syzbot

 sign-in | mailing list | source | docs
🐞 Open [1002] ≡ Subsystems 🐞 Fixed [5246] 🐞 Invalid [12540] ⬇ Missing Backports [83] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (8)

Status: moderation: reported on 2024/04/12 14:56
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+a32532c62da295dfd72b@syzkaller.appspotmail.com
First crash: 17d, last: 11d
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (4) usb 1 569d 569d 0/26 auto-obsoleted due to no activity on 2022/11/12 18:04
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl usb 1 1270d 1239d 0/26 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (3) usb 2 760d 789d 0/26 auto-closed as invalid on 2022/05/06 03:42
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (7) usb 2 77d 98d 0/26 auto-obsoleted due to no activity on 2024/03/18 17:20
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (2) usb 1 889d 889d 0/26 auto-closed as invalid on 2021/12/27 18:11
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (5) usb 1 377d 377d 0/26 auto-obsoleted due to no activity on 2023/05/23 16:35
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (6) usb 1 314d 314d 0/26 auto-obsoleted due to no activity on 2023/07/25 21:09

Sample crash report:
BUG: KCSAN: data-race in usbdev_ioctl / usbdev_ioctl

write to 0xffff888102202130 of 8 bytes by task 17800 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1566 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2815 [inline]
 usbdev_ioctl+0x6c2/0x3e10 drivers/usb/core/devio.c:2824
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:890
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890
 x64_sys_call+0x155d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888102202130 of 8 bytes by task 17810 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1566 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2815 [inline]
 usbdev_ioctl+0x6c2/0x3e10 drivers/usb/core/devio.c:2824
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:890
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890
 x64_sys_call+0x155d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000012d9c92f -> 0x0000000015d51b58

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17810 Comm: syz-executor.3 Tainted: G        W          6.9.0-rc4-syzkaller-00113-g2668e3ae2ef3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/18 21:50 upstream 2668e3ae2ef3 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in usbdev_ioctl / usbdev_ioctl
2024/04/15 16:08 upstream 0bbac3facb5d b9af7e61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in usbdev_ioctl / usbdev_ioctl
2024/04/15 08:10 upstream 0bbac3facb5d c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in usbdev_ioctl / usbdev_ioctl
2024/04/12 14:55 upstream 586b5dfb51b9 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in usbdev_ioctl / usbdev_ioctl
* Struck through repros no longer work on HEAD.