INFO: rcu detected stall in sys_getsockopt (3)

Status: upstream: reported on 2026/08/14 04:57
Reported-by: syzbot+87a8017a579afdd24a98@syzkaller.appspotmail.com
First crash: 1d13h, last: 1d13h
▶ ▼ Similar bugs (22)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_getsockopt (2) mm 1 1 2411d 2411d 0/29 closed as invalid on 2020/01/08 05:23
linux-4.19 INFO: rcu detected stall in sys_getsockopt 1 1 1424d 1424d 0/1 auto-obsoleted due to no activity on 2023/01/19 05:52
upstream INFO: rcu detected stall in sys_getsockopt (11) netfilter 1 4 958d 970d 0/29 auto-obsoleted due to no activity on 2024/03/30 17:47
linux-5.15 INFO: rcu detected stall in sys_getsockopt 1 1 977d 977d 0/3 auto-obsoleted due to no activity on 2024/03/21 16:23
linux-5.15 INFO: rcu detected stall in sys_getsockopt (2) 1 2 628d 663d 0/3 auto-obsoleted due to no activity on 2025/03/05 03:25
upstream INFO: rcu detected stall in sys_getsockopt (3) mm 1 1 2411d 2411d 0/29 closed as invalid on 2020/01/08 05:33
linux-6.6 INFO: rcu detected stall in sys_getsockopt (2) 1 1 266d 266d 0/2 auto-obsoleted due to no activity on 2026/03/02 01:54
upstream INFO: rcu detected stall in sys_getsockopt (4) mm 1 3 2411d 2411d 0/29 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_getsockopt (6) kvm 1 3 1829d 1897d 0/29 auto-closed as invalid on 2021/11/10 12:58
linux-6.6 INFO: rcu detected stall in sys_getsockopt 1 1 395d 395d 0/2 auto-obsoleted due to no activity on 2025/10/24 08:59
upstream INFO: rcu detected stall in sys_getsockopt (7) netfilter 1 2 1686d 1735d 0/29 closed as invalid on 2022/02/08 10:10
upstream INFO: rcu detected stall in sys_getsockopt (5) sctp 1 2 2228d 2271d 0/29 auto-closed as invalid on 2020/10/06 19:28
linux-6.1 INFO: rcu detected stall in sys_getsockopt 1 4 894d 1051d 0/3 auto-obsoleted due to no activity on 2024/06/12 17:46
upstream INFO: rcu detected stall in sys_getsockopt (10) mm 1 9 1089d 1170d 0/29 auto-obsoleted due to no activity on 2023/11/20 15:28
linux-5.15 BUG: soft lockup in sys_getsockopt 1 2 415d 437d 0/3 auto-obsoleted due to no activity on 2025/10/03 23:07
linux-6.1 INFO: rcu detected stall in sys_getsockopt (2) origin:lts-only 1 syz, C error 5 148d 512d 0/3 upstream: reported C repro on 2025/03/21 07:27
upstream INFO: rcu detected stall in sys_getsockopt (9) kernel 1 6 1292d 1448d 0/29 auto-obsoleted due to no activity on 2023/05/01 05:21
upstream INFO: rcu detected stall in sys_getsockopt (8) net 1 2 1576d 1592d 0/29 auto-closed as invalid on 2022/07/21 00:25
upstream INFO: rcu detected stall in sys_getsockopt mm 1 2 2446d 2446d 0/29 closed as invalid on 2019/12/04 14:04
android-5-10 BUG: soft lockup in sys_getsockopt 1 1 36d 36d 0/2 premoderation: reported on 2026/07/10 13:22
android-54 BUG: soft lockup in sys_getsockopt 1 1 850d 850d 0/2 auto-obsoleted due to no activity on 2024/07/15 21:19
android-5-15 BUG: soft lockup in sys_getsockopt 1 6 745d 844d 0/2 auto-obsoleted due to no activity on 2024/10/28 21:41

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-....: (1 GPs behind) idle=c1d/1/0x4000000000000002 softirq=7174/7175 fqs=2097 
	(detected by 0, t=10502 jiffies, g=7545, q=1308)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4193 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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: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+0x84/0x290 mm/kasan/generic.c:189
Code: 49 c1 e9 03 4b 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 <0f> 85 86 01 00 00 49 ff c3 48 ff c3 75 ee e9 18 01 00 00 44 89 dd
