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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: 3d16h, last: 3d16h
▶ ▼ Similar bugs (7)
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 203d 203d 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 420d 420d 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 1750d 1750d 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 C inconclusive 16 831d 993d 0/3 auto-obsoleted due to no activity on 2024/10/03 07:39
upstream INFO: rcu detected stall in rtnl_setlink (3) net 1 1 182d 182d 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 1495d 1495d 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 780d 780d 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-.... } 2652 jiffies s: 62897 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: 19703 Comm: syz.5.4965 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5400 [inline]
RIP: 0010:lock_is_held_type+0xb4/0x190 kernel/locking/lockdep.c:5705
Code: df 49 81 c7 e0 0a 00 00 45 31 e4 49 83 fc 31 73 24 4c 89 ff 4c 89 f6 e8 2a 02 00 00 85 c0 75 2a 49 ff c4 48 63 83 d8 0a 00 00 <49> 83 c7 28 49 39 c4 7c d8 eb 11 48 c7 c7 60 c1 9f 8c 4c 89 e6 e8
RSP: 0018:ffffc900001e0758 EFLAGS: 00000002
RAX: 0000000000000004 RBX: ffff88802b729e00 RCX: 0000000000000000
RDX: ffff88802b729e00 RSI: ffffffff8cb2de60 RDI: ffff88802b72a8e0
RBP: 00000000ffffffff R08: dffffc0000000000 R09: 1ffffffff215fe48
R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 0000000000000001
R13: 0000000000000046 R14: ffffffff8cb2de60 R15: ffff88802b72a8e0
FS:  00007f3d7e9136c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb214017dac CR3: 00000000827fc000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 trace_call_bpf+0x19e/0x6b0 kernel/trace/bpf_trace.c:135
 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 82 30 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:ffffc900001e0ac0 EFLAGS: 00000206
RAX: 669f99cbb41e3a00 RBX: 1ffff9200003c160 RCX: 669f99cbb41e3a00
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc900001e0bb0 R08: ffffffff90aff24f R09: 1ffffffff215fe49
R10: dffffc0000000000 R11: fffffbfff215fe4a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1815
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1832
 handle_softirqs+0x2a1/0x930 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:__rcu_read_unlock+0x65/0xd0 kernel/rcu/tree_plugin.h:433
Code: 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 75 5f 41 83 3e 00 75 20 43 0f b6 04 3c 84 c0 75 3a 8b 03 3d 00 00 00 40 73 0a <5b> 41 5c 41 5d 41 5e 41 5f c3 0f 0b eb f2 e8 58 00 00 00 eb d9 89
RSP: 0018:ffffc900033b6480 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffff88802b72a23c RCX: 0000000000080000
RDX: ffffc90013644000 RSI: 00000000000209bd RDI: ffff88802b729e00
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff215fe48
R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 1ffff110056e5447
R13: dffffc0000000000 R14: ffff88802b72a240 R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 is_bpf_text_address+0x27a/0x2a0 kernel/bpf/core.c:737
 kernel_text_address+0x9c/0xd0 kernel/extable.c:125
 __kernel_text_address+0x9/0x30 kernel/extable.c:79
 unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
 arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 pskb_expand_head+0x1a6/0x12a0 net/core/skbuff.c:1849
 netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299
 netlink_broadcast+0x75/0x10d0 net/netlink/af_netlink.c:1500
 nlmsg_multicast include/net/netlink.h:1078 [inline]
 nlmsg_notify+0xe7/0x1a0 net/netlink/af_netlink.c:2554
 __dev_notify_flags+0xef/0x310 net/core/dev.c:8711
 dev_change_flags+0xe4/0x1a0 net/core/dev.c:8753
 do_setlink+0xba1/0x3e60 net/core/rtnetlink.c:2837
 rtnl_setlink+0x37e/0x510 net/core/rtnetlink.c:3128
 rtnetlink_rcv_msg+0x87c/0xfc0 net/core/rtnetlink.c:6158
 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5be/0x970 net/socket.c:2518
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572
 __sys_sendmsg net/socket.c:2601 [inline]
 __do_sys_sendmsg net/socket.c:2610 [inline]
 __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608
 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: 0033:0x7f3d7d99ce59
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:00007f3d7e913028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3d7dc15fa0 RCX: 00007f3d7d99ce59
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000013
RBP: 00007f3d7da32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3d7dc16038 R14: 00007f3d7dc15fa0 R15: 00007ffe97bf34f8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.