[Android 6.1] kernel BUG in mas_store_prealloc

Hello,

syzbot found the following issue on:

HEAD commit: 6f4553626dbd ANDROID: GKI: gen_gki_modules_headers update ..
git tree: android14-6.1
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11369b62280000
kernel config: https://syzkaller.appspot.com/x/.config?x=69801444f67a0156
dashboard link: https://syzkaller.appspot.com/bug?extid=2f736716a2f39222a03a
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11261606280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1228e126280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8593dc5e480c/disk-6f455362.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fa16a31e1070/vmlinux-6f455362.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e740382200c5/bzImage-6f455362.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

------------[ cut here ]------------
kernel BUG at lib/maple_tree.c:5793!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 294 Comm: syz-executor448 Not tainted 6.1.25-syzkaller-00149-g6f4553626dbd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:mas_store_prealloc+0x3c0/0x420 lib/maple_tree.c:5793
Code: 48 89 df e8 82 f3 bd fc 48 8b 3b 48 c7 c6 73 0a 45 86 48 8b 54 24 10 31 c9 4c 8b 44 24 18 e8 97 8b ff ff eb 18 e8 30 91 78 fc <0f> 0b e8 c9 e4 08 00 e8 24 91 78 fc eb 34 e8 1d 91 78 fc 31 db 65
RSP: 0018:ffffc90000d17780 EFLAGS: 00010293
RAX: ffffffff84fb07a0 RBX: 0000000000000002 RCX: ffff88810e0e3900
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffffc90000d17890 R08: ffffffff84fb0643 R09: fffffbfff0d0d40b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff920001a2f43 R14: ffffffffffffffd2 R15: 1ffff920001a2ef4
FS: 0000555556c1d300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005f6b40 CR3: 0000000120a00000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vma_mas_store+0xe0/0x1e0 mm/mmap.c:434
__vma_adjust+0xf81/0x1870 mm/mmap.c:789
vma_merge+0x8ce/0x8f0
mlock_fixup+0x210/0x530 mm/mlock.c:420
apply_vma_lock_flags+0x327/0x480 mm/mlock.c:501
do_mlock+0x4fc/0x650 mm/mlock.c:602
__do_sys_mlock2 mm/mlock.c:629 [inline]
__se_sys_mlock2 mm/mlock.c:619 [inline]
__x64_sys_mlock2+0xb8/0xe0 mm/mlock.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7ed9c0b629
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdad0afec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000145
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f7ed9c0b629
RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000020bfd000
RBP: 00007ffdad0afed0 R08: 0000000000000001 R09: 00007f7ed9bc0033
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mas_store_prealloc+0x3c0/0x420 lib/maple_tree.c:5793
Code: 48 89 df e8 82 f3 bd fc 48 8b 3b 48 c7 c6 73 0a 45 86 48 8b 54 24 10 31 c9 4c 8b 44 24 18 e8 97 8b ff ff eb 18 e8 30 91 78 fc <0f> 0b e8 c9 e4 08 00 e8 24 91 78 fc eb 34 e8 1d 91 78 fc 31 db 65
RSP: 0018:ffffc90000d17780 EFLAGS: 00010293
RAX: ffffffff84fb07a0 RBX: 0000000000000002 RCX: ffff88810e0e3900
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffffc90000d17890 R08: ffffffff84fb0643 R09: fffffbfff0d0d40b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff920001a2f43 R14: ffffffffffffffd2 R15: 1ffff920001a2ef4
FS: 0000555556c1d300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005f6b40 CR3: 0000000120a00000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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syzbot has bisected this issue to:

commit 1c87a6f82a4e9bb8074a596c0acdc39ef9334473
Author: Liam R. Howlett <[email protected]>
Date: Tue Apr 11 15:10:55 2023 +0000

mm: enable maple tree RCU mode by default.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1108680e280000
start commit: 6f4553626dbd ANDROID: GKI: gen_gki_modules_headers update ..
git tree: android14-6.1
final oops: https://syzkaller.appspot.com/x/report.txt?x=1308680e280000
console output: https://syzkaller.appspot.com/x/log.txt?x=1508680e280000
Reported-by: [email protected]
Fixes: 1c87a6f82a4e ("mm: enable maple tree RCU mode by default.")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

syzbot suspects this issue was fixed by commit:

commit aede79b81ecd09d5f505f4b440b787c07f600a22
Author: Liam R. Howlett <[email protected]>
Date: Tue May 2 00:27:52 2023 +0000

ANDROID: mm: Fix __vma_adjust() writes for the maple tree

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16e33ffca80000
start commit: 6f4553626dbd ANDROID: GKI: gen_gki_modules_headers update ..
git tree: android14-6.1
If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: ANDROID: mm: Fix __vma_adjust() writes for the maple tree

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.