IPVS: sh: UDP 224.0.0.2:0 - no destination available ============================= [ BUG: Invalid wait context ] syzkaller #0 Tainted: G L ----------------------------- syz.0.751/8321 is trying to lock: ffff888053fde9e8 (blk_probe_mutex){+.+.}-{4:4}, at: spin_lock include/linux/spinlock.h:347 [inline] ffff888053fde9e8 (blk_probe_mutex){+.+.}-{4:4}, at: tcp_tsq_handler+0x29/0x200 net/ipv4/tcp_output.c:1291 other info that might help us debug this: context-{3:3} locks held by syz.0.751/8321: 2, last CPU#1: #0: ffff88801b069540 ((wq_completion)events_bh){+.-.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff88801b069540 ((wq_completion)events_bh){+.-.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff88801b069540 ((wq_completion)events_bh){+.-.}-{0:0}, at: process_one_work kernel/workqueue.c:3352 [inline] #0: ffff88801b069540 ((wq_completion)events_bh){+.-.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3470 #1: ffffc90000a08de0 ((work_completion)(&tsq->work)){+.-.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #1: ffffc90000a08de0 ((work_completion)(&tsq->work)){+.-.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #1: ffffc90000a08de0 ((work_completion)(&tsq->work)){+.-.}-{0:0}, at: process_one_work kernel/workqueue.c:3352 [inline] #1: ffffc90000a08de0 ((work_completion)(&tsq->work)){+.-.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3470 stack backtrace: CPU: 1 UID: 0 PID: 8321 Comm: syz.0.751 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_lock_invalid_wait_context kernel/locking/lockdep.c:4846 [inline] check_wait_context kernel/locking/lockdep.c:4918 [inline] __lock_acquire+0xe39/0x2cf0 kernel/locking/lockdep.c:5203 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5886 __raw_spin_lock include/linux/spinlock_api_smp.h:190 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173 spin_lock include/linux/spinlock.h:347 [inline] tcp_tsq_handler+0x29/0x200 net/ipv4/tcp_output.c:1291 tcp_tsq_workfn+0x384/0x410 net/ipv4/tcp_output.c:1325 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 bh_worker+0x451/0x870 kernel/workqueue.c:3773 tasklet_action+0xc/0x70 kernel/softirq.c:997 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:tcp_wfree+0x4ab/0x580 net/ipv4/tcp_output.c:1429 Code: 00 75 79 e8 37 e1 7a f7 48 bb 00 00 00 00 00 fc ff df 4d 85 ed 75 07 e8 23 e1 7a f7 eb 06 e8 1c e1 7a f7 fb 41 c6 44 1e 04 f8 <48> c7 44 24 40 0e 36 e0 45 49 c7 04 1e 00 00 00 00 65 48 8b 05 a4 RSP: 0018:ffffc90004e2f320 EFLAGS: 00000283 RAX: ffffffff8a4c4c64 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc90005ee9000 RSI: 00000000000026df RDI: 00000000000026e0 RBP: ffffc90004e2f3f0 R08: ffffffff9079bb3f R09: 1ffffffff20f3767 R10: dffffc0000000000 R11: fffffbfff20f3768 R12: ffff888053fdf298 R13: 0000000000000200 R14: 1ffff920009c5e6c R15: ffff8880b87398f0 skb_release_head_state+0x11b/0x370 net/core/skbuff.c:1176 skb_release_all net/core/skbuff.c:1195 [inline] __kfree_skb+0x24/0x210 net/core/skbuff.c:1211 kfree_skb_reason include/linux/skbuff.h:1323 [inline] kfree_skb include/linux/skbuff.h:1332 [inline] __rtnl_unlock+0x95/0xf0 net/core/rtnetlink.c:148 netdev_run_todo+0x2e5/0x1060 net/core/dev.c:11776 rtnl_unlock net/core/rtnetlink.c:157 [inline] rtnetlink_rcv_msg+0xa8d/0xc00 net/core/rtnetlink.c:7142 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f697b19e0d9 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:00007f697c029028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f697b426090 RCX: 00007f697b19e0d9 RDX: 000000000000c010 RSI: 0000200000000280 RDI: 0000000000000009 RBP: 00007f697b235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f697b426128 R14: 00007f697b426090 R15: 00007f697b54fa48 IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available IPVS: sh: UDP 224.0.0.2:0 - no destination available ---------------- Code disassembly (best guess): 0: 00 75 79 add %dh,0x79(%rbp) 3: e8 37 e1 7a f7 call 0xf77ae13f 8: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx f: fc ff df 12: 4d 85 ed test %r13,%r13 15: 75 07 jne 0x1e 17: e8 23 e1 7a f7 call 0xf77ae13f 1c: eb 06 jmp 0x24 1e: e8 1c e1 7a f7 call 0xf77ae13f 23: fb sti 24: 41 c6 44 1e 04 f8 movb $0xf8,0x4(%r14,%rbx,1) * 2a: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp) <-- trapping instruction 31: e0 45 33: 49 c7 04 1e 00 00 00 movq $0x0,(%r14,%rbx,1) 3a: 00 3b: 65 gs 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 05 .byte 0x5 3f: a4 movsb %ds:(%rsi),%es:(%rdi)