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INFO: rcu detected stall in addrconf_rs_timer

Status: upstream: reported C repro on 2025/11/29 19:55
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+1c0f13d7bc65d06d5fc9@syzkaller.appspotmail.com
First crash: 213d, last: 3d02h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/04/20 linux-6.6.y (ToT) 9760bf04666d C [report] INFO: rcu detected stall in smp_call_function
2026/04/20 upstream (ToT) c1f49dea2b8f C Didn't crash
▶ ▼ Similar bugs (32)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in addrconf_rs_timer (2) net 1 362 2463d 2485d 13/29 fixed on 2019/10/21 12:31
linux-4.14 INFO: rcu detected stall in addrconf_rs_timer 1 C error 220 2127d 2489d 0/1 upstream: reported C repro on 2019/09/06 14:33
upstream INFO: rcu detected stall in addrconf_rs_timer net 1 38 2750d 2845d 0/29 closed as dup on 2019/01/02 16:33
linux-4.19 INFO: rcu detected stall in addrconf_rs_timer 1 45 2477d 2489d 0/1 auto-closed as invalid on 2019/12/17 18:46
linux-4.19 BUG: soft lockup in addrconf_rs_timer 1 syz error 24 1247d 1930d 0/1 upstream: reported syz repro on 2021/03/19 06:05
linux-5.15 BUG: soft lockup in addrconf_rs_timer 1 C error 36 1113d 1125d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:06
upstream INFO: rcu detected stall in addrconf_rs_timer (3) net 1 C inconclusive done 81 2385d 2381d 15/29 fixed on 2020/02/18 14:31
linux-4.19 INFO: rcu detected stall in addrconf_rs_timer (2) 1 5 2127d 2201d 0/1 auto-closed as invalid on 2020/12/31 12:17
upstream INFO: rcu detected stall in addrconf_rs_timer (5) kvm 1 4 1527d 1527d 0/29 auto-closed as invalid on 2022/06/24 22:41
upstream INFO: rcu detected stall in addrconf_rs_timer (4) net 1 C error error 121 1703d 2157d 0/29 closed as invalid on 2022/02/08 10:39
linux-6.1 INFO: rcu detected stall in addrconf_rs_timer origin:lts-only 1 C done 111 7h13m 767d 0/3 upstream: reported C repro on 2024/05/24 18:08
linux-5.15 INFO: rcu detected stall in addrconf_rs_timer origin:lts-only 1 C error 111 10h33m 934d 0/3 upstream: reported C repro on 2023/12/10 10:27
upstream INFO: rcu detected stall in addrconf_rs_timer (6) prio:normal virt mm netfilter 1 syz error error 703 2d12h 759d 0/29 upstream: reported syz repro on 2024/06/01 13:51
upstream BUG: soft lockup in addrconf_rs_timer (3) net 1 syz 8 1007d 1071d 0/29 auto-obsoleted due to no activity on 2024/01/05 16:48
upstream BUG: soft lockup in addrconf_rs_timer (4) net 1 1 902d 902d 0/29 closed as invalid on 2024/03/12 13:17
android-6-1 BUG: soft lockup in addrconf_rs_timer 1 1 975d 975d 0/2 auto-obsoleted due to no activity on 2024/01/27 13:54
android-5-10 BUG: soft lockup in addrconf_rs_timer (2) 1 C 265 407d 738d 0/2 auto-obsoleted due to no activity on 2025/07/28 18:01
android-6-1 BUG: soft lockup in addrconf_rs_timer (5) origin:lts 1 C 6 47d 51d 0/2 upstream: reported C repro on 2026/05/10 21:46
android-5-10 BUG: soft lockup in addrconf_rs_timer 1 2 1066d 1084d 0/2 auto-obsoleted due to no activity on 2023/10/29 01:38
linux-6.1 BUG: soft lockup in addrconf_rs_timer 1 C done 26 1113d 1125d 3/3 fixed on 2023/07/30 15:47
linux-4.14 BUG: soft lockup in addrconf_rs_timer 1 C error 133 1285d 2487d 0/1 upstream: reported C repro on 2019/09/08 14:09
android-5-10 BUG: soft lockup in addrconf_rs_timer (3) 1 1 147d 147d 0/2 auto-obsoleted due to no activity on 2026/05/05 01:45
android-5-15 BUG: soft lockup in addrconf_rs_timer (3) 1 1 71d 71d 0/2 premoderation: reported on 2026/04/20 17:07
android-5-15 BUG: soft lockup in addrconf_rs_timer (2) 1 syz 99 552d 795d 0/2 auto-obsoleted due to no activity on 2025/02/14 09:13
android-6-1 BUG: soft lockup in addrconf_rs_timer (3) 1 1 452d 452d 0/2 auto-obsoleted due to no activity on 2025/07/03 20:11
android-54 BUG: soft lockup in addrconf_rs_timer 1 190 727d 782d 0/2 auto-obsoleted due to no activity on 2024/08/22 17:20
android-5-10 BUG: soft lockup in addrconf_rs_timer (4) 1 1 15h54m 15h54m 0/2 premoderation: reported on 2026/06/30 19:53
