Re: [syzbot] [raid?] kernel BUG in raid5_run

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    5acbae5f7eb3 Merge tag 'powerpc-7.3-2' of git://git.kernel..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1574d749580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f
dashboard link: https://syzkaller.appspot.com/bug?extid=1f5a7de91d547763f4c8
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1774d749580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f5a7de91d547763f4c8@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
kernel BUG at drivers/md/raid5.c:8117!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 6026 Comm: syz-executor387 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:raid5_run+0x11a7/0x1670 drivers/md/raid5.c:8117
Code: 03 00 00 41 8b ae d0 01 00 00 31 ff 89 ee e8 f0 f6 82 f9 48 c7 44 24 10 00 00 00 00 85 ed 0f 84 44 f4 ff ff e8 6a fc 82 f9 90 <0f> 0b e8 62 fc 82 f9 49 8d 86 e0 00 00 00 48 89 c2 48 89 44 24 60
RSP: 0018:ffffc90003c879f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802bdb2580 RSI: ffffffff888914a6 RDI: ffff88802bdb2580
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000008
R13: 0000000000000000 R14: ffff88802cfb0000 R15: ffff88802cfb0028
FS:  00005555884d2400(0000) GS:ffff8880d5d5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff95c66058 CR3: 000000005631b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 md_run+0xc2f/0x2510 drivers/md/md.c:6779
 do_md_run+0x36/0x660 drivers/md/md.c:6880
 array_state_store+0x9c5/0xcf0 drivers/md/md.c:4765
 md_attr_store+0x1c5/0x330 drivers/md/md.c:6158
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe6b68b8a77
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd56632d40 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00005555884d2400 RCX: 00007fe6b68b8a77
RDX: 0000000000000006 RSI: 00007fe6b68f21aa RDI: 0000000000000003
RBP: 0000000000000032 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fe6b68f21aa
R13: 00007fe6b68f4500 R14: 0000000000000002 R15: 00007fe6b68f44b0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:raid5_run+0x11a7/0x1670 drivers/md/raid5.c:8117
Code: 03 00 00 41 8b ae d0 01 00 00 31 ff 89 ee e8 f0 f6 82 f9 48 c7 44 24 10 00 00 00 00 85 ed 0f 84 44 f4 ff ff e8 6a fc 82 f9 90 <0f> 0b e8 62 fc 82 f9 49 8d 86 e0 00 00 00 48 89 c2 48 89 44 24 60
RSP: 0018:ffffc90003c879f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802bdb2580 RSI: ffffffff888914a6 RDI: ffff88802bdb2580
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000008
R13: 0000000000000000 R14: ffff88802cfb0000 R15: ffff88802cfb0028
FS:  00005555884d2400(0000) GS:ffff8880d5d5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff95c66058 CR3: 000000005631b000 CR4: 0000000000352ef0


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