syzbot

 sign-in | mailing list | source | docs
🐞 Open [1602]
≡ Subsystems
🐞 Fixed [6289]
🐞 Invalid [15993]
⬇ Missing Backports [189]
≡ 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: 507d, last: 486d
▶ ▼ Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (4) usb 1 978d 978d 0/28 auto-obsoleted due to no activity on 2022/11/12 18:04
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (8) usb 4 420d 426d 0/28 auto-obsoleted due to no activity on 2024/05/23 21:51
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (12) usb 1 36d 36d 0/28 moderation: reported on 2025/05/07 21:33
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl usb 1 1679d 1648d 0/28 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (3) usb 2 1168d 1198d 0/28 auto-closed as invalid on 2022/05/06 03:42
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (2) usb 1 1298d 1298d 0/28 auto-closed as invalid on 2021/12/27 18:11
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (5) usb 1 786d 786d 0/28 auto-obsoleted due to no activity on 2023/05/23 16:35
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (10) usb 3 233d 278d 0/28 auto-obsoleted due to no activity on 2024/12/17 19:31
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (11) usb 2 141d 160d 0/28 auto-obsoleted due to no activity on 2025/03/19 22:59
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (9) usb 3 326d 372d 0/28 auto-obsoleted due to no activity on 2024/08/25 21:37
upstream KCSAN: data-race in usbdev_ioctl / usbdev_ioctl (6) usb 1 723d 723d 0/28 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.