Hello,
syzbot found the following crash on:
HEAD commit: 1e78030e Merge tag 'mmc-v5.3-rc1' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15286cdc600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e397351d2615e10
dashboard link: https://syzkaller.appspot.com/bug?extid=2a99a1bb75e9116ec20c
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=150799e8600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16aaa8c4600000
The bug was bisected to:
commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Author: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Date: Thu Jul 4 00:21:13 2019 +0000
hsr: implement dellink to clean up resources
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15efbeec600000
final crash: https://syzkaller.appspot.com/x/report.txt?x=17efbeec600000
console output: https://syzkaller.appspot.com/x/log.txt?x=13efbeec600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2a99a1bb75e9116ec20c@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")
==================================================================
BUG: KASAN: use-after-free in blkdev_bio_end_io+0x37e/0x430
fs/block_dev.c:301
Read of size 1 at addr ffff8880a40928d4 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 9743:
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 ffff8880a40928c0
which belongs to the cache bio-1 of size 216
The buggy address is located 20 bytes inside of
216-byte region [ffff8880a40928c0, ffff8880a4092998)
The buggy address belongs to the page:
page:ffffea0002902480 refcount:1 mapcount:0 mapping:ffff8880a5ad0c40
index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002862888 ffffea000264a1c8 ffff8880a5ad0c40
raw: 0000000000000000 ffff8880a4092000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a4092780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880a4092800: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
ffff8880a4092880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff8880a4092900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a4092980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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