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WARNING in kcm_write_msgs

Status: upstream: reported C repro on 2020/03/19 07:10
Labels: net (incorrect?)
Reported-by: syzbot+52624bdfbf2746d37d70@syzkaller.appspotmail.com
First crash: 1182d, last: 1d13h

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in sysfs_warn_dup (log)
Repro: C syz .config
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[syzbot] Monthly net report (May 2023) 0 (1) 2023/05/30 10:56
[syzbot] Monthly net report (Apr 2023) 0 (1) 2023/04/27 10:45
[syzbot] Monthly net report 0 (1) 2023/03/27 11:04
WARNING in kcm_write_msgs 0 (2) 2020/03/25 23:53
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 WARNING in kcm_write_msgs C inconclusive 2 148d 1154d 0/1 upstream: reported C repro on 2020/04/12 04:13
linux-4.19 WARNING in kcm_write_msgs C error 8 143d 1167d 0/1 upstream: reported C repro on 2020/03/30 19:34
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2021/06/10 21:46 29m bisect fix upstream job log (0) log
2021/03/02 19:18 23m bisect fix upstream job log (0) log
2021/01/10 10:33 23m bisect fix upstream job log (0) log
2020/11/12 12:50 17m bisect fix upstream job log (0) log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5150 at net/kcm/kcmsock.c:637 kcm_write_msgs+0x10ba/0x1990 net/kcm/kcmsock.c:637
Modules linked in:
CPU: 0 PID: 5150 Comm: syz-executor360 Not tainted 6.3.0-rc1-syzkaller-00274-g134231664868 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:kcm_write_msgs+0x10ba/0x1990 net/kcm/kcmsock.c:637
Code: 07 00 00 48 8b 44 24 68 45 31 e4 48 8b 74 24 08 48 89 70 10 e9 d5 f3 ff ff e8 72 ae 3e f8 0f 0b e9 09 f5 ff ff e8 66 ae 3e f8 <0f> 0b 41 bc ea ff ff ff e9 b7 f3 ff ff e8 54 ae 3e f8 48 8b 7c 24
RSP: 0018:ffffc9000405f9d8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000140 RCX: 0000000000000000
RDX: ffff888024490000 RSI: ffffffff8945272a RDI: 0000000000000001
RBP: ffff8880705d9c40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000
R13: ffff888070d68580 R14: ffff8880705d9b00 R15: 0000000000000000
FS:  00007f5956023700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020115000 CR3: 0000000070bf5000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 kcm_sendmsg+0x1dab/0x23c0 net/kcm/kcmsock.c:1043
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 sock_write_iter+0x295/0x3d0 net/socket.c:1138
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9ed/0xe10 fs/read_write.c:584
 ksys_write+0x1ec/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5956075b69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 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:00007f59560232f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59560ff4e0 RCX: 00007f5956075b69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f59560cbc8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f59560cb600
R13: 0000000020000240 R14: 656c6c616b7a7973 R15: 00007f59560ff4e8
 </TASK>

