[v6.6] INFO: rcu detected stall in fib_nl_newrule

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 9760bf04666d Linux 6.6.135
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=102b51ba580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=e230e4672333a377c825
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/33c29b12edc9/disk-9760bf04.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a47e841e1ee9/vmlinux-9760bf04.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ef3e43dc5483/bzImage-9760bf04.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e230e4...@syzkaller.appspotmail.com

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 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:f6:bf:e1:b8:44:26, vlan:0)
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (10398 ticks this GP) idle=7764/1/0x4000000000000000 softirq=34740/34742 fqs=5242
rcu: hardirqs softirqs csw/system
rcu: number: 1367592 405 0
rcu: cputime: 46739 5500 263 ==> 52480(ms)
rcu: (t=10500 jiffies g=46045 q=1799 ncpus=2)
CPU: 1 PID: 12552 Comm: syz.2.1862 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 1c f6 03 0d 48 89 de 5b e9 d3 67 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d b0 93 7c 7e 65 8b 15 b1 93 7c
RSP: 0018:ffffc900001ef3f0 EFLAGS: 00000202
RAX: ffffffff813b54d7 RBX: 0000000000000101 RCX: 0000000000000100
RDX: ffff888022251e00 RSI: 0000000000000101 RDI: 0000000000000000
RBP: ffffc900001efe60 R08: ffff888022251e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001ef4c8
R13: dffffc0000000000 R14: ffffc900001eff80 R15: ffffc900001ef4d8
FS: 00007f3b448806c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d61dff8 CR3: 0000000026ab8000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
Call Trace:
<IRQ>
unwind_next_frame+0x1d24/0x2970 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x270 mm/slub.c:3852
skb_ext_del include/linux/skbuff.h:4830 [inline]
nf_bridge_info_free net/bridge/br_netfilter_hooks.c:152 [inline]
br_nf_dev_queue_xmit+0x492/0x1b80 net/bridge/br_netfilter_hooks.c:-1
NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
br_nf_post_routing+0xb41/0xfb0 net/bridge/br_netfilter_hooks.c:977
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1184 [inline]
br_nf_forward_finish+0xa51/0xe80 net/bridge/br_netfilter_hooks.c:684
NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
br_nf_forward_ip+0xcc1/0x1110 net/bridge/br_netfilter_hooks.c:754
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
__br_forward+0x433/0x610 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:191
br_flood+0x31b/0x670 net/bridge/br_forward.c:237
br_handle_frame_finish+0x13c5/0x18f0 net/bridge/br_input.c:215
br_nf_hook_thresh+0x3cd/0x4a0 net/bridge/br_netfilter_hooks.c:1184
br_nf_pre_routing_finish_ipv6+0x9dc/0xd00 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:304 [inline]
br_nf_pre_routing_ipv6+0x349/0x6b0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
br_handle_frame+0x1245/0x14d0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfab/0x3af0 net/core/dev.c:5540
__netif_receive_skb_one_core net/core/dev.c:5644 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5760
process_backlog+0x391/0x6f0 net/core/dev.c:6088
__napi_poll+0xc0/0x460 net/core/dev.c:6650
napi_poll net/core/dev.c:6717 [inline]
net_rx_action+0x616/0xc40 net/core/dev.c:6853
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x89/0x290 mm/kasan/generic.c:187
Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd
RSP: 0018:ffffc900197964e8 EFLAGS: 00000246
RAX: ffffc90019796601 RBX: ffffffffffffffff RCX: ffffffff816c464d
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d018c38
RBP: ffffc900197966e0 R08: ffffffff8d018c3f R09: 1ffffffff1a03187
R10: dffffc0000000000 R11: fffffbfff1a03187 R12: 0000000000000001
R13: dffffc0000000000 R14: fffffbfff1a03188 R15: 1ffffffff1a03187
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:3160 [inline]
prb_read kernel/printk/printk_ringbuffer.c:1808 [inline]
_prb_read_valid+0x22d/0xad0 kernel/printk/printk_ringbuffer.c:1891
prb_read_valid+0x3d/0x60 kernel/printk/printk_ringbuffer.c:1940
printk_get_next_message+0x190/0x980 kernel/printk/printk.c:2850
console_emit_next_record kernel/printk/printk.c:2911 [inline]
console_flush_all+0x3a8/0xd20 kernel/printk/printk.c:3000
console_unlock+0xad/0x350 kernel/printk/printk.c:3069
vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
_printk+0xde/0x130 kernel/printk/printk.c:2366
__nla_validate_parse+0x2672/0x2ea0 lib/nlattr.c:647
__nla_parse+0x40/0x50 lib/nlattr.c:732
__nlmsg_parse include/net/netlink.h:756 [inline]
nlmsg_parse_deprecated include/net/netlink.h:797 [inline]
fib_nl_newrule+0x333/0x1dc0 net/core/fib_rules.c:797
rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6475
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2686 [inline]
__se_sys_sendmsg+0x1c2/0x2b0 net/socket.c:2684
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3b4399c819
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:00007f3b44880028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3b43c15fa0 RCX: 00007f3b4399c819
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f3b43a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b43c16038 R14: 00007f3b43c15fa0 R15: 00007ffebdfed078
</TASK>
net_ratelimit: 268 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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)
net_ratelimit: 244 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 261 callbacks suppressed
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:f6:bf:e1:b8:44:26, 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 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, vlan:0)
net_ratelimit: 289 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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)
net_ratelimit: 270 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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)
net_ratelimit: 265 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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 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:f6:bf:e1:b8:44:26, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
NMI backtrace for cpu 1
CPU: 1 PID: 12552 Comm: syz.2.1862 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__kasan_check_read+0x0/0x20 mm/kasan/shadow.c:31
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 48 c7 c7 a5 a1 a2 8c 4c 89 e6 eb 0a 48 c7 c7 11 76 84 8c 48 89 de e8 55 61 9b 08 31 ed eb d4 cc <f3> 0f 1e fa 89 f6 48 8b 0c 24 31 d2 e9 df ea ff ff 66 2e 0f 1f 84
RSP: 0018:ffffc900001eee18 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff888022251e00 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff911c5508
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2238aa1
R10: dffffc0000000000 R11: fffffbfff2238aa2 R12: 0000000000000002
R13: dffffc0000000000 R14: ffff888022252a48 R15: 0000000000000051
FS: 00007f3b448806c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d61dff8 CR3: 0000000026ab8000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
Call Trace:
<IRQ>
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
hlock_class kernel/locking/lockdep.c:228 [inline]
mark_lock+0x94/0x320 kernel/locking/lockdep.c:4656
mark_usage kernel/locking/lockdep.c:4555 [inline]
__lock_acquire+0xc69/0x7d40 kernel/locking/lockdep.c:5091
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
seqcount_lockdep_reader_access+0xd1/0x1d0 include/linux/seqlock.h:102
ktime_get_update_offsets_now+0x48/0x3f0 kernel/time/timekeeping.c:2317
hrtimer_update_base kernel/time/hrtimer.c:661 [inline]
hrtimer_interrupt+0x5dd/0x9c0 kernel/time/hrtimer.c:1908
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:veth_xmit+0x20c/0x9f0 drivers/net/veth.c:367
Code: e8 a9 81 cd fb 39 dd 0f 86 cc 00 00 00 4d 8d a5 98 0c 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 94 b7 25 fc <49> 8b 2c 24 89 d8 4c 69 e0 c0 03 00 00 4a 8d 9c 25 88 01 00 00 48
RSP: 0018:ffffc900001ef550 EFLAGS: 00000246
RAX: 1ffff1100f134993 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff888022251e00 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000002 R08: dffffc0000000000 R09: 1ffffffff2238aa0
R10: dffffc0000000000 R11: fffffbfff2238aa1 R12: ffff8880789a4c98
R13: ffff8880789a4000 R14: dffffc0000000000 R15: ffff88807a497b40
__netdev_start_xmit include/linux/netdevice.h:4943 [inline]
netdev_start_xmit include/linux/netdevice.h:4957 [inline]
xmit_one net/core/dev.c:3644 [inline]
dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3660
__dev_queue_xmit+0x19a3/0x3660 net/core/dev.c:4454
dev_queue_xmit include/linux/netdevice.h:3113 [inline]
