Hello, syzbot found the following issue on: HEAD commit: 1405981bbba0 lib: packing: catch kunit_kzalloc() failure i.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1489bb80580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f95955e3f7b5790c dashboard link: https://syzkaller.appspot.com/bug?extid=c596faae21a68bf7afd0 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17808f9f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/34f62132d43f/disk-1405981b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/872fb3b1af67/vmlinux-1405981b.xz kernel image: https://storage.googleapis.com/syzbot-assets/493188519750/bzImage-1405981b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c596faae21a68bf7afd0@xxxxxxxxxxxxxxxxxxxxxxxxx bridge0: received packet on veth0_to_bridge with own address as source address (addr:6e:a5:51:5e:bc:50, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=8089, q=1074 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 8424 (4294972116-4294963692), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 8425 jiffies! g8089 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:25952 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5350 Comm: kworker/0:3 Not tainted 6.12.0-rc1-syzkaller-00242-g1405981bbba0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:task_tick_fair+0x282/0x7c0 kernel/sched/fair.c:13046 Code: 89 e7 e8 01 d3 96 00 4d 39 34 24 75 60 48 81 c3 78 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 de d2 96 00 <48> 8b 3b 83 7c 24 08 00 74 07 e8 9f 6f fb ff eb 0c 48 81 c7 40 0d RSP: 0018:ffffc900000067c8 EFLAGS: 00000046 RAX: 1ffff110170c7d97 RBX: ffff8880b863ecb8 RCX: 000000000008c5a2 RDX: 000000000008c5a2 RSI: dffffc0000000000 RDI: ffff8880b863eb54 RBP: ffff888071fc5b28 R08: ffffffff901ce76f R09: 1ffffffff2039ced R10: dffffc0000000000 R11: ffffffff8167b790 R12: ffff888071fc5a80 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e57107ab8 CR3: 0000000077f18000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> sched_tick+0x219/0x610 kernel/sched/core.c:5593 update_process_times+0x202/0x230 kernel/time/timer.c:2524 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x551/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:trace_kmem_cache_alloc+0x18/0xc0 include/trace/events/kmem.h:12 Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 65 8b 05 f3 54 11 7e 83 f8 08 73 23 89 c0 48 0f a3 05 80 64 2a 0e <73> 12 e8 21 41 88 ff 84 c0 75 09 f6 05 0a 22 14 0e 01 74 0b c3 cc RSP: 0018:ffffc90000006c80 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8881a6f96d00 RCX: 0000000000000820 RDX: ffff888141ae13c0 RSI: ffff8881a6f96d00 RDI: ffffffff898d7336 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: ffff8881a6f96d00 R11: ffffffff81808f50 R12: 00000000000000b8 R13: ffff888141ae13c0 R14: 0000000000000820 R15: ffffffff898d7336 kmem_cache_alloc_noprof+0x185/0x2a0 mm/slub.c:4145 skb_ext_maybe_cow net/core/skbuff.c:6942 [inline] skb_ext_add+0x1d6/0x910 net/core/skbuff.c:7016 nf_bridge_unshare net/bridge/br_netfilter_hooks.c:168 [inline] br_nf_forward_ip+0xd8/0x7b0 net/bridge/br_netfilter_hooks.c:710 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x2a7/0x460 include/linux/netfilter.h:312 __br_forward+0x489/0x660 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190 br_flood+0x2e4/0x660 net/bridge/br_forward.c:236 br_handle_frame_finish+0x18ba/0x1fe0 net/bridge/br_input.c:215 br_nf_hook_thresh+0x472/0x590 br_nf_pre_routing_finish_ipv6+0xaa0/0xdd0 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x379/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5560 __netif_receive_skb_one_core net/core/dev.c:5664 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5779 process_backlog+0x662/0x15b0 net/core/dev.c:6111 __napi_poll+0xcb/0x490 net/core/dev.c:6775 napi_poll net/core/dev.c:6844 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6966 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 </IRQ> <TASK> __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> net_ratelimit: 22358 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:6e:a5:51:5e:bc:50, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e3:c2:99:e2:22, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
