Message-ID: <689a2e53.050a0220.51d73.00a1.GAE@google.com>
Date: Mon, 11 Aug 2025 10:54:27 -0700
From: syzbot <syzbot+7f04e5b3fea8b6c33d39@...kaller.appspotmail.com>
To: asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [io-uring?] WARNING in vmap_small_pages_range_noflush

Hello,

syzbot found the following issue on:

HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10850ea2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5f2996d42fef6c09
dashboard link: https://syzkaller.appspot.com/bug?extid=7f04e5b3fea8b6c33d39
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10ec9042580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14850ea2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5166c0e1d4f0/disk-6e64f458.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d6654192cf8/vmlinux-6e64f458.xz
kernel image: https://storage.googleapis.com/syzbot-assets/239aaa681481/bzImage-6e64f458.xz

The issue was bisected to:

commit 087f997870a948820ec366701d178f402c6a23a3
Author: Pavel Begunkov <asml.silence@...il.com>
Date:   Fri Nov 29 13:34:32 2024 +0000

    io_uring/memmap: implement mmap for regions

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=157afea2580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=177afea2580000
console output: https://syzkaller.appspot.com/x/log.txt?x=137afea2580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7f04e5b3fea8b6c33d39@...kaller.appspotmail.com
Fixes: 087f997870a9 ("io_uring/memmap: implement mmap for regions")

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5851 at mm/vmalloc.c:542 vmap_pages_pte_range mm/vmalloc.c:542 [inline]
WARNING: CPU: 1 PID: 5851 at mm/vmalloc.c:542 vmap_pages_pmd_range mm/vmalloc.c:569 [inline]
WARNING: CPU: 1 PID: 5851 at mm/vmalloc.c:542 vmap_pages_pud_range mm/vmalloc.c:587 [inline]
WARNING: CPU: 1 PID: 5851 at mm/vmalloc.c:542 vmap_pages_p4d_range mm/vmalloc.c:605 [inline]
WARNING: CPU: 1 PID: 5851 at mm/vmalloc.c:542 vmap_small_pages_range_noflush+0x984/0xc90 mm/vmalloc.c:627
Modules linked in:
CPU: 1 UID: 0 PID: 5851 Comm: syz-executor194 Not tainted 6.16.0-syzkaller-11952-g6e64f4580381 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vmap_pages_pte_range mm/vmalloc.c:542 [inline]
RIP: 0010:vmap_pages_pmd_range mm/vmalloc.c:569 [inline]
RIP: 0010:vmap_pages_pud_range mm/vmalloc.c:587 [inline]
RIP: 0010:vmap_pages_p4d_range mm/vmalloc.c:605 [inline]
RIP: 0010:vmap_small_pages_range_noflush+0x984/0xc90 mm/vmalloc.c:627
Code: 4d 89 f4 4d 21 ec 4c 89 e7 e8 98 6c ab ff 4d 39 ec 75 68 e8 de 71 ab ff 4c 09 eb e9 c8 fd ff ff 4c 8b 34 24 e8 cd 71 ab ff 90 <0f> 0b 90 e9 fc fe ff ff e8 bf 71 ab ff 4c 89 e7 e8 07 00 f7 ff 31
RSP: 0018:ffffc90002ea7990 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea0003000000 RCX: ffffffff82101e9f
RDX: ffff888025be2440 RSI: ffffffff82102153 RDI: 0000000000000005
RBP: ffff8880505c4508 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 8000000000000163 R14: 1ffff920005d4f47 R15: ffffc900602a1000
FS:  000055557d51e380(0000) GS:ffff8881247c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dad0a404b0 CR3: 0000000071b22000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __vmap_pages_range_noflush mm/vmalloc.c:656 [inline]
 vmap_pages_range_noflush mm/vmalloc.c:681 [inline]
 vmap_pages_range mm/vmalloc.c:701 [inline]
 vmap+0x1aa/0x320 mm/vmalloc.c:3515
 io_region_init_ptr io_uring/memmap.c:125 [inline]
 io_create_region+0x605/0xd40 io_uring/memmap.c:228
 io_create_region_mmap_safe+0xb2/0x170 io_uring/memmap.c:245
 io_register_mem_region io_uring/register.c:616 [inline]
 __io_uring_register+0x59f/0x2440 io_uring/register.c:836
 __do_sys_io_uring_register io_uring/register.c:929 [inline]
 __se_sys_io_uring_register io_uring/register.c:906 [inline]
 __x64_sys_io_uring_register+0x169/0x280 io_uring/register.c:906
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9c19ee429
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffec21487c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 0000000000000045 RCX: 00007ff9c19ee429
RDX: 0000200000000200 RSI: 0000000000000022 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 00007ff9c1a66220
R10: 0000000000000001 R11: 0000000000000246 R12: 0000200000000300
R13: 0000200000000100 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
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