android-6-1 BUG: soft lockup in addrconf_rs_timer (2) 1 syz 176 573d 778d 0/2 auto-obsoleted due to no activity on 2025/01/24 01:43
upstream BUG: soft lockup in addrconf_rs_timer (2) net 1 C 51 1105d 1126d 23/29 fixed on 2023/07/04 09:17
android-6-1 BUG: soft lockup in addrconf_rs_timer (4) 1 7 175d 323d 0/2 auto-obsoleted due to no activity on 2026/04/06 21:21
android-5-15 BUG: soft lockup in addrconf_rs_timer 1 1 1073d 1073d 0/2 auto-obsoleted due to no activity on 2023/10/21 14:14
upstream BUG: soft lockup in addrconf_rs_timer net 1 18 2291d 2488d 0/29 auto-closed as invalid on 2020/07/20 22:25
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2026/04/23 04:40 12m fix candidate upstream error job log
2026/03/23 04:41 1m fix candidate upstream error job log
2026/02/21 04:32 1m fix candidate upstream error job log
2026/01/21 13:20 1m fix candidate upstream error job log

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=c50c/1/0x4000000000000000 softirq=12068/12079 fqs=1
rcu: 	(t=10500 jiffies g=10253 q=436 ncpus=2)
rcu: rcu_preempt kthread starved for 10497 jiffies! g10253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27848 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5948 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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 81 de a2 8c 4c 89 e6 eb 0a 48 c7 c7 ba ae 84 8c 48 89 de e8 05 f8 98 08 31 ed eb d4 cc <f3> 0f 1e fa 89 f6 48 8b 0c 24 31 d2 e9 ff ea ff ff 66 2e 0f 1f 84
RSP: 0018:ffffc900001ef618 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff911bc500
RBP: ffffc900001ef868 R08: dffffc0000000000 R09: 1ffffffff22378a0
R10: dffffc0000000000 R11: fffffbfff22378a1 R12: 0000000000000002
R13: ffff88807b0b47c8 R14: 0000000000000021 R15: ffff88807b0b47c8
FS:  0000555573bee500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000001c43e CR3: 0000000021877000 CR4: 00000000003506e0
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]
 check_wait_context kernel/locking/lockdep.c:4798 [inline]
 __lock_acquire+0x952/0x7d80 kernel/locking/lockdep.c:5087
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:163 [inline]
 perf_output_begin_forward+0xde/0xa60 kernel/events/ring_buffer.c:273
 __perf_event_output kernel/events/core.c:7969 [inline]
 perf_event_output_forward+0x25a/0x3e0 kernel/events/core.c:7987
 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9712
 perf_swevent_overflow kernel/events/core.c:9795 [inline]
 perf_swevent_event+0x319/0x570 kernel/events/core.c:9846
 perf_tp_event+0x620/0x1550 kernel/events/core.c:10373
 perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10292
 perf_trace_preemptirq_template+0x269/0x330 include/trace/events/preemptirq.h:14
 trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:seqcount_lockdep_reader_access+0x19a/0x1d0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 a5 bf 0f 00 eb 15 e8 9e bf 0f 00 e8 89 b2 0c 09 4d 85 e4 74 ea e8 8f bf 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900001f0200 EFLAGS: 00000246
RAX: ffffffff817725c1 RBX: 0000000000000000 RCX: ffff88807b0b3c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001f02b8 R08: ffffffff911bc607 R09: 1ffffffff22378c0
R10: dffffc0000000000 R11: fffffbfff22378c1 R12: 0000000000000200
R13: 000001fb6ebe4598 R14: 1ffff9200003e040 R15: dffffc0000000000
 ktime_get_with_offset+0x94/0x330 kernel/time/timekeeping.c:889
 ktime_get_real include/linux/timekeeping.h:79 [inline]
 netif_rx_internal+0x33d/0x4e0 net/core/dev.c:5153
 __netif_rx+0x78/0xc0 net/core/dev.c:5196
 veth_forward_skb drivers/net/veth.c:325 [inline]
 veth_xmit+0x57a/0xa30 drivers/net/veth.c:378
 __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+0x269/0x790 net/core/dev.c:3660
 __dev_queue_xmit+0x198c/0x3630 net/core/dev.c:4454
 dev_queue_xmit include/linux/netdevice.h:3113 [inline]
 neigh_hh_output include/net/neighbour.h:527 [inline]
 neigh_output include/net/neighbour.h:541 [inline]
 ip6_finish_output2+0xdf7/0x1620 net/ipv6/ip6_output.c:141
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4029
