Re: [syzbot] [raid?] UBSAN: array-index-out-of-bounds in super_90_sync

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: array-index-out-of-bounds in super_90_sync

loop0: detected capacity change from 0 to 4096
md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in drivers/md/md.c:1702:17
index 124 is out of range for type 'mdp_disk_t [27]'
CPU: 3 UID: 0 PID: 6041 Comm: syz-executor385 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
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xcc/0xf0 lib/ubsan.c:455
 super_90_sync+0x1eed/0x1ff0 drivers/md/md.c:1702
 sync_super drivers/md/md.c:2510 [inline]
 sync_sbs drivers/md/md.c:2752 [inline]
 md_update_sb+0xbba/0x2840 drivers/md/md.c:2928
 state_store+0x31e/0x1340 drivers/md/md.c:3250
 rdev_attr_store+0x1d9/0x560 drivers/md/md.c:3773
 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: 0033:0x7ff84eda46f7
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:00007ffd0ac102f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00005555643c0400 RCX: 00007ff84eda46f7
RDX: 0000000000000008 RSI: 00007ff84ede0c12 RDI: 0000000000000003
RBP: 00007ff84ede0c12 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd0ac103c0
R13: 00007ff84ede0b5f R14: 00007ffd0ac104d0 R15: 0000000000000002
 </TASK>
---[ end trace ]---


Tested on:

commit:         58785836 Merge tag 'nfsd-7.3-1' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151c7df9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f
dashboard link: https://syzkaller.appspot.com/bug?extid=9e3014263a35700ab49b
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16c69901580000