syzbot

 sign-in | mailing list | source | docs
🐞 Open [829]
🐞 Fixed [87]
🐞 Invalid [1201]
⬇ Missing Backports [133]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

INFO: rcu detected stall in sys_socket (2)

Status: upstream: reported C repro on 2024/03/02 17:55
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+7fbca9615641a39d3919@syzkaller.appspotmail.com
First crash: 697d, last: 7d09h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/03/02 upstream (ToT) 4640e2be3920 C [report] INFO: rcu detected stall in sys_clock_adjtime
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_socket (4) fs 1 1 1736d 1736d 0/29 auto-closed as invalid on 2021/07/27 17:27
linux-5.15 INFO: rcu detected stall in sys_socket 1 1 848d 848d 0/3 auto-obsoleted due to no activity on 2024/01/11 06:48
upstream INFO: rcu detected stall in sys_socket (5) net 1 2 1573d 1599d 0/29 auto-closed as invalid on 2022/01/06 01:08
upstream INFO: rcu detected stall in sys_socket mm 1 11 2247d 2248d 0/29 closed as invalid on 2019/12/04 14:04
linux-6.6 INFO: rcu detected stall in sys_socket 1 12 21d 200d 0/2 upstream: reported on 2025/07/12 12:18
linux-4.19 INFO: rcu detected stall in sys_socket 1 1 1377d 1377d 0/1 auto-closed as invalid on 2022/08/20 07:08
upstream INFO: rcu detected stall in sys_socket (10) mm 1 C done 188 10d 790d 0/29 upstream: reported C repro on 2023/11/30 15:24
linux-6.1 INFO: rcu detected stall in sys_socket 1 2 541d 541d 0/3 auto-obsoleted due to no activity on 2024/11/13 04:32
linux-6.1 INFO: rcu detected stall in sys_socket (3) origin:lts-only 1 C inconclusive 16 1d00h 141d 0/3 upstream: reported C repro on 2025/09/09 01:58
upstream INFO: rcu detected stall in sys_socket (6) cgroups mm 1 2 1232d 1276d 0/29 auto-obsoleted due to no activity on 2022/12/12 22:48
upstream INFO: rcu detected stall in sys_socket (7) kernel 1 2 1092d 1124d 0/29 auto-obsoleted due to no activity on 2023/05/02 14:50
linux-6.1 INFO: rcu detected stall in sys_socket (2) 1 3 331d 384d 0/3 auto-obsoleted due to no activity on 2025/06/11 16:02
upstream INFO: rcu detected stall in sys_socket (9) mm kasan 1 2 909d 919d 0/29 closed as invalid on 2023/09/07 14:25
upstream INFO: rcu detected stall in sys_socket (2) mm 1 3 2212d 2212d 0/29 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_socket (3) mm 1 4 2212d 2212d 0/29 closed as invalid on 2020/01/09 08:13
android-5-15 BUG: soft lockup in sys_socket 1 C error 26 509d 658d 0/2 auto-obsoleted due to no activity on 2024/11/29 22:24
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/11/23 12:25 16m retest repro linux-5.15.y report log
2025/09/01 15:19 11m retest repro linux-5.15.y report log
2024/11/09 01:56 10m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (11)
Created Duration User Patch Repo Result
2025/06/18 18:34 21m bisect fix linux-5.15.y error job log
2025/05/16 00:27 3h16m bisect fix linux-5.15.y OK (0) job log log
2025/04/14 09:08 2h05m bisect fix linux-5.15.y OK (0) job log log
2025/03/10 16:30 1h34m bisect fix linux-5.15.y OK (0) job log log
2025/02/08 02:08 1h49m bisect fix linux-5.15.y OK (0) job log log
2025/01/06 07:39 2h17m bisect fix linux-5.15.y OK (0) job log log
2024/11/17 22:16 2h24m bisect fix linux-5.15.y OK (0) job log log
2024/08/30 12:18 2h13m bisect fix linux-5.15.y OK (0) job log log
2024/07/23 07:26 1h41m bisect fix linux-5.15.y OK (0) job log log
2024/05/16 05:36 1h57m bisect fix linux-5.15.y OK (0) job log log
2024/04/01 19:14 1h22m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 ticks this GP) idle=9a5/1/0x4000000000000000 softirq=4277/4277 fqs=5250 
	(detected by 1, t=10502 jiffies, g=3565, q=270)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3528 Comm: syz-executor291 Not tainted 5.15.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x60 kernel/kcov.c:197
Code: 89 fb e8 17 00 00 00 48 8b 3d d8 58 63 0c 48 89 de 5b e9 57 e5 48 00 cc cc cc cc cc cc cc 48 8b 04 24 65 48 8b 0d 24 3a 82 7e <65> 8b 15 25 3a 82 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74
RSP: 0018:ffffc90000007d38 EFLAGS: 00000046
RAX: ffffffff816f6ccc RBX: ffff888078ef9b40 RCX: ffff888018babb80
RDX: 0000000080010001 RSI: 0000000000000001 RDI: ffff888078ef9b40
RBP: ffffc90000007eb0 R08: ffffffff816f3c5c R09: ffff888078ef9b48
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b9a2a200
R13: ffff8880b9a2a300 R14: ffff888078ef9b40 R15: dffffc0000000000
FS:  0000555555dc2380(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 0000000070d7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 debug_deactivate+0xc/0x1e0 kernel/time/hrtimer.c:480
 __run_hrtimer kernel/time/hrtimer.c:1654 [inline]
 __hrtimer_run_queues+0x31d/0xcf0 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:40 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:75 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:107 [inline]
RIP: 0010:lock_is_held_type+0x69/0x180 kernel/locking/lockdep.c:5662
Code: 8b 2d 2b d4 e6 75 41 83 bd ec 0a 00 00 00 0f 85 db 00 00 00 41 89 f6 49 89 ff 48 c7 04 24 00 00 00 00 9c 8f 04 24 4c 8b 24 24 <fa> 48 c7 c7 00 23 8b 8a e8 1a 12 00 00 65 ff 05 33 dd e6 75 41 83
RSP: 0018:ffffc900021e7c48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8c947bc0 RCX: 0000000080000000
RDX: ffff888018babb80 RSI: 00000000ffffffff RDI: ffffffff8c91f720
RBP: 00000000ffffffff R08: ffffffff8178bafb R09: fffffbfff1f79e19
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000246
R13: ffff888018babb80 R14: 00000000ffffffff R15: ffffffff8c91f720
 task_css_set include/linux/cgroup.h:483 [inline]
 cgroup_sk_alloc+0x1e5/0x3c0 kernel/cgroup/cgroup.c:6734
 sk_alloc+0x204/0x310 net/core/sock.c:1925
 __netlink_create+0x6b/0x2c0 net/netlink/af_netlink.c:647
 netlink_create+0x3a9/0x500 net/netlink/af_netlink.c:710
 __sock_create+0x460/0x8d0 net/socket.c:1486
 sock_create net/socket.c:1537 [inline]
 __sys_socket+0x132/0x370 net/socket.c:1579
 __do_sys_socket net/socket.c:1588 [inline]
 __se_sys_socket net/socket.c:1586 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1586
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fcb92be1ee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff75d2b908 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcb92be1ee9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00000000000f4240 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000100000000 R11: 0000000000000246 R12: 00007fff75d2b960
R13: 000000000002f98a R14: 00007fff75d2b92c R15: 0000000000000003
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.417 msecs