Crashes (325):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/03/13 05:05 upstream 134231664868 5205ef30 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in kcm_write_msgs
2023/01/05 12:13 upstream 512dee0c00ad 1dac8c7a .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2022/09/17 22:59 upstream a335366bad13 dd9a85ff .config strace log report syz C ci-upstream-kasan-gce-selinux-root WARNING in kcm_write_msgs
2022/08/20 00:39 upstream 4c2d0b039c5c 26a13b38 .config console log report syz C ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2022/07/03 05:08 upstream 34074da5424c 1434eec0 .config strace log report syz C ci-upstream-kasan-gce-root WARNING in kcm_write_msgs
2022/05/13 19:01 upstream f3f19f939c11 107f6434 .config strace log report syz C ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/01/05 03:32 net-old 558016722e9d 1dac8c7a .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2022/05/13 19:08 net-old f3f19f939c11 107f6434 .config strace log report syz C ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/01/05 10:16 net-next-old d75858ef108c 1dac8c7a .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2022/05/13 18:27 net-next-old b67fd3d9d942 107f6434 .config strace log report syz C ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/05/02 05:44 linux-next 92e815cf07ed 62df2017 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcm_write_msgs
2022/08/10 08:02 linux-next 6c8f479764eb c2a623d6 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root WARNING in kcm_write_msgs
2023/01/05 05:49 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 1dac8c7a .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in kcm_write_msgs
2020/04/20 19:40 upstream ae83d0b416db 347a5dc3 .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/04/19 02:11 upstream 90280eaa88ac 365fba24 .config console log report syz C ci-upstream-kasan-gce-root
2020/03/26 00:43 net-old 919a23e9d6cc 41f049cc .config console log report syz C ci-upstream-net-this-kasan-gce
2020/03/25 23:53 net-next-old 29f3490ba9d2 41f049cc .config console log report syz C ci-upstream-net-kasan-gce
2022/08/02 11:22 net-old a41b17ff9dac fef302b1 .config console log report syz ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/06/04 02:38 upstream 51f269a6ecc7 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/04/15 02:29 upstream 95abc817ab3a ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/15 01:14 upstream 95abc817ab3a ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/14 22:22 upstream 95abc817ab3a 3cfcaa1b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/14 21:02 upstream 95abc817ab3a 3cfcaa1b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/12 22:15 upstream 0bcc40255504 82d5e53e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/11 19:21 upstream 0d3eb744aed4 49faf98d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/07 17:56 upstream f2afccfefe7b f7ba566d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/07 00:24 upstream f2afccfefe7b 00ce4c67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/06 21:59 upstream f2afccfefe7b 00ce4c67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/05 19:54 upstream 99ddf2254feb 8b834965 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/05 12:44 upstream 76f598ba7d8e 831373d3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in kcm_write_msgs
2023/04/04 13:17 upstream 148341f0a2f5 928dd177 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/04 05:36 upstream 148341f0a2f5 7db618d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kcm_write_msgs
2023/04/03 21:45 upstream 148341f0a2f5 7db618d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/03 09:31 upstream 7e364e56293b 41147e3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/04/02 21:51 upstream 6ab608fe852b f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/04/02 19:01 upstream 6ab608fe852b f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/04/02 02:22 upstream 00c7b5f4ddc5 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/04/01 21:43 upstream 7b50567bdcad f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kcm_write_msgs
2023/03/31 11:55 upstream 62bad54b26db f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/03/29 20:32 upstream ffe78bbd5121 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/03/29 01:43 upstream fcd476ea6a88 fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2023/03/28 22:11 upstream fcd476ea6a88 48c74771 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/03/28 16:57 upstream 3a93e40326c8 48c74771 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/03/27 03:57 upstream 0ec57cfa721f fbf0499a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/03/26 14:50 upstream da8e7da11e4b fbf0499a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcm_write_msgs
2023/03/26 08:34 upstream da8e7da11e4b fbf0499a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcm_write_msgs
2022/11/18 09:55 upstream 84368d882b96 5bb70014 .config console log report info ci-qemu-upstream WARNING in kcm_write_msgs
2023/06/04 22:27 net 8cde87b007da a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/05/13 01:20 net 1e306ec49a1f ecca8a24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/04/21 20:25 net e375b503943f 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/04/15 23:43 net 3037933448f6 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/03/29 03:07 net 917fd7d6cdda fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/03/22 21:52 net 4107b8746d93 d846e076 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcm_write_msgs
2023/06/09 09:15 net-next 37ff78e977f1 7086cdb9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/05/28 09:05 net-next 75455b906d82 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/05/13 22:48 net-next 7eef636ecc58 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/19 06:52 net-next dce46f1b0cab 94b4184e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/18 11:46 net-next 3684a23b5aff 436577a9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/17 02:52 net-next e61caf04b9f8 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/14 23:26 net-next c11d2e718c79 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/11 13:05 net-next 9bc11460bea7 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/08 04:18 net-next 9ba3b26c0c96 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/06 06:06 net-next b536f32b5b03 8b834965 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/05 14:45 net-next 054fbf7ff814 8b834965 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/04/03 03:16 net-next 51aaa68222d6 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/03/31 21:56 net-next ee05d90d0ac7 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/03/29 09:52 net-next 163c2c705917 fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/03/27 22:16 net-next e5b42483ccce 47f3aaf1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/03/25 22:05 net-next bc77f7318da8 fbf0499a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcm_write_msgs
2023/03/29 06:56 linux-next 198925fae644 fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcm_write_msgs
2021/01/16 18:12 net-old bcd0cf19ef82 65a7a854 .config console log report info ci-upstream-net-this-kasan-gce
2020/03/15 04:32 net-old 94b18a87efdd 749688d2 .config console log report ci-upstream-net-this-kasan-gce
* Struck through repros no longer work on HEAD.