_release net/socket.c:652 [inline] sock_close+0xc9/0x220 net/socket.c:1389 __fput+0x1fd/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbf3f99ce59 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:00007fbf407bc028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: 00000000000101d0 RBX: 00007fbf3fc15fa0 RCX: 00007fbf3f99ce59 RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000005 RBP: 00007fbf407bc090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fbf3fc16038 R14: 00007fbf3fc15fa0 R15: 00007fffd9e506b8