syzbot


KCSAN: data-race in vfs_readlink / vfs_unlink (2)

Status: auto-closed as invalid on 2021/07/07 22:03
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+d64a7b91f17b590f54c3@syzkaller.appspotmail.com
First crash: 1361d, last: 1020d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in vfs_readlink / vfs_unlink fs 12 1399d 1561d 0/26 closed as invalid on 2020/06/18 14:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in vfs_readlink / vfs_unlink

write to 0xffff88812e90fcc0 of 4 bytes by task 10952 on cpu 1:
 dont_mount include/linux/dcache.h:358 [inline]
 vfs_unlink+0x289/0x400 fs/namei.c:4027
 do_unlinkat+0x238/0x4f0 fs/namei.c:4092
 __do_sys_unlink fs/namei.c:4139 [inline]
 __se_sys_unlink fs/namei.c:4137 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812e90fcc0 of 4 bytes by task 1034 on cpu 0:
 __d_entry_type include/linux/dcache.h:395 [inline]
 d_is_symlink include/linux/dcache.h:425 [inline]
 vfs_readlink+0x1c5/0x280 fs/namei.c:4785
 do_readlinkat+0x170/0x200 fs/stat.c:437
 __do_sys_readlink fs/stat.c:458 [inline]
 __se_sys_readlink fs/stat.c:455 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:455
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00600008 -> 0x00600108

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1034 Comm: systemd-udevd Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (246):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/06/02 22:03 upstream 324c92e5e0ee 0740de69 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/31 21:18 upstream c2131f7e73c9 032639db .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/31 14:22 upstream 8124c8a6b353 032639db .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/31 03:12 upstream 8124c8a6b353 325a8dab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/30 06:44 upstream b90e90f40b4f 325a8dab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/29 20:46 upstream f956cb99b938 325a8dab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/29 00:53 upstream 5ff2756afde0 858ea628 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/28 09:42 upstream 97e5bf604b7a 858ea628 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/27 15:10 upstream d7c5303fbc8a 858ea628 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/26 23:13 upstream 7ac3a1c1ae51 858ea628 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/26 10:14 upstream ad9f25d33860 750ce164 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/26 03:19 upstream a050a6d2b7e8 93d3a9f6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/25 07:55 upstream 1434a3127887 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/24 17:36 upstream c4681547bcce 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/24 02:33 upstream 6ebb6814a1ef 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/23 08:06 upstream 4d7620341eda 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/22 23:19 upstream 23d729263037 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/22 06:25 upstream 45af60e7ced0 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/21 16:58 upstream 79a106fc6585 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/21 02:12 upstream ba816d3c265c 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/20 19:55 upstream f01da525b3de c560a65d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/19 22:30 upstream c3d0e3fd41b7 a343ba6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/18 00:01 upstream 8ac91e6c6033 a343ba6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/17 10:24 upstream d07f6ca923ea a2eb125d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/17 08:18 upstream d07f6ca923ea f54a5c09 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/16 16:33 upstream 63d1cb53e26a f54a5c09 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/16 06:29 upstream c12a29ed9094 f54a5c09 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/15 13:09 upstream 25a1298726e9 93f844de .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/14 23:59 upstream bd3c9cdb21a2 8bdd5343 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/14 07:16 upstream 315d99318179 8bdd5343 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/13 20:31 upstream c06a2ba62fc4 ecb594cb .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/12 21:19 upstream dbb5afad100a ed7d41c5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/12 10:49 upstream 88b06399c9c7 86294427 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/11 21:29 upstream 88b06399c9c7 b3c3bb8e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/11 02:50 upstream 1140ab592e2e ca873091 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/10 13:41 upstream 6efb943b8616 ca873091 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/10 11:18 upstream 6efb943b8616 bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/10 08:14 upstream 9819f682e48c bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/09 00:59 upstream b741596468b0 bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/08 15:54 upstream dd860052c99b bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/08 02:08 upstream 1ad77a05cfae bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/07 10:30 upstream e48661230cc3 f6da8120 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/07 07:02 upstream e48661230cc3 06585184 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/06 16:28 upstream 8404c9fbc84b 06585184 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/06 03:00 upstream a79cdfba68a1 06c27ff5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/05 06:48 upstream d665ea6ea86c 06c27ff5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/05/04 16:20 upstream 5e321ded302d 06c27ff5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in vfs_readlink / vfs_unlink
2021/01/17 10:02 upstream 0da0a8a0a0e1 813be542 .config console log report info ci2-upstream-kcsan-gce
2020/09/23 22:04 upstream 805c6d3c1921 54289b08 .config console log report info ci2-upstream-kcsan-gce
2020/06/26 15:34 upstream 4a21185cda0f 9506ea6d .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.