Re: [syzbot] [bcachefs] KASAN: use-after-free Read in scatterwalk_copychunks

Re: [syzbot] [bcachefs] KASAN: use-after-free Read in scatterwalk_copychunks

[syzbot]

syzbot has bisected this issue to:

commit dc6f2eb000d76ac8f93f4d59a8012ddfccca927a
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date:   Wed Apr 17 05:26:02 2024 +0000

    bcachefs: make btree read errors silent during scan

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16629450980000
start commit:   9221b2819b8a Add linux-next specific files for 20240503
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15629450980000
console output: https://syzkaller.appspot.com/x/log.txt?x=11629450980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8ab537f51a6a0d98
dashboard link: https://syzkaller.appspot.com/bug?extid=8c4acf719c3fc41e8439
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111abc97180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10059004980000

Reported-by: syzbot+8c4acf719c3fc41e8439@syzkaller.appspotmail.com
Fixes: dc6f2eb000d7 ("bcachefs: make btree read errors silent during scan")

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

Re: [syzbot] [bcachefs] KASAN: use-after-free Read in scatterwalk_copychunks

[syzbot]

syzbot suspects this issue was fixed by commit:

commit bcf77a05fb3d6210026483703bcacb22ed961c99
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date:   Fri Nov 8 05:25:18 2024 +0000

    bcachefs: Fix hidden btree errors when reading roots

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10dab1b3980000
start commit:   da4373fbcf00 Merge tag 'thermal-6.12-rc7' of git://git.ker..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=347f0ef7656eeb41
dashboard link: https://syzkaller.appspot.com/bug?extid=8c4acf719c3fc41e8439
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1579235f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1379235f980000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: bcachefs: Fix hidden btree errors when reading roots

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