watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.6.1390:4535] Modules linked in: CPU: 0 PID: 4535 Comm: syz.6.1390 Not tainted 5.15.189-syzkaller-00091-gf32b52534f1d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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+0xf2/0x140 arch/x86/kernel/kvm.c:918 Code: 92 d6 03 f4 eb 9a 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 00 92 d6 03 fb f4 71 ff ff ff fb e9 6b ff ff ff e8 8e 83 6f 03 89 f9 80 e1 07 38 RSP: 0018:ffffc90003577900 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff88811ee11988 RCX: ffffffff814f3469 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88811ee11988 RBP: ffffc90003577990 R08: dffffc0000000000 R09: ffffed1023dc2332 R10: ffffed1023dc2332 R11: 1ffff11023dc2331 R12: 1ffff1103ee00001 R13: ffff8881f7038ad4 R14: dffffc0000000000 R15: 1ffff920006aef20 FS: 00005555897ea500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc897770f98 CR3: 00000001126db000 CR4: 00000000003506b0 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:187 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0xd8/0xe0 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:368 [inline] lock_sock_nested+0x97/0x290 net/core/sock.c:3270 lock_sock include/net/sock.h:1694 [inline] tipc_release+0xb2/0x1630 net/tipc/socket.c:639 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1336 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4ae2c95b69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca6bb2df8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f4ae2ebeba0 RCX: 00007f4ae2c95b69 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f4ae2ebeba0 R08: 0000000000000000 R09: 00000003a6bb30ef R10: 00007f4ae2ebeac0 R11: 0000000000000246 R12: 000000000003485a R13: 00007f4ae2ebd080 R14: ffffffffffffffff R15: 00007ffca6bb2f10 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4540 Comm: syz.6.1390 Not tainted 5.15.189-syzkaller-00091-gf32b52534f1d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:preempt_count_add+0x3b/0x1b0 kernel/sched/core.c:5628 Code: ff df 48 c7 c0 20 3f 0c 87 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 01 01 00 00 83 3d 5e 36 c5 05 00 75 07 65 8b 05 bd 64 bb 7e <65> 01 3d b6 64 bb 7e 48 c7 c0 20 3f 0c 87 48 c1 e8 03 42 0f b6 04 RSP: 0018:ffffc9000375e898 EFLAGS: 00000246 RAX: 0000000000000201 RBX: ffff88811ee11988 RCX: ffffffff870c3f03 RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000201 RBP: ffffc9000375e8b0 R08: dffffc0000000000 R09: ffffed1023e62279 R10: ffffed1023e62279 R11: 1ffff11023e62278 R12: dffffc0000000000 R13: 1ffff920006ebd18 R14: ffffffff848a61bb R15: dffffc0000000000 FS: 00007f4ae27066c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef5da3e78 CR3: 00000001126db000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __local_bh_disable_ip include/linux/bottom_half.h:12 [inline] __raw_spin_trylock_bh include/linux/spinlock_api_smp.h:181 [inline] _raw_spin_trylock_bh+0x6e/0x130 kernel/locking/spinlock.c:146 spin_trylock_bh include/linux/spinlock.h:423 [inline] tipc_sk_rcv+0x42b/0x2c60 net/tipc/socket.c:2496 tipc_node_xmit+0x256/0xce0 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1783 tipc_sk_rcv+0x19de/0x2c60 net/tipc/socket.c:2501 tipc_node_xmit+0x256/0xce0 net/tipc/node.c:1703 tipc_sk_push_backlog net/tipc/socket.c:1316 [inline] tipc_sk_filter_connect net/tipc/socket.c:2255 [inline] tipc_sk_filter_rcv+0x151b/0x2c40 net/tipc/socket.c:2364 tipc_sk_enqueue net/tipc/socket.c:2445 [inline] tipc_sk_rcv+0x7b7/0x2c60 net/tipc/socket.c:2497 tipc_node_xmit+0x256/0xce0 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1783 tipc_sk_backlog_rcv+0x16f/0x1f0 net/tipc/socket.c:2412 sk_backlog_rcv include/net/sock.h:1071 [inline] __release_sock+0x143/0x350 net/core/sock.c:2731 release_sock net/core/sock.c:3282 [inline] sock_setsockopt+0x1b65/0x2270 net/core/sock.c:1381 __sys_setsockopt+0x268/0x460 net/socket.c:2199 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2211 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: 0033:0x7f4ae2c95b69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4ae2706038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f4ae2ebcfa0 RCX: 00007f4ae2c95b69 RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f4ae2d18df1 R08: 0000000000000004 R09: 0000000000000000 R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4ae2ebcfa0 R15: 00007ffca6bb2c98