Re: [syzbot] [mm?] kernel BUG in __vma_reservation_common

[syzbot <syzbot+d3fe2dc5ffe9380b714b@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    66ad4829ddd0 Merge tag 'net-6.10-rc1' of git://git.kernel...
git tree:       net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15c114aa980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48c05addbb27f3b0
dashboard link: https://syzkaller.appspot.com/bug?extid=d3fe2dc5ffe9380b714b
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17770d72980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10db1592980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/05c6f2231ef8/disk-66ad4829.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5f4fc63b22e3/vmlinux-66ad4829.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67f5c4c88729/bzImage-66ad4829.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d3fe2dc5ffe9380b714b@syzkaller.appspotmail.com

RBP: 0000000000000001 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000028031 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 00007f64830b0035 R15: 0000000000000001
 </TASK>
------------[ cut here ]------------
kernel BUG at mm/hugetlb.c:813!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 5089 Comm: syz-executor179 Not tainted 6.9.0-syzkaller-12071-g66ad4829ddd0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:region_abort mm/hugetlb.c:813 [inline]
RIP: 0010:__vma_reservation_common+0x795/0x7d0 mm/hugetlb.c:2835
Code: 21 65 8e 09 e8 8c a3 9e ff 90 0f 0b e8 84 a3 9e ff 90 0f 0b e8 7c a3 9e ff 90 0f 0b e8 74 a3 9e ff 90 0f 0b e8 6c a3 9e ff 90 <0f> 0b e8 64 a3 9e ff 90 0f 0b e8 5c a3 9e ff 90 0f 0b e8 54 a3 9e
RSP: 0018:ffffc900035ff1c0 EFLAGS: 00010293
RAX: ffffffff81f77114 RBX: 0000000000000000 RCX: ffff88801ff90000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900035ff290 R08: ffffffff81f76c26 R09: fffff520006bfe28
R10: dffffc0000000000 R11: fffff520006bfe28 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802ce84c08 R15: ffff88802ce84c00
FS:  00005555950a7380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6483099c40 CR3: 00000000746f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vma_add_reservation mm/hugetlb.c:2898 [inline]
 __unmap_hugepage_range+0x125d/0x2350 mm/hugetlb.c:5772
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1891
 unmap_region+0x1ec/0x350 mm/mmap.c:2355
 do_vmi_align_munmap+0x1122/0x18c0 mm/mmap.c:2673
 do_vmi_munmap+0x24e/0x2d0 mm/mmap.c:2741
 mmap_region+0x72f/0x2070 mm/mmap.c:2792
 do_mmap+0x8ad/0xfa0 mm/mmap.c:1387
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6483066d39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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:00007fff7dc97c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fff7dc97c80 RCX: 00007f6483066d39
RDX: 0000000000000000 RSI: 00000000001fffff RDI: 0000000020000000
RBP: 0000000000000001 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000028031 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 00007f64830b0035 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:region_abort mm/hugetlb.c:813 [inline]
RIP: 0010:__vma_reservation_common+0x795/0x7d0 mm/hugetlb.c:2835
Code: 21 65 8e 09 e8 8c a3 9e ff 90 0f 0b e8 84 a3 9e ff 90 0f 0b e8 7c a3 9e ff 90 0f 0b e8 74 a3 9e ff 90 0f 0b e8 6c a3 9e ff 90 <0f> 0b e8 64 a3 9e ff 90 0f 0b e8 5c a3 9e ff 90 0f 0b e8 54 a3 9e
RSP: 0018:ffffc900035ff1c0 EFLAGS: 00010293
RAX: ffffffff81f77114 RBX: 0000000000000000 RCX: ffff88801ff90000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900035ff290 R08: ffffffff81f76c26 R09: fffff520006bfe28
R10: dffffc0000000000 R11: fffff520006bfe28 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802ce84c08 R15: ffff88802ce84c00
FS:  00005555950a7380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6483099c40 CR3: 00000000746f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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