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WARNING in rcu_check_gp_start_stall

Status: upstream: reported C repro on 2019/02/22 17:10
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+111bc509cd9740d7e4aa@syzkaller.appspotmail.com
First crash: 2414d, last: 6h55m
Cause bisection: introduced by (bisect log) :
commit f1e3e92135202ff3d95195393ee62808c109208c
Author: Malcolm Priestley <tvboxspy@gmail.com>
Date: Wed Jul 22 18:16:42 2015 +0000

  staging: vt6655: fix tagSRxDesc -> next_desc type

Crash: INFO: rcu detected stall in corrupted (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[syzbot] Monthly net report (Sep 2025) 0 (1) 2025/09/15 06:54
[syzbot] Monthly net report (Aug 2025) 0 (1) 2025/08/14 12:42
[syzbot] Monthly net report (Jul 2025) 0 (1) 2025/07/14 07:23
[syzbot] Monthly net report (Jun 2025) 0 (1) 2025/06/13 12:25
[syzbot] Monthly net report (Nov 2024) 0 (1) 2024/11/04 08:49
[syzbot] Monthly net report (Oct 2024) 0 (1) 2024/10/03 09:02
[syzbot] Monthly net report (Sep 2024) 0 (1) 2024/09/02 08:21
[syzbot] Monthly net report (Aug 2024) 0 (1) 2024/08/02 07:26
[syzbot] Monthly net report (Jul 2024) 0 (1) 2024/07/01 10:28
[syzbot] Monthly mm report (May 2023) 0 (1) 2023/05/03 07:26
WARNING in rcu_check_gp_start_stall 7 (9) 2019/03/18 12:18
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in rcu_check_gp_start_stall (3) -1 4 22d 92d 0/3 upstream: reported on 2025/07/02 22:12
linux-6.6 WARNING in rcu_check_gp_start_stall origin:lts-only -1 syz 62 1d07h 107d 0/2 upstream: reported syz repro on 2025/06/17 13:49
linux-5.15 WARNING in rcu_check_gp_start_stall (2) -1 7 381d 526d 0/3 auto-obsoleted due to no activity on 2024/12/25 11:45
linux-5.15 WARNING in rcu_check_gp_start_stall -1 1 664d 664d 0/3 auto-obsoleted due to no activity on 2024/03/17 09:39
linux-6.1 WARNING in rcu_check_gp_start_stall origin:upstream missing-backport -1 C done 19 1d18h 746d 0/3 upstream: reported C repro on 2023/09/17 20:24
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/08/20 15:53 24m retest repro net OK log
2025/08/20 15:53 25m retest repro net OK log
2025/08/20 15:53 21m retest repro net report log
2025/08/20 15:53 22m retest repro net report log
2025/08/20 15:53 19m retest repro net report log
2025/08/20 12:53 23m retest repro upstream OK log
2025/08/20 12:53 39m retest repro upstream OK log
2025/08/20 12:53 26m retest repro upstream OK log
2025/08/20 11:24 24m retest repro upstream report log
2025/08/20 09:53 41m retest repro net-next report log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2020/05/17 02:11 0m bisect fix upstream error job log
2020/04/16 22:09 21m bisect fix upstream OK (0) job log log
2020/03/17 16:07 23m bisect fix upstream OK (0) job log log
2020/02/16 08:59 23m bisect fix upstream OK (0) job log log
2019/12/16 21:03 22m bisect fix upstream OK (0) job log log

