Hello, As part of the kernel research at ASU's SEFCOM lab, we hit the crash below. Crash reports can be found here:
https://github.com/farhad-alemi/public_bug_reports/tree/main/169-kasan-null-ptr-deref-read-in-dm-kcopyd-client-destroy/ workqueue: Failed to create a rescuer kthread for wq "kcopyd": -EINTR BUG: KASAN: null-ptr-deref in dm_kcopyd_client_destroy+0x9e/0x480 drivers/md/dm-kcopyd.c:980 Read of size 4 at addr 00000000000000a4 by task syz.2.409/14796 Call Trace: dm_kcopyd_client_destroy+0x9e/0x480 drivers/md/dm-kcopyd.c:980 __destroy+0x172/0x2f0 drivers/md/dm-cache-target.c:1969 cache_create drivers/md/dm-cache-target.c:2600 [inline] cache_ctr+0x1614/0x2af0 drivers/md/dm-cache-target.c:2645 dm_table_add_target+0x5c9/0xce0 drivers/md/dm-table.c:749 populate_table drivers/md/dm-ioctl.c:1509 [inline] table_load+0x2f9/0x810 drivers/md/dm-ioctl.c:1551 ctl_ioctl drivers/md/dm-ioctl.c:2115 [inline] Our reproducer.c is available upon request. Happy to test a patch if that would help. Regards,