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/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:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 01 48 d0 f6 e8 3c 34 01 f7 fb bf 01 00 00 00 <e8> 31 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90003417b40 EFLAGS: 00000286
RAX: 805f270aad01a600 RBX: 0000000000000000 RCX: 805f270aad01a600
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc90003417be0 R08: ffffffff8e8ae5ef R09: 1ffffffff1d15cbd
R10: dffffc0000000000 R11: fffffbfff1d15cbe R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000682f68
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__nr_to_section include/linux/mmzone.h:1849 [inline]
RIP: 0010:__pfn_to_section include/linux/mmzone.h:1957 [inline]
RIP: 0010:pfn_valid include/linux/mmzone.h:2010 [inline]
RIP: 0010:__virt_addr_valid+0xe1/0x380 arch/x86/mm/physaddr.c:65
Code: c0 74 3e 48 89 f9 48 c1 e9 22 48 8d 1c c8 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 0b 48 89 df e8 15 c9 a2 00 4c 89 ff 4c 8b 33 <4d> 85 f6 74 12 48 89 f8 48 c1 e8 1b 83 e0 7f c1 e0 05 49 01 c6 eb
RSP: 0018:ffffc90003417ca0 EFLAGS: 00000246
RAX: 1ffff11047ffde00 RBX: ffff88823ffef000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000002f943900
RBP: ffffc90003417da8 R08: ffff88802f94395f R09: 1ffff11005f2872b
R10: dffffc0000000000 R11: ffffed1005f2872c R12: dffffc0000000000
R13: ffff88807b0b3c00 R14: ffff88813fff9000 R15: 000000002f943900
 kasan_addr_to_slab+0xd/0xd0 mm/kasan/common.c:36
 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477
 task_work_add+0xdd/0x470 kernel/task_work.c:82
 fput+0xdd/0x1a0 fs/file_table.c:440
 filp_close+0x10f/0x150 fs/open.c:1547
 __range_close fs/file.c:698 [inline]
 __close_range+0x379/0x690 fs/file.c:755
 __do_sys_close_range fs/open.c:1599 [inline]
 __se_sys_close_range fs/open.c:1596 [inline]
 __x64_sys_close_range+0x7a/0x90 fs/open.c:1596
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd40539ce59
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:00007ffc39bd2058 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007ffc39bd2140 RCX: 00007fd40539ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001c43e R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2ca20000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd405615fac R14: 00007fd405615fa8 R15: 00007fd405615fa0
 </TASK>
CPU: 0 PID: 5947 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x2e/0x90 kernel/kcov.c:313
Code: 48 8b 04 24 65 48 8b 15 30 cf 7c 7e 65 8b 0d 31 cf 7c 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 <74> 52 8b 8a f8 15 00 00 83 f9 03 75 47 48 8b 8a 00 16 00 00 44 8b
RSP: 0018:ffffc90000006c58 EFLAGS: 00000246
RAX: ffffffff813b2298 RBX: ffffc90000006cd0 RCX: 0000000000000100
RDX: ffff888026b33c00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888026b33c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff893b14eb
R13: 00000000000002c0 R14: dffffc0000000000 R15: 1ffff92000000d9a
FS:  000055557f13d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d363fff CR3: 000000007be59000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 unwind_get_return_address+0x68/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 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_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 kmem_cache_alloc_node+0x1af/0x310 mm/slub.c:3540
 kmalloc_reserve+0x95/0x240 net/core/skbuff.c:562
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 __pskb_copy_fclone+0xac/0x1000 net/core/skbuff.c:2023
 __pskb_copy include/linux/skbuff.h:1380 [inline]
 hsr_create_tagged_frame+0x223/0xc80 net/hsr/hsr_forward.c:301
 hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]
 hsr_forward_skb+0xefd/0x20b0 net/hsr/hsr_forward.c:626
 hsr_dev_xmit+0x1e7/0x350 net/hsr/hsr_device.c:238
 __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+0x269/0x790 net/core/dev.c:3660
 __dev_queue_xmit+0x198c/0x3630 net/core/dev.c:4454
 neigh_output include/net/neighbour.h:543 [inline]
 ip6_finish_output2+0xe2e/0x1620 net/ipv6/ip6_output.c:141
