syzbot

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BUG: KCSAN: data-race in usbdev_ioctl / usbdev_ioctl

write to 0xffff8881021a3540 of 4 bytes by task 15000 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1624 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2818 [inline]
 usbdev_ioctl+0x5f3/0x1700 drivers/usb/core/devio.c:2827
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff8881021a3540 of 4 bytes by task 15007 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1624 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2818 [inline]
 usbdev_ioctl+0x5f3/0x1700 drivers/usb/core/devio.c:2827
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x388bef8e -> 0x3b86e00e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15007 Comm: syz.3.4166 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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