KCSAN: data-race in loop_configure / loop_configure (2)

Status: auto-obsoleted due to no activity on 2022/11/21 10:52
Subsystems: block
[Documentation on labels]
First crash: 1431d, last: 1394d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in loop_configure / loop_configure block 6 1 1488d 1488d 0/29 auto-closed as invalid on 2022/08/20 07:48

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

read-write to 0xffff8881023c9784 of 1 bytes by task 19359 on cpu 0:
 dev_set_uevent_suppress include/linux/device.h:781 [inline]
 loop_configure+0x25b/0xc30 drivers/block/loop.c:1121
 lo_ioctl+0x641/0x1290
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read-write to 0xffff8881023c9784 of 1 bytes by task 19356 on cpu 1:
 dev_set_uevent_suppress include/linux/device.h:781 [inline]
 loop_configure+0x25b/0xc30 drivers/block/loop.c:1121
 lo_ioctl+0x641/0x1290
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x17 -> 0x07

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19356 Comm: syz-executor.4 Not tainted 6.0.0-syzkaller-12255-g2df76606db9d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/17 10:42 upstream 2df76606db9d 67cb024c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in loop_configure / loop_configure
2022/10/03 13:31 upstream a962b54e162c feb56351 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in loop_configure / loop_configure
2022/09/10 12:25 upstream ce888220d5c7 356d8217 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in loop_configure / loop_configure
* Struck through repros no longer work on HEAD.