watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.2.18:461]
Modules linked in:
CPU: 1 PID: 461 Comm: syz.2.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x591/0xc40 kernel/locking/qspinlock.c:511
Code: 0f 85 33 01 00 00 41 c6 45 00 00 41 0f b6 04 17 84 c0 0f 85 46 01 00 00 48 8b 44 24 10 c6 00 01 41 bd 00 80 ff ff eb 07 f3 90 <41> ff c5 74 5b 41 0f b6 04 16 84 c0 75 35 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc90000ae7940 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff888112972398 RCX: ffffffff850148a2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888112972398
RBP: ffffc90000ae7a30 R08: ffff888112972398 R09: 1ffff1102252e473
R10: dffffc0000000000 R11: ffffed102252e474 R12: 1ffff1103ede0001
R13: 00000000ffffda03 R14: 1ffff1102252e473 R15: 1ffff1102252e473
FS:  000055556ccec500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf735e8400 CR3: 000000011476d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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:1389
 __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: 0033:0x7fcf7359acb9
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:00007ffe0fa17d68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fcf73817da0 RCX: 00007fcf7359acb9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fcf73817da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007fcf73817cb0 R11: 0000000000000246 R12: 000000000000d6de
R13: 00007fcf7381609c R14: 000000000000d403 R15: 00007fcf73816090
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 462 Comm: syz.2.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__skb_dequeue include/linux/skbuff.h:2403 [inline]
RIP: 0010:tipc_node_distr_xmit+0xa2/0x3b0 net/tipc/node.c:1780
Code: 99 98 fc 4c 89 f8 48 c1 e8 03 48 89 44 24 38 42 80 3c 30 00 74 08 4c 89 ff e8 fa f5 dd fc 4d 8b 2f 4d 39 fd 0f 95 c0 4d 85 ed <0f> 95 c1 84 c8 75 0a e8 72 99 98 fc e9 b7 02 00 00 49 8d 4f 10 48
RSP: 0018:ffffc90000b26860 EFLAGS: 00000282
RAX: 1ffff92000164d00 RBX: 1ffff92000164d18 RCX: ffff88811b7e1440
RDX: 0000000000000000 RSI: ffffc90000b26b40 RDI: ffff88811b580000
RBP: ffffc90000b26970 R08: ffff88811297239b R09: 1ffff1102252e473
R10: dffffc0000000000 R11: ffffed102252e474 R12: ffff888112972300
R13: ffffc90000b26b40 R14: dffffc0000000000 R15: ffffc90000b26b40
FS:  00007fcf744346c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf74412ff8 CR3: 000000011476d000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tipc_sk_rcv+0x1a14/0x2c10 net/tipc/socket.c:2501
 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:1389
 __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: 0033:0x7fcf7359acb9
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:00007fcf74434028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fcf73815fa0 RCX: 00007fcf7359acb9
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007fcf73608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf73816038 R14: 00007fcf73815fa0 R15: 00007ffe0fa17c08
 </TASK>