bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4676/1:b..l P5407/1:b..l rcu: (detected by 1, t=10503 jiffies, g=18961, q=284 ncpus=2) task:udevd state:R running task stack:21664 pid:5407 tgid:5407 ppid:4687 flags:0x00000002 Call Trace: <TASK> context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6997 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:kasan_check_range+0x1b8/0x290 mm/kasan/generic.c:189 Code: 4d 01 fb 48 8d 5d 07 48 85 ed 48 0f 49 dd 48 83 e3 f8 48 29 dd 74 12 41 80 3b 00 0f 85 a6 00 00 00 49 ff c3 48 ff cd 75 ee 5b <41> 5c 41 5e 41 5f 5d c3 cc cc cc cc 40 84 ed 75 5f f7 c5 00 ff 00 RSP: 0018:ffffc9000481f948 EFLAGS: 00000256 RAX: ffffffff8215a501 RBX: ffffffff8215a5cc RCX: ffffffff8215a5cc RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffff888027377c88 RBP: 0000000000000000 R08: ffff888027377c97 R09: 1ffff11004e6ef92 R10: dffffc0000000000 R11: ffffed1004e6ef93 R12: 0000000000000010 R13: 0000000000000002 R14: dffffc0000000001 R15: ffffed1004e6ef93 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 set_root+0x1ec/0x3c0 fs/namei.c:955 nd_jump_root+0x2a6/0x420 fs/namei.c:975 path_init+0x3cd/0x1360 fs/namei.c:2482 path_lookupat+0x27/0x450 fs/namei.c:2570 filename_lookup+0x256/0x610 fs/namei.c:2609 user_path_at+0x3a/0x60 fs/namei.c:3016 do_utimes_path fs/utimes.c:95 [inline] do_utimes+0x112/0x270 fs/utimes.c:145 __do_sys_utimensat fs/utimes.c:164 [inline] __se_sys_utimensat fs/utimes.c:148 [inline] __x64_sys_utimensat+0x14f/0x250 fs/utimes.c:148 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe000719fcc RSP: 002b:00007ffd39fa1998 EFLAGS: 00000202 ORIG_RAX: 0000000000000118 RAX: ffffffffffffffda RBX: 00007ffd39fa1a38 RCX: 00007fe000719fcc RDX: 0000000000000000 RSI: 00007ffd39fa2358 RDI: 00000000ffffff9c RBP: 00007ffd39fa2358 R08: 0000000000000000 R09: 00007ffd39fa1c18 R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd39fa1e38 R13: 00005600864e6430 R14: 00005600864b7270 R15: 00007ffd39fa2366 </TASK> task:klogd state:R running task stack:23104 pid:4676 tgid:4676 ppid:1 flags:0x00000002 Call Trace: <TASK> context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6997 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x18/0x90 kernel/kcov.c:314 Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 c0 d7 03 00 65 8b 05 50 fd 6e 7e <25> 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 74 RSP: 0018:ffffc90003ba7440 EFLAGS: 00000286 RAX: 0000000080000000 RBX: dffffc0000000000 RCX: ffff88807d319e00 RDX: ffff88807d319e00 RSI: 0000000000000000 RDI: 0000000000000040 RBP: dffffc0000000000 R08: ffffffff820b8a08 R09: 1ffffffff285a700 R10: dffffc0000000000 R11: fffffbfff285a701 R12: ffff88801c417890 R13: ffffea0000a12d48 R14: 0000000000000000 R15: 1ffffd40001425a8 __page_table_check_zero+0xd8/0x350 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1109 [inline] free_unref_page+0xd0f/0xf20 mm/page_alloc.c:2674 discard_slab mm/slub.c:2678 [inline] __put_partials+0xeb/0x130 mm/slub.c:3146 put_cpu_partial+0x17c/0x250 mm/slub.c:3221 __slab_free+0x2ea/0x3d0 mm/slub.c:4450 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4265 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4284 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2883 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2027 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:744 __sys_sendto+0x39b/0x4f0 net/socket.c:2209 __do_sys_sendto net/socket.c:2221 [inline] __se_sys_sendto net/socket.c:2217 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2217 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f28ca9339b5 RSP: 002b:00007fffc4b85b68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f28ca9339b5 RDX: 00000000000000a1 RSI: 0000562e16177b40 RDI: 0000000000000003 RBP: 0000562e16170910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007f28caac1212 R14: 00007fffc4b85c68 R15: 0000000000000000 </TASK> rcu: rcu_preempt kthread starved for 10478 jiffies! g18961 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:25888 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+0x15a/0x290 kernel/time/sleep_timeout.c:99 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: CPU: 1 UID: 0 PID: 5354 Comm: kworker/1:7 Not tainted 6.12.0-rc1-next-20241001-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:unwind_next_frame+0x60a/0x22d0 arch/x86/kernel/unwind_orc.c:517 Code: 84 73 0b 00 00 48 83 c3 10 e9 06 02 00 00 83 fb 04 0f 84 0e 02 00 00 83 fb 05 0f 85 e6 09 00 00 48 8b 44 24 58 42 80 3c 20 00 <74> 0d 4c 89 f7 e8 6c 5d bd 00 48 8b 54 24 10 49 8b 06 48 89 04 24 RSP: 0018:ffffc90000a17ab0 EFLAGS: 00000246 RAX: 1ffff92000142f77 RBX: 0000000000000005 RCX: ffffffff908c8c2c RDX: ffffffff913169b8 RSI: ffffffff913169b2 RDI: 0000000000000001 RBP: ffffc90000a17bd0 R08: 0000000000000003 R09: ffffc90000a17c70 R10: ffffc90000a17bd0 R11: ffffffff81808910 R12: dffffc0000000000 R13: ffffc90000a17b80 R14: ffffc90000a17bb8 R15: ffffffff913169bc FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000629bc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142 skb_clone+0x20c/0x390 net/core/skbuff.c:2084 deliver_clone net/bridge/br_forward.c:125 [inline] maybe_deliver+0x96/0x150 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:5556 __netif_receive_skb_one_core net/core/dev.c:5660 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5775 process_backlog+0x662/0x15b0 net/core/dev.c:6107 __napi_poll+0xcb/0x490 net/core/dev.c:6771 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6962 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> bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:32:40:9e:9b:18:1b, vlan:0)