br_dev_queue_push_xmit+0x6b3/0x870 net/bridge/br_forward.c:53
NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
br_nf_post_routing+0xb41/0xfb0 net/bridge/br_netfilter_hooks.c:977
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1184 [inline]
br_nf_forward_finish+0xa51/0xe80 net/bridge/br_netfilter_hooks.c:684
NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
br_nf_forward_ip+0xcc1/0x1110 net/bridge/br_netfilter_hooks.c:754
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
__br_forward+0x433/0x610 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:191
br_flood+0x31b/0x670 net/bridge/br_forward.c:237
br_handle_frame_finish+0x13c5/0x18f0 net/bridge/br_input.c:215
br_nf_hook_thresh+0x3cd/0x4a0 net/bridge/br_netfilter_hooks.c:1184
br_nf_pre_routing_finish_ipv6+0x9dc/0xd00 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:304 [inline]
br_nf_pre_routing_ipv6+0x349/0x6b0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
br_handle_frame+0x1245/0x14d0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfab/0x3af0 net/core/dev.c:5540
__netif_receive_skb_one_core net/core/dev.c:5644 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5760
process_backlog+0x391/0x6f0 net/core/dev.c:6088
__napi_poll+0xc0/0x460 net/core/dev.c:6650
napi_poll net/core/dev.c:6717 [inline]
net_rx_action+0x616/0xc40 net/core/dev.c:6853
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:number+0xb5f/0xf60 lib/vsprintf.c:561
Code: 73 b8 eb c2 89 d9 80 e1 07 38 c1 7c d7 48 89 df e8 e6 58 68 f7 eb cd e8 0f 21 10 f7 eb 08 e8 08 21 10 f7 49 ff c6 41 8d 77 ff <bf> ff ff ff ff e8 a7 24 10 f7 41 ff cf 49 bd 00 00 00 00 00 fc ff
RSP: 0018:ffffc90019796280 EFLAGS: 00000246
RAX: ffffffff8a7700f1 RBX: 00000000fffffffd RCX: 0000000000080000
RDX: ffffc9000d73c000 RSI: 0000000000000000 RDI: 0000000000080000
RBP: ffffc90019796388 R08: ffffc90019796317 R09: 0000000000000000
R10: ffffc90019796300 R11: fffff520032f2c63 R12: ffffffffffffffff
R13: 0000000000000001 R14: ffffc90019796561 R15: 0000000000000001
vsnprintf+0x14c6/0x1ba0 lib/vsprintf.c:2889
snprintf+0xe9/0x140 lib/vsprintf.c:2958
print_caller kernel/printk/printk.c:1336 [inline]
info_print_prefix+0x1fe/0x360 kernel/printk/printk.c:1355
record_print_text+0x177/0x450 kernel/printk/printk.c:1402
printk_get_next_message+0x2ab/0x980 kernel/printk/printk.c:2876
console_emit_next_record kernel/printk/printk.c:2911 [inline]
console_flush_all+0x3a8/0xd20 kernel/printk/printk.c:3000
console_unlock+0xad/0x350 kernel/printk/printk.c:3069
vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
_printk+0xde/0x130 kernel/printk/printk.c:2366
__nla_validate_parse+0x2672/0x2ea0 lib/nlattr.c:647
__nla_parse+0x40/0x50 lib/nlattr.c:732
__nlmsg_parse include/net/netlink.h:756 [inline]
nlmsg_parse_deprecated include/net/netlink.h:797 [inline]
fib_nl_newrule+0x333/0x1dc0 net/core/fib_rules.c:797
rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6475
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2686 [inline]
__se_sys_sendmsg+0x1c2/0x2b0 net/socket.c:2684
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3b4399c819
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:00007f3b44880028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3b43c15fa0 RCX: 00007f3b4399c819
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f3b43a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b43c16038 R14: 00007f3b43c15fa0 R15: 00007ffebdfed078
</TASK>
net_ratelimit: 255 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 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:f6:bf:e1:b8:44:26, 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 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 5500 callbacks suppressed
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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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 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:f6:bf:e1:b8:44:26, vlan:0)
net_ratelimit: 5580 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:f6:bf:e1:b8:44:26, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:bf:e1:b8:44:26, 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)


---
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 syzk...@googlegroups.com.

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 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