syzbot

 sign-in | mailing list | source | docs
🐞 Open [1502]
≡ Subsystems
🐞 Fixed [6625]
🐞 Invalid [16952]
⬇ Missing Backports [210]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (7)

Status: auto-obsoleted due to no activity on 2024/03/18 17:20
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+4347ba56278e2fa39976@syzkaller.appspotmail.com
First crash: 619d, last: 598d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (4) usb 6 1 1090d 1090d 0/29 auto-obsoleted due to no activity on 2022/11/12 18:04
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (8) usb 6 4 532d 538d 0/29 auto-obsoleted due to no activity on 2024/05/23 21:51
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (12) usb 6 2 98d 148d 0/29 auto-obsoleted due to no activity on 2025/08/21 21:41
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (13) usb 6 1 9d10h 9d10h 0/29 moderation: reported on 2025/09/23 12:23
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl usb 6 1 1790d 1760d 0/29 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (3) usb 6 2 1280d 1310d 0/29 auto-closed as invalid on 2022/05/06 03:42
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (2) usb 6 1 1410d 1410d 0/29 auto-closed as invalid on 2021/12/27 18:11
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (5) usb 6 1 898d 898d 0/29 auto-obsoleted due to no activity on 2023/05/23 16:35
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (10) usb 6 3 345d 390d 0/29 auto-obsoleted due to no activity on 2024/12/17 19:31
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (11) usb 6 2 253d 272d 0/29 auto-obsoleted due to no activity on 2025/03/19 22:59
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (9) usb 6 3 438d 484d 0/29 auto-obsoleted due to no activity on 2024/08/25 21:37
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (6) usb 6 1 835d 835d 0/29 auto-obsoleted due to no activity on 2023/07/25 21:09

Sample crash report:
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
==================================================================
BUG: KCSAN: data-race in usbdev_ioctl / usbdev_ioctl

write to 0xffff888101eca710 of 8 bytes by task 3766 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1541 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2815 [inline]
 usbdev_ioctl+0x6c0/0x3e00 drivers/usb/core/devio.c:2824
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 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+0x63/0x6b

write to 0xffff888101eca710 of 8 bytes by task 3762 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1541 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2815 [inline]
 usbdev_ioctl+0x6c0/0x3e00 drivers/usb/core/devio.c:2824
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 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+0x63/0x6b

value changed: 0x000000001e5bd65f -> 0x000000001ef46cdf

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3762 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0
vhci_hcd: default hub control req: 0000 v0000 i0000 l0

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/12 17:19 upstream 841c35169323 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in usbdev_ioctl / usbdev_ioctl
2024/01/22 21:14 upstream 6613476e225e 9bd8dcda .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.