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================================================================== BUG: KCSAN: data-race in __kernfs_remove / cleanup_glue_dir write to 0xffff888101c17bc0 of 8 bytes by task 13333 on cpu 1: kernfs_unlink_sibling fs/kernfs/dir.c:397 [inline] __kernfs_remove+0x592/0x6d0 fs/kernfs/dir.c:1359 kernfs_remove+0x1d/0x30 fs/kernfs/dir.c:1385 sysfs_remove_dir+0x92/0xb0 fs/sysfs/dir.c:102 __kobject_del lib/kobject.c:620 [inline] kobject_del+0xb7/0x110 lib/kobject.c:643 device_del+0x845/0x8c0 drivers/base/core.c:3595 device_unregister+0x11/0x30 drivers/base/core.c:3616 bdi_unregister+0x202/0x270 mm/backing-dev.c:952 del_gendisk+0x221/0x3e0 block/genhd.c:609 loop_remove drivers/block/loop.c:2419 [inline] loop_control_remove drivers/block/loop.c:2476 [inline] loop_control_ioctl+0x3c1/0x430 drivers/block/loop.c:2514 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888101c17bc0 of 8 bytes by task 13337 on cpu 0: kobject_has_children include/linux/kobject.h:135 [inline] cleanup_glue_dir+0xce/0x140 drivers/base/core.c:3097 device_del+0x850/0x8c0 drivers/base/core.c:3596 device_unregister+0x11/0x30 drivers/base/core.c:3616 bdi_unregister+0x202/0x270 mm/backing-dev.c:952 del_gendisk+0x221/0x3e0 block/genhd.c:609 loop_remove drivers/block/loop.c:2419 [inline] loop_control_remove drivers/block/loop.c:2476 [inline] loop_control_ioctl+0x3c1/0x430 drivers/block/loop.c:2514 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000002 -> 0x0000000000000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13337 Comm: syz-executor.4 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021/10/20 14:45 | upstream | d9abdee5fd5a | 418a00eb | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in __kernfs_remove / cleanup_glue_dir |