INFO: rcu detected stall in fib_nl

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	INFO: rcu detected stall in fib_nl_newrule	1				1	325d	325d	0/3	auto-obsoleted due to no activity on 2025/01/21 15:53
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=ce5/1/0x4000000000000002 softirq=15832/15833 fqs=5245 
	(detected by 1, t=10502 jiffies, g=20289, q=1578)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7189 Comm: syz.9.677 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:irq_work_run_list+0xd3/0x330 kernel/irq_work.c:176
Code: 3c 28 00 74 08 48 89 df e8 8a 98 38 00 48 83 3b 00 0f 84 21 02 00 00 48 89 df be 08 00 00 00 e8 13 9a 38 00 45 31 f6 4c 87 33 <4d> 85 f6 0f 84 0c 02 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74
RSP: 0018:ffffc900000075e0 EFLAGS: 00000046
RAX: 1ffff11017206701 RBX: ffff8880b9033d30 RCX: ffffffff8183986d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8880b9033d30
RBP: ffffc90000007698 R08: dffffc0000000000 R09: ffffed10172067a7
R10: ffffed10172067a7 R11: 1ffff110172067a6 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880b903b1b0 R15: 0000000000000000
FS:  00007f63358056c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555805f55c8 CR3: 0000000078217000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 irq_work_run+0x63/0xe0 kernel/irq_work.c:186
 __sysvec_irq_work+0x98/0x240 arch/x86/kernel/irq_work.c:22
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 dd 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000077a0 EFLAGS: 00000206
RAX: cbbd05e51a063600 RBX: 1ffff92000000ef8 RCX: cbbd05e51a063600
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: ffffffff8a59a240
RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff761a
R10: fffffbfff1ff761a R11: 1ffffffff1ff7619 R12: ffffffff8c120900
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 netif_receive_skb_list_internal+0x93a/0xb90 net/core/dev.c:5760
 gro_normal_list net/core/dev.c:5913 [inline]
 napi_complete_done+0x37d/0x830 net/core/dev.c:6651
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0x912/0xef0 drivers/net/virtio_net.c:1624
 __napi_poll+0xc0/0x430 net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x4a8/0x9c0 net/core/dev.c:7232
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 common_interrupt+0xb5/0xd0 arch/x86/kernel/irq.c:242
 </IRQ>
 <TASK>
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667
RIP: 0010:preempt_schedule_irq+0xac/0x150 kernel/sched/core.c:6799
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 70 bf 01 00 00 00 e8 ff 37 a0 f7 e8 aa b0 cc f7 fb bf 01 00 00 00 <e8> ef b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000312ec00 EFLAGS: 00000286
RAX: cbbd05e51a063600 RBX: 0000000000000000 RCX: cbbd05e51a063600
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: 0000000000000001
RBP: ffffc9000312eca0 R08: dffffc0000000000 R09: fffffbfff1ff761a
R10: fffffbfff1ff761a R11: 1ffffffff1ff7619 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000625d80
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:vprintk_store+0xe94/0x10d0 kernel/printk/printk.c:2237
Code: 18 00 fb 45 31 ff eb 19 e8 49 a9 18 00 e8 74 cc 49 08 4d 85 ed 0f 84 d8 fe ff ff e8 36 a9 18 00 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 34 00 00 00 00 4b c7 44 34 09 00 00 00 00 4b c7 44 34 14
RSP: 0018:ffffc9000312ed60 EFLAGS: 00000283
RAX: ffffffff815f217a RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d501000 RSI: 0000000000030230 RDI: 0000000000030231
RBP: ffffc9000312ef70 R08: dffffc0000000000 R09: fffffbfff1ff761a
R10: fffffbfff1ff761a R11: 1ffffffff1ff7619 R12: 1ffff92000625db8
R13: 0000000000000200 R14: dffffc0000000000 R15: 000000000000004e
 vprintk_emit+0x85/0x150 kernel/printk/printk.c:2258
 _printk+0xcc/0x110 kernel/printk/printk.c:2299
 __nla_validate_parse+0x1f2d/0x2750 lib/nlattr.c:603
 __nla_parse+0x3c/0x50 lib/nlattr.c:688
 __nlmsg_parse include/net/netlink.h:733 [inline]
 nlmsg_parse_deprecated include/net/netlink.h:772 [inline]
 fib_nl_newrule+0x304/0x1d80 net/core/fib_rules.c:776
 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650
 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x29c/0x380 net/socket.c:1079
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x712/0xd00 fs/read_write.c:594
 ksys_write+0x14d/0x250 fs/read_write.c:647
 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: 0033:0x7f633759dbe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6335805038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f63377d4fa0 RCX: 00007f633759dbe9
RDX: 0000000000033fe0 RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f6337620e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63377d5038 R14: 00007f63377d4fa0 R15: 00007ffc8dac4f18
 </TASK>