[f2fs-dev] [Bug 219484] f2fs discard causes kernel NULL pointer dereferencing

[bugzilla-daemon--- via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

https://bugzilla.kernel.org/show_bug.cgi?id=219484

--- Comment #6 from Chao Yu (chao@kernel.org) ---
Sorry for long delay due to I'm out of office.

Now, I can reproduce this bug w/ below testcase:
- pvcreate /dev/vdb
- vgcreate myvg1 /dev/vdb
- lvcreate -L 1024m -n mylv1 myvg1
- mount /dev/myvg1/mylv1 /mnt/f2fs
- dd if=/dev/zero of=/mnt/f2fs/file bs=1M count=20
- sync
- rm /mnt/f2fs/file
- sync
- lvcreate -L 1024m -s -n mylv1-snapshot /dev/myvg1/mylv1
- umount /mnt/f2fs

------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:1363!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 4 UID: 0 PID: 730 Comm: umount Not tainted 6.12.0-rc3+ #1107
RIP: 0010:__submit_discard_cmd+0xa53/0x1410
<TASK>
__issue_discard_cmd+0x3e5/0x1190
f2fs_issue_discard_timeout+0x244/0x360
f2fs_put_super+0x1fc/0xed0
generic_shutdown_super+0x14c/0x4a0
kill_block_super+0x40/0x90
kill_f2fs_super+0x264/0x430

Let me figure out a patch for that soon.:)

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