watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.6.2359:9527] Modules linked in: CPU: 0 PID: 9527 Comm: syz.6.2359 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__local_bh_enable_ip+0x53/0x80 kernel/softirq.c:400 Code: 05 9a ce c3 7e a9 00 ff ff 00 75 19 48 c7 c7 60 27 08 85 e8 ff f7 64 03 65 66 8b 05 f7 d0 c4 7e 66 85 c0 75 22 bf 01 00 00 00 68 71 08 00 65 8b 05 69 ce c3 7e 85 c0 74 02 5d c3 e8 9a d7 c1 RSP: 0018:ffffc900065c6618 EFLAGS: 00000206 RAX: 0000000000000202 RBX: ffff888121d19180 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000001 RBP: ffffc900065c6618 R08: 0000000000000004 R09: 0000000000000003 R10: fffff52000cb8cb8 R11: 1ffff92000cb8cb8 R12: ffff8881075c8000 R13: dffffc0000000000 R14: ffffc900065c6ac0 R15: 00000000b5ef59a7 FS: 00007fdf3fb716c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000145573000 CR4: 00000000003526b0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x51/0x60 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:409 [inline] tipc_skb_peek_port net/tipc/msg.h:1258 [inline] tipc_sk_rcv+0x3f3/0x2c60 net/tipc/socket.c:2491 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+0xe9/0x130 net/tipc/node.c:1768 tipc_sk_respond+0x224/0x410 net/tipc/socket.c:298 __tipc_shutdown+0xeb9/0x1520 net/tipc/socket.c:590 tipc_release+0xc9/0x1630 net/tipc/socket.c:642 __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 get_signal+0x13fb/0x1480 kernel/signal.c:2679 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178 exit_to_user_mode_prepare+0x87/0xd0 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: 0033:0x7fdf41109749 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:00007fdf3fb71038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 00000000000203a0 RBX: 00007fdf4135ffa0 RCX: 00007fdf41109749 RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000006 RBP: 00007fdf4118df91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdf41360038 R14: 00007fdf4135ffa0 R15: 00007ffefad42348 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3909 Comm: kworker/u4:136 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_many_cond+0x8c3/0x9f0 kernel/smp.c:969 Code: 84 c0 0f 85 9d 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 90 37 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 d1 33 0a 00 eb 42 f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 10 41 f7 RSP: 0018:ffffc900033bf860 EFLAGS: 00000293 RAX: ffffffff815e8ba5 RBX: ffff8881f7138e80 RCX: ffff888142200000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900033bf978 R08: dffffc0000000000 R09: ffffed103ee071d9 R10: ffffed103ee071d9 R11: 1ffff1103ee071d8 R12: 1ffff1103ee271d0 R13: 1ffff1103ee07af9 R14: 0000000000000000 R15: ffff8881f703d7c8 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff169a97000 CR3: 000000000660f000 CR4: 00000000003526a0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1134 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1442 [inline] text_poke_bp_batch+0x1cd/0x5a0 arch/x86/kernel/alternative.c:1642 text_poke_flush arch/x86/kernel/alternative.c:1833 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1840 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:459 jump_label_update+0x39b/0x450 kernel/jump_label.c:830 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:207 static_key_disable+0x1a/0x30 kernel/jump_label.c:215 toggle_allocation_gate+0x36d/0x410 mm/kfence/core.c:780 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287