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KCSAN: data-race in __dentry_kill / lookup_fast (7)

Status: auto-obsoleted due to no activity on 2023/02/12 11:35
Subsystems: fs
[Documentation on labels]
First crash: 775d, last: 514d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __dentry_kill / lookup_fast (5) fs 12 1093d 1165d 0/26 auto-closed as invalid on 2021/07/05 09:49
upstream KCSAN: data-race in __dentry_kill / lookup_fast (8) fs 8 404d 467d 0/26 auto-obsoleted due to no activity on 2023/05/25 00:07
upstream KCSAN: data-race in __dentry_kill / lookup_fast (2) fs 5 1374d 1434d 0/26 auto-closed as invalid on 2020/09/27 09:27
upstream KCSAN: data-race in __dentry_kill / lookup_fast fs 10 1456d 1550d 0/26 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __dentry_kill / lookup_fast (10) fs 3 58d 95d 0/26 auto-obsoleted due to no activity on 2024/05/05 12:07
upstream KCSAN: data-race in __dentry_kill / lookup_fast (6) fs 1 920d 920d 0/26 auto-closed as invalid on 2021/12/25 02:52
upstream KCSAN: data-race in __dentry_kill / lookup_fast (4) fs 3 1213d 1238d 0/26 auto-closed as invalid on 2021/03/06 20:57
upstream KCSAN: data-race in __dentry_kill / lookup_fast (3) fs 3 1275d 1268d 0/26 auto-closed as invalid on 2021/01/03 16:37
upstream KCSAN: data-race in __dentry_kill / lookup_fast (9) fs 31 136d 171d 0/26 auto-obsoleted due to no activity on 2024/02/17 10:11

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff88810aa8f840 of 4 bytes by task 4887 on cpu 1:
 dentry_unlist fs/dcache.c:547 [inline]
 __dentry_kill+0x13f/0x450 fs/dcache.c:603
 dentry_kill+0x8d/0x1e0
 dput+0x11e/0x1f0 fs/dcache.c:913
 do_unlinkat+0x288/0x510 fs/namei.c:4323
 __do_sys_unlink fs/namei.c:4368 [inline]
 __se_sys_unlink fs/namei.c:4366 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4366
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810aa8f840 of 4 bytes by task 2738 on cpu 0:
 d_revalidate fs/namei.c:855 [inline]
 lookup_fast+0xca/0x270 fs/namei.c:1634
 walk_component+0x3f/0x230 fs/namei.c:1989
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x11d/0x2b0 fs/namei.c:2474
 filename_lookup+0x133/0x310 fs/namei.c:2503
 user_path_at_empty+0x3e/0x110 fs/namei.c:2876
 do_readlinkat+0x98/0x210 fs/stat.c:471
 __do_sys_readlink fs/stat.c:504 [inline]
 __se_sys_readlink fs/stat.c:501 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:501
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00600008 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2738 Comm: udevd Not tainted 6.2.0-rc1-syzkaller-00043-g2258c2dc850b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================

Crashes (27):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/30 16:11 upstream 2258c2dc850b 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/12/20 05:29 upstream aeba12b26c79 c52b2efb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/12/14 14:27 upstream e2ca6ba6ba01 b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/12/13 19:41 upstream 764822972d64 f6511626 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/11/28 13:43 upstream b7b275e60bcd 247de55b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/11/27 05:06 upstream 644e9524388a f4470a7b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/11/22 10:57 upstream eb7081409f94 1c576c23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/11/20 04:44 upstream fe24a97cf254 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/11/02 11:33 upstream f526d6a82242 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/10/31 12:12 upstream b72018ab8236 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/10/08 14:11 upstream 62e6e5940c0c aea5da89 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/10/01 06:48 upstream 70575e77839f feb56351 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/09/27 03:37 upstream 3800a713b607 d59ba983 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/09/26 17:12 upstream f76349cf4145 d59ba983 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/09/09 11:59 upstream 506357871c18 90058bdc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/09/01 10:39 upstream c5e4d5e99162 b01ec571 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/08/07 10:50 upstream 1612c382ffbd 88e3a122 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/07/19 05:01 upstream 80e19f34c288 ff988920 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/07/17 07:57 upstream 972a278fe60c 95cb00d1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/06/29 23:54 upstream d9b2ba67917c 1434eec0 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/06/28 11:27 upstream 941e3e791269 ef82eb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/06/16 08:25 upstream 30306f6194ca 1719ee24 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/05/27 15:53 upstream 7e284070abe5 116e7a7b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/05/18 09:20 upstream 210e04ff7681 744a39e2 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/05/02 16:48 upstream 672c0c517342 2df221f6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/04/19 22:27 upstream b7f73403a3e9 33fc6ed6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
2022/04/14 04:26 upstream a19944809fe9 b17b2923 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / lookup_fast
* Struck through repros no longer work on HEAD.