Sample crash report:
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 24 at kernel/rcu/tree_stall.h:1010 rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:1010
Modules linked in:
CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc2-syzkaller-00320-gba01565ced22 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:1010
Code: c7 c0 1a 41 9a be 04 00 00 00 e8 8c 13 83 00 b8 01 00 00 00 87 05 d1 93 c5 18 85 c0 0f 85 1a ff ff ff 48 c7 c0 00 cc 93 8e 90 <0f> 0b 90 49 39 c7 74 47 48 c7 c0 bc 25 1d 90 48 c1 e8 03 42 0f b6
RSP: 0018:ffffc900001e7a18 EFLAGS: 00010046
RAX: ffffffff8e93cc00 RBX: 00000000ffffee26 RCX: ffffffff817b86e4
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9a411ac0
RBP: ffffc900001e7c70 R08: 0000000000000003 R09: fffffbfff3482358
R10: dffffc0000000000 R11: fffffbfff3482358 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8e93cc00
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e6a9f7f18 CR3: 0000000027932000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_core+0x650/0x17a0 kernel/rcu/tree.c:2818
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (2687):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/14 06:28 upstream ba01565ced22 084d8178 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in rcu_check_gp_start_stall
2024/11/26 16:34 net 5d066766c5f1 11dbc254 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2024/10/15 02:49 net 0b84db5d8f25 b01b6661 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2024/02/04 06:52 net b09b58e31b0f a67b2c42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2025/01/13 00:32 net-next 7d0da8f86234 6dbc6a9b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in rcu_check_gp_start_stall
2024/12/05 20:56 net-next da4fa00abe56 6e50d07b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in rcu_check_gp_start_stall
2023/08/30 09:13 net-next bd6c11bc43c4 b42ca3a7 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in rcu_check_gp_start_stall
2023/09/16 19:19 net-next c123e0d30bdb 0b6a67ac .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/22 00:07 upstream 2d5bd41a4505 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/07 13:03 upstream b236920731dd d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in rcu_check_gp_start_stall
2025/08/23 14:20 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in rcu_check_gp_start_stall
2025/08/06 08:38 upstream 6bcdbd62bd56 904e669c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in rcu_check_gp_start_stall
2025/08/03 18:53 upstream 186f3edfdd41 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in rcu_check_gp_start_stall
2025/08/02 22:00 upstream 038d61fd6422 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in rcu_check_gp_start_stall
2025/03/03 03:25 upstream 7eb172143d55 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_check_gp_start_stall
2024/12/09 18:07 upstream fac04efc5c79 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_check_gp_start_stall
2024/05/28 02:49 upstream 2bfcfd584ff5 f550015e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in rcu_check_gp_start_stall
2024/03/31 09:12 upstream fe46a7dd189e 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in rcu_check_gp_start_stall
2023/06/02 12:09 upstream 1874a42a7d74 a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in rcu_check_gp_start_stall
2024/12/25 16:16 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in rcu_check_gp_start_stall
2025/07/23 04:34 upstream 89be9a83ccf1 e1dd4f22 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in rcu_check_gp_start_stall
2025/09/11 16:10 upstream 7aac71907bde e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in rcu_check_gp_start_stall
2025/10/02 20:32 bpf f09f57c74677 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/29 23:34 bpf e5f0a698b34e 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/28 20:29 bpf bf40f4b87761 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/25 07:19 bpf f36caa7c14f4 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/23 06:10 bpf f36caa7c14f4 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/23 01:50 bpf f36caa7c14f4 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/22 23:15 bpf f36caa7c14f4 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/18 15:46 bpf f36caa7c14f4 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/15 22:16 bpf 22f20375f5b7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/15 19:33 bpf 22f20375f5b7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/14 18:31 bpf 22f20375f5b7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/13 10:07 bpf 22f20375f5b7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/28 15:27 bpf 7abc678e3084 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/24 22:48 bpf 7abc678e3084 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in rcu_check_gp_start_stall
2025/01/18 12:14 net 70d81f25cc92 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2024/04/30 22:13 net ba1cb99b559e 9e0e6af1 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2024/04/12 02:19 net f99c5f563c17 478efa7f .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in rcu_check_gp_start_stall
2025/10/02 04:11 bpf-next 4ef77dd584cf a1859138 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/10/02 00:31 bpf-next 4ef77dd584cf a1859138 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/10/01 08:20 bpf-next 4ef77dd584cf 65a0eece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/30 12:46 bpf-next 4ef77dd584cf 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/30 10:32 bpf-next 4ef77dd584cf 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/30 07:27 bpf-next 4ef77dd584cf 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/29 10:47 bpf-next 4ef77dd584cf 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/27 08:24 bpf-next 991e555efffd 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/24 18:59 bpf-next 34f033a6c9c9 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/24 17:22 bpf-next 34f033a6c9c9 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/24 04:43 bpf-next 348f6117c16a 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/24 00:15 bpf-next 348f6117c16a 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/23 15:56 bpf-next 58a5820582e4 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/21 14:31 bpf-next 5a427fddec5e 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/19 15:25 bpf-next 8cd189e414bb 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/17 03:44 bpf-next b13448dd64e2 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/15 15:19 bpf-next fd2e08128944 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/15 01:26 bpf-next a578b54a8ad2 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/14 21:37 bpf-next a578b54a8ad2 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/14 04:35 bpf-next a578b54a8ad2 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/12 08:54 bpf-next 5d87e96a4971 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/12 05:25 bpf-next 5d87e96a4971 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/08/22 18:47 bpf-next 0780f54ab129 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/29 12:37 bpf-next cd7c97f4584a c4a95487 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/28 21:16 bpf-next 5b4c54ac49af c4a95487 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/28 05:15 bpf-next 5345e64760d3 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/27 23:26 bpf-next 5345e64760d3 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/26 17:31 bpf-next 9ea0691e47b8 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/26 08:58 bpf-next 9ea0691e47b8 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/07/25 21:36 bpf-next 95993dc3039e fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in rcu_check_gp_start_stall
2025/01/22 12:59 net-next b1754a69e7be da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in rcu_check_gp_start_stall
2025/09/28 17:14 linux-next 262858079afd 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_check_gp_start_stall
2025/09/17 02:29 linux-next 05af76471921 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_check_gp_start_stall
2025/08/26 11:24 linux-next 7fa4d8dc380f bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_check_gp_start_stall
2025/08/21 01:27 linux-next 5303936d609e 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_check_gp_start_stall
2024/04/26 06:01 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing a160e1202ca3 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb WARNING in rcu_check_gp_start_stall
2019/02/22 16:31 upstream 8a61716ff2ab 6a5fcca4 .config console log report syz C ci-upstream-kasan-gce-smack-root
2019/02/22 08:04 upstream 8a61716ff2ab 7ff74a98 .config console log report syz C ci-upstream-kasan-gce-root
2020/12/29 06:01 upstream dea8dcf2a9fa 8259d56c .config console log report info ci-qemu-upstream-386
* Struck through repros no longer work on HEAD.