watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.8.4790:12914] Modules linked in: CPU: 0 PID: 12914 Comm: syz.8.4790 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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: 1b 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 cd 1b 33 04 fb f4 5e ff ff ff fb e9 58 ff ff ff e8 eb 20 c5 03 89 f9 80 e1 07 38 RSP: 0018:ffffc90001017540 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff888127e72d98 RCX: ffffffff85012029 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888127e72d98 RBP: ffffc900010175d0 R08: ffff888127e72d98 R09: 1ffff11024fce5b3 R10: dffffc0000000000 R11: ffffed1024fce5b4 R12: 1ffff11024fce5b3 R13: ffff8881f6e38cd4 R14: dffffc0000000000 R15: 1ffff92000202ea8 FS: 00007f6df01c36c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200001000000 CR3: 000000012a559000 CR4: 00000000003506b0 DR0: 000000000000000c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 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_sendstream+0x47/0x70 net/tipc/socket.c:1549 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5fb/0x9c0 net/socket.c:2508 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2562 __sys_sendmmsg+0x2cc/0x4e0 net/socket.c:2648 __do_sys_sendmmsg net/socket.c:2677 [inline] __se_sys_sendmmsg net/socket.c:2674 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2674 x64_sys_call+0x3f5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6def39de99 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:00007f6df01c3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f6def625fa0 RCX: 00007f6def39de99 RDX: 04000000000001cd RSI: 0000200000005280 RDI: 0000000000000005 RBP: 00007f6def433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 000000001008c811 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6def626038 R14: 00007f6def625fa0 R15: 00007ffd0bfd9958 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12916 Comm: syz.8.4790 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:193 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:313 Code: 50 03 91 7e 65 8b 0d 51 03 91 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 6c 0b 00 00 00 74 52 8b 8a 48 0b 00 00 <83> f9 03 75 47 48 8b 8a 50 0b 00 00 44 8b 8a 4c 0b 00 00 49 c1 e1 RSP: 0018:ffffc90000e869f0 EFLAGS: 00000246 RAX: ffffffff84d9b05c RBX: dffffc0000000000 RCX: 0000000000000002 RDX: ffff888154d95100 RSI: 00000000fedafc0d RDI: 0000000000000000 RBP: ffffc90000e869f0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520001d0d30 R12: ffff8881371e5e40 R13: ffff888127e72d80 R14: 00000000fedafc0d R15: 00000000fedafc0d FS: 00007f6df01a26c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000a038 CR3: 000000012a559000 CR4: 00000000003506a0 DR0: 000000000000000c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tipc_sk_rcv+0x28c/0x2c20 net/tipc/socket.c:-1 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: 0033:0x7f6def39de99 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:00007f6df01a2028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f6def626090 RCX: 00007f6def39de99 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f6def433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6def626128 R14: 00007f6def626090 R15: 00007ffd0bfd9958