watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.0.147:838] Modules linked in: CPU: 1 PID: 838 Comm: syz.0.147 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:918 Code: 1d d6 03 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 3d 1d d6 03 fb f4 5e ff ff ff fb e9 58 ff ff ff e8 5b 52 7d 03 89 f9 80 e1 07 38 RSP: 0018:ffffc900017bf6c0 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff88810c075488 RCX: ffffffff81500419 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88810c075488 RBP: ffffc900017bf750 R08: ffff88810c075488 R09: 1ffff1102180ea91 R10: dffffc0000000000 R11: ffffed102180ea92 R12: 1ffff1103ee20001 R13: ffff8881f7138ad4 R14: dffffc0000000000 R15: 1ffff920002f7ed8 FS: 00007f7991a586c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000123e83000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:597 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline] queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:188 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0xe4/0xf0 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:369 [inline] lock_sock_nested+0x95/0x2a0 net/core/sock.c:3278 lock_sock include/net/sock.h:1743 [inline] tipc_sendstream+0x47/0x70 net/tipc/socket.c:1549 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7991fe0be9 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:00007f7991a58028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f79921aef80 RCX: 00007f7991fe0be9 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000004 RBP: 00007f79920642bf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f79921aef80 R15: 00007ffce62fac98 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 839 Comm: syz.0.147 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:227 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:293 Code: e0 a2 98 7e 65 8b 15 e1 a2 98 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 5b 83 b9 5c 0b 00 00 00 74 52 8b 91 38 0b 00 00 <83> fa 03 75 47 48 8b 91 40 0b 00 00 44 8b 89 3c 0b 00 00 49 c1 e1 RSP: 0018:ffffc900017de7b0 EFLAGS: 00000246 RAX: ffffffff84986733 RBX: 0000000000000005 RCX: ffff8881181a62c0 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001 RBP: ffffc900017de7b0 R08: ffff88810c075483 R09: 1ffff1102180ea90 R10: dffffc0000000000 R11: ffffed102180ea91 R12: ffff88810c075400 R13: dffffc0000000000 R14: ffff88810c075480 R15: 00000000bd74ab07 FS: 00007f7991a376c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7991a36ff8 CR3: 0000000123e83000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_sub_and_test include/linux/refcount.h:277 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] sock_put include/net/sock.h:1987 [inline] tipc_sk_rcv+0x1a23/0x2c20 net/tipc/socket.c:2502 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x2a3/0x3b0 net/tipc/node.c:1783 tipc_sk_rcv+0x19f7/0x2c20 net/tipc/socket.c:2501 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1703 tipc_sk_push_backlog+0x4dd/0x790 net/tipc/socket.c:1316 tipc_sk_conn_proto_rcv net/tipc/socket.c:1370 [inline] tipc_sk_proto_rcv+0xa65/0x1560 net/tipc/socket.c:2158 tipc_sk_filter_rcv+0x2ac0/0x2cb0 net/tipc/socket.c:2352 tipc_sk_enqueue net/tipc/socket.c:2445 [inline] tipc_sk_rcv+0x794/0x2c20 net/tipc/socket.c:2497 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x2a3/0x3b0 net/tipc/node.c:1783 tipc_sk_backlog_rcv+0x17d/0x210 net/tipc/socket.c:2412 sk_backlog_rcv include/net/sock.h:1090 [inline] __release_sock+0x17c/0x3f0 net/core/sock.c:2737 release_sock net/core/sock.c:3290 [inline] sock_setsockopt+0x1d7a/0x2490 net/core/sock.c:1381 __sys_setsockopt+0x261/0x470 net/socket.c:2198 __do_sys_setsockopt net/socket.c:2213 [inline] __se_sys_setsockopt net/socket.c:2210 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2210 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7991fe0be9 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:00007f7991a37028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f79921af058 RCX: 00007f7991fe0be9 RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f79920642bf R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000540 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f79921af058 R15: 00007ffce62fac98