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4029
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/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:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 01 48 d0 f6 e8 3c 34 01 f7 fb bf 01 00 00 00 <e8> 31 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90003457d60 EFLAGS: 00000286
RAX: e652746e5291d700 RBX: 0000000000000000 RCX: e652746e5291d700
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc90003457e10 R08: ffffffff8e8ae5ef R09: 1ffffffff1d15cbd
R10: dffffc0000000000 R11: fffffbfff1d15cbe R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200068afac
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:exit_to_user_mode_loop+0x40/0x110 kernel/entry/common.c:164
Code: fb eb 1d e8 02 49 10 09 65 48 8b 05 0a 14 90 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 c4 00 00 00 e8 c5 af 19 00 fb 41 f6 c6 08 <74> 05 e8 19 76 18 09 41 f7 c6 00 10 00 00 74 08 48 89 df e8 b8 a0
RSP: 0018:ffffc90003457ed0 EFLAGS: 00000246
RAX: e652746e5291d700 RBX: ffffc90003457f58 RCX: e652746e5291d700
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: ffffffff8b1c7be0
RBP: ffffc90003457f48 R08: ffffffff8e8ae5ef R09: 1ffffffff1d15cbd
R10: dffffc0000000000 R11: fffffbfff1d15cbe R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000004002 R15: ffff888026b33c00
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe4ccd9ce59
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:00007ffd7cc8b2f8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000004 RBX: 00007fe4cd015fa0 RCX: 00007fe4ccd9ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007fe4cce32e6f R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe4cd015fac R14: 00007fe4cd015fa0 R15: 00007fe4cd015fa0
 </TASK>

Crashes (24):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/22 08:26 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/15 00:38 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/05 03:13 linux-6.6.y 924b4a879cbb 197909be .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/05/19 04:05 linux-6.6.y eac8889a3a1c 9f74d399 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/04/20 07:30 linux-6.6.y 9760bf04666d 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/04/19 05:04 linux-6.6.y 9760bf04666d 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/12 01:02 linux-6.6.y 924b4a879cbb d93a6ab6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf BUG: soft lockup in addrconf_rs_timer
2026/05/13 19:47 linux-6.6.y 3b9f64db0496 fec2a7ee .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2025/11/29 19:54 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/28 09:16 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/28 02:06 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/23 22:05 linux-6.6.y d1cfde2d5d15 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/15 01:22 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/05/11 00:42 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/04/17 12:23 linux-6.6.y 8cee53b8eaeb de0a551d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/03/31 20:43 linux-6.6.y c09fbcd31ae6 aeea1c72 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/03/29 22:29 linux-6.6.y c09fbcd31ae6 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/03/19 22:26 linux-6.6.y 4fc00fe35d46 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/01/31 16:21 linux-6.6.y 2cf6f68313dc afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2025/12/30 07:50 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2025/11/29 20:47 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in addrconf_rs_timer
2026/06/25 12:06 linux-6.6.y d1cfde2d5d15 cfa969bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf BUG: soft lockup in addrconf_rs_timer
2026/05/30 18:42 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf BUG: soft lockup in addrconf_rs_timer
2026/01/06 11:19 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf BUG: soft lockup in addrconf_rs_timer
* Struck through repros no longer work on HEAD.