RSP: 0018:ffffc90000dd0090 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff815cf2d5
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901ee0c0
RBP: ffffc90000dd02f0 R08: ffffffff901ee0c7 R09: 1ffffffff203dc18
R10: dffffc0000000000 R11: fffffbfff203dc18 R12: dffffc0000000001
R13: ffff888078cb0000 R14: 1ffffffff203dc18 R15: 0000000000000001
FS:  0000555563f98500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1891c5078 CR3: 0000000062a9c000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 hlock_class kernel/locking/lockdep.c:197 [inline]
 __lock_acquire+0x1305/0x7b50 kernel/locking/lockdep.c:5009
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 BPF_PROG_RUN_ARRAY include/linux/bpf.h:1432 [inline]
 trace_call_bpf+0xf9/0x5b0 kernel/trace/bpf_trace.c:127
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10016
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 02 20 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000dd0780 EFLAGS: 00000206
RAX: a519f2d1106ad100 RBX: 1ffff920001ba0f4 RCX: a519f2d1106ad100
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: ffffc90000dd0860 R08: ffffffff901ee1c7 R09: 1ffffffff203dc38
R10: dffffc0000000000 R11: fffffbfff203dc39 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ndisc_send_skb+0xd39/0x1410 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3966
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rmqueue_pcplist mm/page_alloc.c:3711 [inline]
RIP: 0010:rmqueue mm/page_alloc.c:3742 [inline]
RIP: 0010:get_page_from_freelist+0x1f20/0x2670 mm/page_alloc.c:4189
Code: 8f 84 24 c0 01 00 00 f7 84 24 c0 01 00 00 00 02 00 00 c6 44 08 04 f8 0f 85 89 02 00 00 41 f7 c5 00 02 00 00 74 01 fb 4d 85 f6 <44> 8b 6c 24 2c 0f 84 d5 00 00 00 4c 89 f0 48 c1 e8 03 80 3c 08 00
RSP: 0018:ffffc90002f2ef80 EFLAGS: 00000282
RAX: 1ffff920005e5e24 RBX: ffffffff8be3d828 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: ffffc90002f2f1d0 R08: ffffffff901ee157 R09: 1ffffffff203dc2a
R10: dffffc0000000000 R11: fffffbfff203dc2b R12: ffff88813fffd310
R13: 0000000000000202 R14: ffffea000180d040 R15: 0000000000102dc2
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 vm_area_alloc_pages mm/vmalloc.c:2876 [inline]
 __vmalloc_area_node mm/vmalloc.c:2932 [inline]
 __vmalloc_node_range+0x4b1/0x8b0 mm/vmalloc.c:3037
 __vmalloc_node mm/vmalloc.c:3087 [inline]
 vzalloc+0x75/0x80 mm/vmalloc.c:3157
 alloc_counters+0xcc/0x740 net/ipv4/netfilter/ip_tables.c:800
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:822 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1021 [inline]
 do_ipt_get_ctl+0xa37/0x1110 net/ipv4/netfilter/ip_tables.c:1666
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x1219/0x1660 net/ipv4/ip_sockglue.c:1797
 tcp_getsockopt+0x209/0x2530 net/ipv4/tcp.c:4323
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
 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: 0033:0x7fc188f748aa
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffe9562e808 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffe9562e890 RCX: 00007fc188f748aa
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffe9562e82c R09: 0000000000000000
R10: 00007ffe9562e890 R11: 0000000000000212 R12: 00007fc1891c5d40
R13: 00007ffe9562e82c R14: 0000000000000000 R15: 00007fc1891c7180
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/14 04:57 linux-5.15.y aabd761612db b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_getsockopt
* Struck through repros no longer work on HEAD.