INFO: rcu detected stall in rtnl_setlink

Status: upstream: reported on 2026/06/13 18:38
Reported-by: syzbot+6c98b89b805fbe7f4ad4@syzkaller.appspotmail.com
First crash: 61d, last: 23d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: rcu detected stall in rtnl_setlink (2) 1 1 261d 261d 0/3 auto-obsoleted due to no activity on 2026/03/05 21:41
upstream INFO: rcu detected stall in rtnl_setlink (2) net 1 1 477d 477d 0/29 auto-obsoleted due to no activity on 2025/07/22 03:11
upstream INFO: rcu detected stall in rtnl_setlink batman 1 1 1807d 1807d 0/29 auto-closed as invalid on 2021/11/30 03:45
linux-5.15 INFO: rcu detected stall in rtnl_setlink origin:lts-only 1 syz, C inconclusive 16 888d 1050d 0/3 auto-obsoleted due to no activity on 2024/10/03 07:39
linux-5.15 INFO: rcu detected stall in rtnl_setlink (3) 1 1 11h25m 11h25m 0/3 upstream: reported on 2026/08/13 12:25
upstream INFO: rcu detected stall in rtnl_setlink (3) net 1 1 239d 239d 0/29 auto-obsoleted due to no activity on 2026/03/17 00:18
linux-4.14 BUG: soft lockup in rtnl_setlink 1 1 1553d 1553d 0/1 auto-obsoleted due to no activity on 2022/09/10 23:34
android-5-15 BUG: soft lockup in rtnl_setlink 1 1 837d 837d 0/2 auto-obsoleted due to no activity on 2024/07/27 10:01

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2687 jiffies s: 206297 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 835 Comm: syz.1.7399 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:60 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x4e/0x290 mm/kasan/generic.c:189
Code: e8 2f 41 81 f8 ff ff 01 00 0f 82 fa 01 00 00 49 bc 01 00 00 00 00 fc ff df 49 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df <4f> 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 21 49 89
RSP: 0018:ffffc900001e0268 EFLAGS: 00000802
RAX: ffffffff818e7001 RBX: ffff8880b8f3bbf0 RCX: ffffffff818e70ab
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b8f3bbf8
RBP: 0000000000000001 R08: 000000000001ffff R09: 1ffffffff1c42435
R10: dffffc0000000000 R11: fffffbfff1c42436 R12: dffffc0000000001
R13: dffffc0000000001 R14: 1ffff110171e777f R15: dffffc0000000000
FS:  00007f49e4af66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f645799d000 CR3: 000000002b712000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 __irq_work_queue_local+0x2b/0x190 kernel/irq_work.c:85
 irq_work_queue_on+0x13c/0x260 kernel/irq_work.c:165
 rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 52 82 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0760 EFLAGS: 00000206
RAX: 9107c2e04492db00 RBX: 1ffff9200003c0f4 RCX: 9107c2e04492db00
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf42e0
RBP: ffffc900001e0860 R08: ffffffff90b10337 R09: 1ffffffff2162066
R10: dffffc0000000000 R11: fffffbfff2162067 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ndisc_send_skb+0xdc2/0x1520 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:vlan_device_event+0x796/0x1e20 net/8021q/vlan.c:430
Code: 7c 24 08 4c 89 fe e8 99 06 c8 fe eb 13 e8 a2 2d 14 f8 eb 16 e8 9b 2d 14 f8 eb 0f e8 94 2d 14 f8 49 bc 00 00 00 00 00 fc ff df <81> fb ff 1f 00 00 74 22 e8 7d 2d 14 f8 ff c3 e9 2a ff ff ff 44 89
RSP: 0018:ffffc90003946a80 EFLAGS: 00000283
RAX: ffffffff896df3fe RBX: 0000000000001410 RCX: 0000000000080000
RDX: ffffc9000fadd000 RSI: 0000000000023c07 RDI: 0000000000023c08
RBP: ffffc90003946ba0 R08: ffff8880310c203f R09: 1ffff11006218407
R10: dffffc0000000000 R11: ffffed1006218408 R12: dffffc0000000000
R13: 0000000000000004 R14: 0000000000000000 R15: ffff888063140670
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 __dev_notify_flags+0x243/0x310 net/core/dev.c:8729
 dev_change_flags+0xda/0x1a0 net/core/dev.c:8753
 do_setlink+0xbc7/0x29c0 net/core/rtnetlink.c:2837
 rtnl_setlink+0x37e/0x510 net/core/rtnetlink.c:3128
 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6158
 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f49e3b9de99
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:00007f49e4af6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f49e3e26090 RCX: 00007f49e3b9de99
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000011
RBP: 00007f49e3c33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f49e3e26128 R14: 00007f49e3e26090 R15: 00007ffd1afe98c8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/21 09:09 linux-6.1.y 090666d3cc90 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in rtnl_setlink
2026/06/13 18:37 linux-6.1.y 228da13e907e 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in rtnl_setlink
* Struck through repros no longer work on HEAD.