watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.2.18:486] Modules linked in: CPU: 0 PID: 486 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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+0x105/0x150 arch/x86/kernel/kvm.c:1064 Code: 09 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 2d 09 33 04 fb f4 5e ff ff ff fb e9 58 ff ff ff e8 db 6a c4 03 89 f9 80 e1 07 38 RSP: 0018:ffffc90000cb78a0 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff888114012398 RCX: ffffffff85007792 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888114012398 RBP: ffffc90000cb7930 R08: ffff888114012398 R09: 1ffff11022802473 R10: dffffc0000000000 R11: ffffed1022802474 R12: 1ffff1103edc0001 R13: ffff8881f6e38cd4 R14: dffffc0000000000 R15: 1ffff92000196f14 FS: 0000555558dc7500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f94119e7dc0 CR3: 00000001157a5000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 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+0x690/0xc40 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+0x90/0x2a0 net/core/sock.c:3515 lock_sock include/net/sock.h:1818 [inline] tipc_release+0xb2/0x1670 net/tipc/socket.c:639 __sock_release net/socket.c:652 [inline] sock_close+0xf1/0x290 net/socket.c:1390 __fput+0x1fc/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: 0033:0x7f941199a679 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:00007fffc5e319f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f9411c07da0 RCX: 00007f941199a679 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9411c07da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007f9411c07cb0 R11: 0000000000000246 R12: 000000000000d13e R13: 00007f9411c0609c R14: 000000000000ce63 R15: 00007f9411c06090 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 487 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:memcmp lib/string.c:783 [inline] RIP: 0010:bcmp+0x1b5/0x230 lib/string.c:804 Code: 1f 48 89 c1 48 c1 e9 03 42 0f b6 0c 39 84 c9 75 2b 0f b6 04 1f 48 8d 0c 1e 49 89 c8 49 c1 e8 03 47 0f b6 04 38 45 84 c0 75 3a <0f> b6 0c 1e 29 c8 75 64 48 ff c3 48 39 da 75 c3 eb 58 41 89 c0 41 RSP: 0018:ffffc90000cc6838 EFLAGS: 00000297 RAX: 00000000000000ae RBX: 0000000000000003 RCX: ffffc90000cc6903 RDX: 0000000000000004 RSI: ffffc90000cc6900 RDI: ffff888114012668 RBP: ffffc90000cc6870 R08: 0000000000000004 R09: 0000000000cc6903 R10: dffffc0000000000 R11: fffff52000198d20 R12: ffff8881140126f0 R13: 00000000000003f0 R14: dffffc0000000000 R15: dffffc0000000000 FS: 00007f94127be6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f941279cff8 CR3: 00000001157a5000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcmp include/linux/fortify-string.h:549 [inline] rhashtable_compare include/linux/rhashtable.h:577 [inline] __rhashtable_lookup include/linux/rhashtable.h:602 [inline] rhashtable_lookup include/linux/rhashtable.h:638 [inline] tipc_sk_lookup+0x313/0x620 net/tipc/socket.c:3001 tipc_sk_rcv+0x416/0x2c10 net/tipc/socket.c:2492 tipc_node_xmit+0x26c/0xd90 net/tipc/node.c:1703 tipc_node_xmit_skb+0xf7/0x150 net/tipc/node.c:1768 tipc_sk_rcv+0x1d63/0x2c10 net/tipc/socket.c:2522 tipc_node_xmit+0x26c/0xd90 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+0x158e/0x2cf0 net/tipc/socket.c:2364 tipc_sk_enqueue net/tipc/socket.c:2445 [inline] tipc_sk_rcv+0x7ed/0x2c10 net/tipc/socket.c:2497 tipc_node_xmit+0x26c/0xd90 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:1150 [inline] __release_sock+0x154/0x380 net/core/sock.c:2951 release_sock+0x60/0x1c0 net/core/sock.c:3527 tipc_release+0xd4a/0x1670 net/tipc/socket.c:652 __sock_release net/socket.c:652 [inline] sock_close+0xf1/0x290 net/socket.c:1390 __fput+0x1fc/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: 0033:0x7f941199a679 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:00007f94127be028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 00000000000203a0 RBX: 00007f9411c05fa0 RCX: 00007f941199a679 RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003 RBP: 00007f9411a2dee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9411c06038 R14: 00007f9411c05fa0 R15: 00007fffc5e31898