watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.2.471:2301]
Modules linked in:
CPU: 0 PID: 2301 Comm: syz.2.471 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:36 [inline]
RIP: 0010:skb_release_head_state+0x16e/0x240 net/core/skbuff.c:733
Code: ff ff ff f0 45 0f c1 3e bf 01 00 00 00 44 89 fe e8 f7 eb ae fd 41 83 ff 01 75 16 e8 3c e8 ae fd 4c 89 f7 e8 a4 ca 30 00 eb 1e <e8> 2d e8 ae fd eb 17 bf 01 00 00 00 44 89 fe e8 ce eb ae fd 45 85
RSP: 0018:ffffc90000006eb0 EFLAGS: 00000246
RAX: ffffffff83baf2ee RBX: ffff88811764c640 RCX: ffff888121f15000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000006ed8 R08: ffff88811764c72f R09: 1ffff11022ec98e5
R10: dffffc0000000000 R11: ffffed1022ec98e6 R12: dffffc0000000000
R13: 1ffff11022ec98d3 R14: 0000000000000000 R15: 1ffff11022ec98d4
FS:  00007f9e90d466c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87def90d58 CR3: 000000011b217000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 skb_release_all net/core/skbuff.c:741 [inline]
 __kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb_reason net/core/skbuff.c:778 [inline]
 kfree_skb+0x89/0x2f0 net/core/skbuff.c:792
 kfree_skb_list+0x41/0x70 net/core/skbuff.c:801
 __dev_xmit_skb net/core/dev.c:3969 [inline]
 __dev_queue_xmit+0x1c79/0x2d60 net/core/dev.c:4274
 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355
 br_dev_queue_push_xmit+0x548/0x6e0 net/bridge/br_forward.c:53
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_forward_finish+0xd0/0x230 net/bridge/br_forward.c:66
 NF_HOOK include/linux/netfilter.h:305 [inline]
 __br_forward+0x407/0x520 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver+0x1ca/0x2b0 net/bridge/br_forward.c:190
 br_flood+0x2ea/0x420 net/bridge/br_forward.c:232
 br_dev_xmit+0xc57/0x1090 net/bridge/br_device.c:104
 __netdev_start_xmit include/linux/netdevice.h:5061 [inline]
 netdev_start_xmit include/linux/netdevice.h:5075 [inline]
 xmit_one net/core/dev.c:3670 [inline]
 dev_hard_start_xmit+0x245/0x680 net/core/dev.c:3686
 __dev_queue_xmit+0x17a3/0x2d60 net/core/dev.c:4313
 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355
 neigh_resolve_output+0x6c4/0x770 net/core/neighbour.c:1504
 neigh_output include/net/neighbour.h:517 [inline]
 ip_finish_output2+0xb86/0xec0 net/ipv4/ip_output.c:228
 __ip_finish_output+0x163/0x360 net/ipv4/ip_output.c:-1
 ip_finish_output+0x31/0x220 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x1ea/0x390 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:453 [inline]
 ip_local_out+0x98/0xb0 net/ipv4/ip_output.c:126
 igmpv3_sendpack net/ipv4/igmp.c:431 [inline]
 igmpv3_send_cr net/ipv4/igmp.c:727 [inline]
 igmp_ifc_timer_expire+0xa1c/0xe70 net/ipv4/igmp.c:817
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1459
 expire_timers kernel/time/timer.c:1504 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1775
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1788
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__kasan_slab_alloc+0xce/0xe0 mm/kasan/common.c:469
Code: 68 22 00 00 4c 89 ff be 40 00 00 00 31 d2 e8 19 92 b0 ff 4c 89 ff 89 c6 44 89 f2 b9 01 00 00 00 e8 37 60 c5 00 41 89 44 24 04 <48> 89 d8 48 8d 65 e0 5b 41 5c 41 5e 41 5f 5d c3 66 90 55 48 89 e5
RSP: 0018:ffffc90000cc7560 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88812163c000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffed10242c7900
RBP: ffffc90000cc7788 R08: ffffc90000cc7810 R09: ffffed10242c7800
R10: dffffc0000000000 R11: ffffed1021589414 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000cc0 R15: ffff888100043200
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc_trace+0xfb/0x270 mm/slub.c:3272
 kmalloc include/linux/slab.h:619 [inline]
 kmalloc_array include/linux/slab.h:658 [inline]
 netdev_create_hash net/core/dev.c:11486 [inline]
 netdev_init+0x97/0x1f0 net/core/dev.c:11502
 ops_init+0x2c0/0x470 net/core/net_namespace.c:138
 setup_net+0x331/0xa30 net/core/net_namespace.c:332
 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:476
 create_new_namespaces+0x3a8/0x660 kernel/nsproxy.c:110
 copy_namespaces+0x1cc/0x220 kernel/nsproxy.c:178
 copy_process+0x1161/0x3230 kernel/fork.c:2358
 kernel_clone+0x233/0x960 kernel/fork.c:2744
 __do_sys_clone kernel/fork.c:2870 [inline]
 __se_sys_clone kernel/fork.c:2854 [inline]
 __x64_sys_clone+0x198/0x210 kernel/fork.c:2854
 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 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: 0033:0x7f9e922ed159
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:00007f9e90d45fd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f9e92574fa0 RCX: 00007f9e922ed159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0126080
RBP: 00007f9e9238406b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f9e92575038 R14: 00007f9e92574fa0 R15: 00007ffeb3a81e38
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729