linux-kernel - [syzbot ci] Re: Extend xas_split* to support splitting arbitrarily large entries

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Message-ID: <691c3256.a70a0220.3124cb.00b6.GAE@google.com>
Date: Tue, 18 Nov 2025 00:46:14 -0800
From: syzbot ci <syzbot+ci3962cf5917af9819@...kaller.appspotmail.com>
To: ackerleytng@...gle.com, akpm@...ux-foundation.org, david@...hat.com, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, michael.roth@....com, vannapurve@...gle.com, 
	willy@...radead.org
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: Extend xas_split* to support splitting arbitrarily
 large entries

syzbot ci has tested the following series

[v1] Extend xas_split* to support splitting arbitrarily large entries
https://lore.kernel.org/all/20251117224701.1279139-1-ackerleytng@google.com
* [RFC PATCH 1/4] XArray: Initialize nodes while splitting instead of while allocating
* [RFC PATCH 2/4] XArray: Update xas_split_alloc() to allocate enough nodes to split large entries
* [RFC PATCH 3/4] XArray: Support splitting for arbitrarily large entries
* [RFC PATCH 4/4] XArray: test: Increase split order test range in check_split()

and found the following issue:
WARNING: kmalloc bug in bpf_prog_alloc_no_stats

Full report is available here:
https://ci.syzbot.org/series/aa74d39d-0773-4398-bb90-0a6d21365c3d

***

WARNING: kmalloc bug in bpf_prog_alloc_no_stats

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      41218ede767f6b218185af65ce919d0cade75f6b
arch:      amd64
compiler:  Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config:    https://ci.syzbot.org/builds/c26972f6-b81e-4d6f-bead-3d77003cf075/config

------------[ cut here ]------------
Unexpected gfp: 0x400000 (__GFP_ACCOUNT). Fixing up to gfp: 0xdc0 (GFP_KERNEL|__GFP_ZERO). Fix your code!
WARNING: CPU: 0 PID: 6465 at mm/vmalloc.c:3938 vmalloc_fix_flags+0x9c/0xe0
Modules linked in:
CPU: 0 UID: 0 PID: 6465 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:vmalloc_fix_flags+0x9c/0xe0
Code: 81 e6 1f 52 ee ff 89 74 24 30 81 e3 e0 ad 11 00 89 5c 24 20 90 48 c7 c7 c0 b9 76 8b 4c 89 fa 89 d9 4d 89 f0 e8 75 2b 6e ff 90 <0f> 0b 90 90 8b 44 24 20 48 c7 04 24 0e 36 e0 45 4b c7 04 2c 00 00
RSP: 0018:ffffc90005d7fb00 EFLAGS: 00010246
RAX: 6e85c22fb4362300 RBX: 0000000000000dc0 RCX: ffff888176898000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90005d7fb98 R08: ffff888121224293 R09: 1ffff11024244852
R10: dffffc0000000000 R11: ffffed1024244853 R12: 1ffff92000baff60
R13: dffffc0000000000 R14: ffffc90005d7fb20 R15: ffffc90005d7fb30
FS:  000055555be14500(0000) GS:ffff88818eb36000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f653e85c470 CR3: 00000001139ec000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __vmalloc_noprof+0xf2/0x120
 bpf_prog_alloc_no_stats+0x4a/0x4d0
 bpf_prog_alloc+0x3c/0x1a0
 bpf_prog_create_from_user+0xa7/0x440
 do_seccomp+0x7b1/0xd90
 __se_sys_prctl+0xc3c/0x1830
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f653e990b0d
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 18 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 9d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 1b 48 8b 54 24 18 64 48 2b 14 25 28 00 00 00
RSP: 002b:00007fffbd3687c0 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f653ea2cf80 RCX: 00007f653e990b0d
RDX: 00007fffbd368820 RSI: 0000000000000002 RDI: 0000000000000016
RBP: 00007fffbd368830 R08: 0000000000000006 R09: 0000000000000071
R10: 0000000000000071 R11: 0000000000000246 R12: 000000000000006d
R13: 00007fffbd368c58 R14: 00007fffbd368ed8 R15: 0000000000000000
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@...kaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.