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/02 17:54 linux-5.15.y 80efc6265290 25905f5d .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_socket
2026/01/21 11:58 linux-5.15.y 9eec9a14ee10 6f1aa2f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2026/01/18 23:47 linux-5.15.y 68efe5a6c16a 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2026/01/18 23:45 linux-5.15.y 68efe5a6c16a 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2026/01/17 10:24 linux-5.15.y 68efe5a6c16a 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2026/01/13 15:08 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2026/01/10 18:53 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/18 04:43 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/18 00:00 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/09 22:42 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/09 02:41 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/05 23:07 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/05 18:58 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/05 17:52 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/12/03 21:23 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/11/08 11:01 linux-5.15.y cc5ec8769306 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/11/07 22:30 linux-5.15.y cc5ec8769306 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/11/07 18:18 linux-5.15.y cc5ec8769306 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/10/29 01:10 linux-5.15.y ac56c046adf4 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/10/28 13:37 linux-5.15.y ac56c046adf4 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/10/27 09:01 linux-5.15.y ac56c046adf4 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/10/19 18:52 linux-5.15.y ac56c046adf4 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/10/10 19:07 linux-5.15.y 29e53a5b1c4f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/09/29 07:24 linux-5.15.y 43bb85222e53 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/09/29 06:58 linux-5.15.y 43bb85222e53 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/09/12 17:36 linux-5.15.y 43bb85222e53 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/09/07 15:18 linux-5.15.y 7a6c2d093c45 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/08/09 12:33 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2025/08/05 16:34 linux-5.15.y c79648372d02 37880f40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_socket
2025/07/28 03:02 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2024/10/12 17:36 linux-5.15.y 3a5928702e71 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2024/10/11 02:00 linux-5.15.y 3a5928702e71 8fbfc0c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in sys_socket
2024/06/07 18:49 linux-5.15.y c61bd26ae81a 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_socket
2024/05/28 01:44 linux-5.15.y c61bd26ae81a f550015e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_socket
2024/04/10 13:57 linux-5.15.y 9465fef4ae35 4320ec32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_socket
* Struck through repros no longer work on HEAD.