Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

[syzbot]

syzbot has bisected this bug to:

commit 768134d4f48109b90f4248feecbeeb7d684e410c
Author: Jens Axboe <axboe@kernel.dk>
Date:   Mon Nov 11 03:30:53 2019 +0000

    io_uring: don't do flush cancel under inflight_lock

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000
start commit:   1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692
dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000

Reported-by: syzbot+313d95e8a7a49263f88d@syzkaller.appspotmail.com
Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

[Bart Van Assche]

On 2020-03-26 18:28, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 768134d4f48109b90f4248feecbeeb7d684e410c
> Author: Jens Axboe <axboe@kernel.dk>
> Date:   Mon Nov 11 03:30:53 2019 +0000
> 
>     io_uring: don't do flush cancel under inflight_lock
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000
> start commit:   1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692
> dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000
> 
> Reported-by: syzbot+313d95e8a7a49263f88d@syzkaller.appspotmail.com
> Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection


#syz fix: blk-mq: Fix a recently introduced regression in
blk_mq_realloc_hw_ctxs()

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

[Jens Axboe]

On 3/26/20 7:28 PM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 768134d4f48109b90f4248feecbeeb7d684e410c
> Author: Jens Axboe <axboe@kernel.dk>
> Date:   Mon Nov 11 03:30:53 2019 +0000
> 
>     io_uring: don't do flush cancel under inflight_lock

This is definitely an utterly bogus bisect, not related at all.

-- 
Jens Axboe

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

[syzbot]

This bug is marked as fixed by commit:
blk-mq: Fix a recently introduced regression in
But I can't find it in any tested tree for more than 90 days.
Is it a correct commit? Please update it by replying:
#syz fix: exact-commit-title
Until then the bug is still considered open and
new crashes with the same signature are ignored.

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

[Bart Van Assche]

On 2020-06-24 20:01, syzbot wrote:
> This bug is marked as fixed by commit:
> blk-mq: Fix a recently introduced regression in
> But I can't find it in any tested tree for more than 90 days.
> Is it a correct commit? Please update it by replying:
> #syz fix: exact-commit-title
> Until then the bug is still considered open and
> new crashes with the same signature are ignored.

#syz fix: blk-mq: Fix a recently introduced regression in blk_mq_realloc_hw_ctxs()