Re: [syzbot] [raid?] WARNING in create_strip_zones (2)

[syzbot <syzbot+a32ff75e417c0f49a8e9@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    bc35965f6940 Merge tag 'mm-hotfixes-stable-2026-09-03-17-4..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12271215580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f
dashboard link: https://syzkaller.appspot.com/bug?extid=a32ff75e417c0f49a8e9
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=173f2b49580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a32ff75e417c0f49a8e9@syzkaller.appspotmail.com

------------[ cut here ]------------
!(flags & __GFP_NOWARN)
WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x646/0x9b0 mm/slub.c:7013, CPU#3: syz-executor142/6020
Modules linked in:
CPU: 3 UID: 0 PID: 6020 Comm: syz-executor142 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:__kvmalloc_node_noprof+0x646/0x9b0 mm/slub.c:7013
Code: c1 e8 2e 07 ff ff 4d 85 f6 0f 85 b6 fd ff ff 48 81 fb ff ff ff 7f 0f 86 4d fd ff ff 41 81 e4 00 20 00 00 0f 85 9c fd ff ff 90 <0f> 0b 90 e9 93 fd ff ff 41 be 10 00 00 00 e9 88 fd ff ff be 42 01
RSP: 0018:ffffc900036bf948 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000200000000 RCX: 0000000200000000
RDX: 0000000000000000 RSI: ffffffff8c620f00 RDI: ffffffff8e6b6938
RBP: 00000000001fffff R08: 00000000000029c0 R09: 00000000ffffffff
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000029c0 R14: 0000000000000000 R15: 00000000ffffffff
FS:  0000555559921400(0000) GS:ffff8880d5e60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bcaf223cc0 CR3: 0000000055943000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 create_strip_zones+0x57f/0x1fa0 drivers/md/raid0.c:150
 raid0_run+0x341/0x410 drivers/md/raid0.c:424
 md_run+0xc2f/0x2510 drivers/md/md.c:6779
 do_md_run+0x36/0x660 drivers/md/md.c:6880
 md_ioctl+0x27eb/0x36d0 drivers/md/md.c:8515
 blkdev_ioctl+0x5ad/0x6f0 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 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: 0033:0x7f76d13e162b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffc9fbd7ba0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f76d13e162b
RDX: 0000000000000000 RSI: 00000000400c0930 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f76d143a032
R13: 0000000000000002 R14: 00007f76d1464cc0 R15: 0000000000000002
 </TASK>


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#syz test: git://repo/address.git branch-or-commit-hash
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