================================================================== BUG: KASAN: use-after-free in blkdev_bio_end_io+0x37e/0x430 fs/block_dev.c:301 Read of size 1 at addr ffff88809fc2a694 by task ksoftirqd/0/9 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc2+ #59 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 print_address_description+0x75/0x5b0 mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:482 kasan_report+0x26/0x50 mm/kasan/common.c:612 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 blkdev_bio_end_io+0x37e/0x430 fs/block_dev.c:301 bio_endio+0x4ff/0x570 block/bio.c:1830 req_bio_endio block/blk-core.c:239 [inline] blk_update_request+0x385/0xf80 block/blk-core.c:1424 blk_mq_end_request+0x42/0x80 block/blk-mq.c:557 end_cmd+0xeb/0x2d0 drivers/block/null_blk_main.c:622 null_complete_rq+0x1c/0x20 drivers/block/null_blk_main.c:649 blk_done_softirq+0x362/0x3e0 block/blk-softirq.c:37 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 run_ksoftirqd+0x64/0xf0 kernel/softirq.c:603 smpboot_thread_fn+0x62c/0xa70 kernel/smpboot.c:165 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 3589: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:487 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x1f5/0x2e0 mm/slab.c:3483 mempool_alloc_slab+0x4d/0x70 mm/mempool.c:513 mempool_alloc+0x15f/0x6c0 mm/mempool.c:393 bio_alloc_bioset+0x210/0x670 block/bio.c:477 __blkdev_direct_IO+0x29c/0x1310 fs/block_dev.c:363 blkdev_direct_IO+0xbe/0xd0 fs/block_dev.c:518 generic_file_read_iter+0x1ad3/0x21b0 mm/filemap.c:2323 blkdev_read_iter+0x12e/0x140 fs/block_dev.c:2013 call_read_iter include/linux/fs.h:1864 [inline] aio_read+0x362/0x4a0 fs/aio.c:1543 __io_submit_one fs/aio.c:1817 [inline] io_submit_one+0x742/0x1ac0 fs/aio.c:1862 __do_sys_io_submit fs/aio.c:1921 [inline] __se_sys_io_submit+0x18f/0x2d0 fs/aio.c:1891 __x64_sys_io_submit+0x7b/0x90 fs/aio.c:1891 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x81/0xf0 mm/slab.c:3693 mempool_free_slab+0x1d/0x30 mm/mempool.c:520 mempool_free+0xd5/0x350 mm/mempool.c:502 bio_put+0x35a/0x420 block/bio.c:253 bio_check_pages_dirty+0x404/0x4e0 block/bio.c:1703 blkdev_bio_end_io+0x345/0x430 fs/block_dev.c:330 bio_endio+0x4ff/0x570 block/bio.c:1830 req_bio_endio block/blk-core.c:239 [inline] blk_update_request+0x385/0xf80 block/blk-core.c:1424 blk_mq_end_request+0x42/0x80 block/blk-mq.c:557 end_cmd+0xeb/0x2d0 drivers/block/null_blk_main.c:622 null_complete_rq+0x1c/0x20 drivers/block/null_blk_main.c:649 blk_done_softirq+0x362/0x3e0 block/blk-softirq.c:37 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 The buggy address belongs to the object at ffff88809fc2a680 which belongs to the cache bio-1 of size 216 The buggy address is located 20 bytes inside of 216-byte region [ffff88809fc2a680, ffff88809fc2a758) The buggy address belongs to the page: page:ffffea00027f0a80 refcount:1 mapcount:0 mapping:ffff8880a5d30380 index:0xffff88809fc2a2c0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffff8880a5a4d338 ffffea0002969748 ffff8880a5d30380 raw: ffff88809fc2a2c0 ffff88809fc2a040 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809fc2a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809fc2a600: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809fc2a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809fc2a700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff88809fc2a780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================