bridge0: received packet on vlan0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18810/1:b..l
rcu: (detected by 1, t=10563 jiffies, g=112025, q=107889 ncpus=2)
task:syz.0.3272 state:R running task stack:28032 pid:18810 tgid:18809 ppid:5626 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7276
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7598
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__read_once_word_nocheck+0x0/0x10 include/asm-generic/rwonce.h:67
Code: 89 e7 e8 63 a9 bf 00 e9 1e fd ff ff 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> 8b 07 c3 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90
RSP: 0018:ffffc9000533f510 EFLAGS: 00000202
RAX: ffffc9000533fc01 RBX: 1ffff92000a67ec1 RCX: 0000000000000001
RDX: ffffc9000533f648 RSI: dffffc0000000000 RDI: ffffc9000533fcb0
RBP: ffffc90005338000 R08: ffffc9000533fcb0 R09: 0000000000000000
R10: ffffc9000533f658 R11: fffff52000a67ecd R12: 1ffff92000a67ec2
R13: 1ffff92000a67ec3 R14: ffffc90005340000 R15: dffffc0000000000
deref_stack_reg+0x18e/0x220 arch/x86/kernel/unwind_orc.c:422
unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_noprof+0x36b/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
fib_default_rule_add+0x4c/0x380 net/core/fib_rules.c:60
fib_default_rules_init net/ipv4/fib_rules.c:492 [inline]
fib4_rules_init+0x48/0x160 net/ipv4/fib_rules.c:513
ip_fib_net_init net/ipv4/fib_frontend.c:1601 [inline]
fib_net_init+0x19c/0x410 net/ipv4/fib_frontend.c:1647
ops_init+0x35d/0x5d0 net/core/net_namespace.c:137
setup_net+0x118/0x350 net/core/net_namespace.c:443
copy_net_ns+0x53b/0x780 net/core/net_namespace.c:582
create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0x149/0x190 kernel/nsproxy.c:234
ksys_unshare+0x5a7/0x950 kernel/fork.c:3292
__do_sys_unshare kernel/fork.c:3356 [inline]
__se_sys_unshare kernel/fork.c:3354 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3354
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: 0033:0x7fb3c9b9e159
RSP: 002b:00007fb3cab1e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fb3c9e25fa0 RCX: 00007fb3c9b9e159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fb3c9c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3c9e26038 R14: 00007fb3c9e25fa0 R15: 00007ffc3c1ea478
rcu: rcu_preempt kthread starved for 339 jiffies! g112025 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7368
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
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: 9942 Comm: kworker/u8:18 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: krds_cp_wq#12/1 rds_connect_worker
RIP: 0010:in_softirq_really kernel/kcov.c:167 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:179 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:242 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x7d/0x110 kernel/kcov.c:347
Code: 1e cd 11 45 31 c9 eb 0c 49 ff c1 4c 39 c8 0f 84 93 00 00 00 4e 8b 54 ce 10 65 4c 8b 1d 7c 1e cd 11 41 f7 c3 00 01 00 ff 74 2c <44> 89 db 81 e3 00 01 00 0f 81 fb 00 01 00 00 0f 95 c3 41 81 fb 00
RSP: 0018:ffffc90000006f60 EFLAGS: 00000206
RAX: 000000000000000c RBX: 0000000000000100 RCX: 0000000000000005
RDX: ffffffff8abbc881 RSI: ffffffff903b1a20 RDI: 0000000000000002
RBP: 000000009478e7bd R08: ffff88802f6e5dc0 R09: 000000000000000b
R10: 000000000000000c R11: 8000000000000101 R12: 000000009478e7bd
R13: ffff888034b38ec0 R14: ffffc90000007040 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff888124cd1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555f56f4e8 CR3: 000000002a7fa000 CR4: 00000000003526f0
Call Trace:
jhash+0x261/0x750 include/linux/jhash.h:88
rht_key_get_hash include/linux/rhashtable.h:140 [inline]
rht_key_hashfn include/linux/rhashtable.h:152 [inline]
__rhashtable_lookup include/linux/rhashtable.h:629 [inline]
rhashtable_lookup include/linux/rhashtable.h:672 [inline]
rhashtable_lookup_fast include/linux/rhashtable.h:710 [inline]
br_vlan_lookup+0x1f0/0x7a0 net/bridge/br_vlan.c:34
br_vlan_find net/bridge/br_vlan.c:863 [inline]
br_handle_vlan+0xde/0x5a0 net/bridge/br_vlan.c:499
__br_forward+0xbb/0x540 net/bridge/br_forward.c:87
br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:325 [inline]
br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1329/0x1600 net/bridge/br_input.c:451
__netif_receive_skb_core+0x989/0x30c0 net/core/dev.c:6151
__netif_receive_skb_list_core+0x24d/0x830 net/core/dev.c:6339
__netif_receive_skb_list net/core/dev.c:6406 [inline]
netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6497
gro_normal_list include/net/gro.h:523 [inline]
gro_flush_normal include/net/gro.h:531 [inline]
napi_complete_done+0x299/0x730 net/core/dev.c:6865
gro_cell_poll+0x5ff/0x630 net/core/gro_cells.c:76
__napi_poll+0xaa/0x330 net/core/dev.c:7787
napi_poll net/core/dev.c:7850 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8007
handle_softirqs+0x226/0x860 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
lock_sock include/net/sock.h:1713 [inline]
__inet6_bind+0x301/0xf30 net/ipv6/af_inet6.c:292
kernel_bind+0x13e/0x1c0 net/socket.c:3675
rds_tcp_conn_path_connect+0x53b/0x920 net/rds/tcp_connect.c:175
rds_connect_worker+0x1d8/0x290 net/rds/threads.c:176
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245