syzbot

 sign-in | mailing list | source | docs
🐞 Open [1436]
≡ Subsystems
🐞 Fixed [6906]
🐞 Invalid [17981]
⬇ Missing Backports [223]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in __dentry_kill / d_set_d_op (15)

Status: auto-obsoleted due to no activity on 2023/10/24 14:04
Subsystems: fs
[Documentation on labels]
First crash: 934d, last: 874d
▶ ▼ Similar bugs (19)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (9) fs 6 1 1465d 1465d 0/29 auto-closed as invalid on 2022/03/12 00:21
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (17) fs 6 1 662d 662d 0/29 auto-obsoleted due to no activity on 2024/05/23 05:15
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (7) fs 6 2 1701d 1734d 0/29 auto-closed as invalid on 2021/07/19 11:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (3) fs 6 6 2073d 2113d 0/29 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (2) fs 6 9 2202d 2272d 0/29 auto-closed as invalid on 2020/04/08 20:57
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (5) fs 6 1 1921d 1890d 0/29 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (10) fs 6 5 1365d 1426d 0/29 auto-closed as invalid on 2022/06/20 15:46
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (14) fs 6 1 969d 969d 0/29 auto-obsoleted due to no activity on 2023/07/21 00:16
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (4) fs 6 3 2002d 2021d 0/29 auto-closed as invalid on 2020/09/21 06:01
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (11) fs 6 1 1325d 1325d 0/29 auto-closed as invalid on 2022/07/30 10:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (6) fs 6 1 1792d 1792d 0/29 auto-closed as invalid on 2021/04/18 21:16
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (16) fs 6 6 771d 792d 0/29 auto-obsoleted due to no activity on 2024/02/04 06:56
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (12) fs 6 3 1230d 1275d 0/29 auto-obsoleted due to no activity on 2022/11/02 16:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (20) fs 6 3 231d 306d 0/29 auto-obsoleted due to no activity on 2025/08/18 00:28
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (8) fs 6 13 1504d 1661d 0/29 auto-closed as invalid on 2022/02/01 06:29
upstream KCSAN: data-race in __dentry_kill / d_set_d_op fs 6 3 2283d 2290d 0/29 closed as invalid on 2019/11/19 14:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (18) fs 6 4 549d 592d 0/29 auto-obsoleted due to no activity on 2024/09/13 03:18
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (13) fs 6 4 1081d 1140d 0/29 auto-obsoleted due to no activity on 2023/04/04 19:35
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (19) fs 6 1 429d 429d 0/29 auto-obsoleted due to no activity on 2025/02/01 04:42

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

read-write to 0xffff88813bd41300 of 4 bytes by task 11801 on cpu 0:
 d_set_d_op+0x150/0x1e0 fs/dcache.c:1935
 simple_lookup+0x7c/0xa0 fs/libfs.c:75
 lookup_open fs/namei.c:3473 [inline]
 open_last_lookups fs/namei.c:3563 [inline]
 path_openat+0xc4f/0x1d10 fs/namei.c:3793
 do_filp_open+0xf6/0x200 fs/namei.c:3823
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813bd41300 of 4 bytes by task 14191 on cpu 1:
 dentry_unlist fs/dcache.c:572 [inline]
 __dentry_kill+0x237/0x4a0 fs/dcache.c:603
 dentry_kill+0x8d/0x1e0
 dput+0x118/0x1f0 fs/dcache.c:913
 handle_mounts fs/namei.c:1554 [inline]
 step_into+0x21a/0x800 fs/namei.c:1839
 open_last_lookups fs/namei.c:3586 [inline]
 path_openat+0x10bb/0x1d10 fs/namei.c:3793
 do_filp_open+0xf6/0x200 fs/namei.c:3823
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14191 Comm: udevd Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
==================================================================
I/O error, dev loop5, sector 8064 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop5, sector 8064 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop5p4, logical block 1008, async page read
udevd[14191]: inotify_add_watch(7, /dev/loop5p15, 10) failed: No such file or directory

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/19 13:56 upstream 2cf0f7156238 0b6a67ac .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/09/11 13:43 upstream 0bb80ecc33a8 59da8366 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/09/10 00:04 upstream 6099776f9f26 6654cf89 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/09/01 13:36 upstream 99d99825fc07 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/22 02:09 upstream f7757129e3de 6b415825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/19 07:30 upstream d4ddefee5160 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/16 18:37 upstream 4853c74bd7ab 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/11 19:13 upstream 9106536c1aa3 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/07 18:58 upstream a027b2eca0b7 b1b6ae3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/06 17:23 upstream f0ab9f34e59e 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/08/05 12:43 upstream 024ff300db33 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/07/22 02:47 upstream f7e3a1bafdea abdf9bae .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2023/07/21 14:45 upstream 57f1f9dd3abe 28847498 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
* Struck through repros no longer work on HEAD.