syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1341]
≡ Subsystems
🐞 Fixed [7059]
🐞 Invalid [18499]
⬇ Missing Backports [222]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

KCSAN: data-race in do_sendfile / do_sendfile (9)

Status: auto-obsoleted due to no activity on 2024/10/20 07:46
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+5c45795ba983659a033a@syzkaller.appspotmail.com
First crash: 577d, last: 577d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_sendfile / do_sendfile (3) fs 6 1 1194d 1194d 0/29 auto-obsoleted due to no activity on 2023/03/17 22:50
upstream KCSAN: data-race in do_sendfile / do_sendfile (4) fs 6 4 1083d 1106d 0/29 auto-obsoleted due to no activity on 2023/06/02 10:13
upstream KCSAN: data-race in do_sendfile / do_sendfile fs 6 2 1517d 1533d 0/29 auto-closed as invalid on 2022/03/24 16:27
upstream KCSAN: data-race in do_sendfile / do_sendfile (7) fs 6 5 807d 856d 0/29 auto-obsoleted due to no activity on 2024/03/03 18:17
upstream KCSAN: data-race in do_sendfile / do_sendfile (6) fs 6 1 953d 953d 0/29 auto-obsoleted due to no activity on 2023/10/10 12:26
upstream KCSAN: data-race in do_sendfile / do_sendfile (10) fs 6 26 101d 517d 0/29 auto-obsoleted due to no activity on 2026/03/01 02:25
upstream KCSAN: data-race in do_sendfile / do_sendfile (5) fs 6 3 993d 1015d 0/29 auto-obsoleted due to no activity on 2023/08/30 17:21
upstream KCSAN: data-race in do_sendfile / do_sendfile (8) fs 6 2 632d 656d 0/29 auto-obsoleted due to no activity on 2024/08/25 22:44
upstream KCSAN: data-race in do_sendfile / do_sendfile (2) fs 6 1 1333d 1333d 0/29 auto-closed as invalid on 2022/09/24 23:59

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

write to 0xffff888104202340 of 8 bytes by task 20670 on cpu 1:
 do_sendfile+0x76d/0x950
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888104202340 of 8 bytes by task 20667 on cpu 0:
 do_sendfile+0x76d/0x950
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0x0000000000007fdc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 20667 Comm: syz.1.5430 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/15 07:45 upstream 0babf683783d 08d8a733 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
* Struck through repros no longer work on HEAD.