[moderation] [mm?] KCSAN: data-race in mas_wr_modify / mtree_range_walk

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 35f11a3710cd Merge tag 'mtd/for-6.8' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10673ccde80000
kernel config: https://syzkaller.appspot.com/x/.config?x=c92fce0e03e3e144
dashboard link: https://syzkaller.appspot.com/bug?extid=a68e0c19a271c2a0b063
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linu...@kvack.org]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c7a0c839db73/disk-35f11a37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ddb21ec98aea/vmlinux-35f11a37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c26f902a2ea8/bzImage-35f11a37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a68e0c...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in mas_wr_modify / mtree_range_walk

write to 0xffff888116586148 of 8 bytes by task 5731 on cpu 0:
mas_wr_slot_store lib/maple_tree.c:3992 [inline]
mas_wr_modify+0x1558/0x3c80 lib/maple_tree.c:4188
mas_wr_store_entry+0x250/0x390 lib/maple_tree.c:4231
mas_store_prealloc+0x151/0x2a0 lib/maple_tree.c:5437
vma_iter_store mm/internal.h:1185 [inline]
vma_expand+0x55c/0x5d0 mm/mmap.c:666
mmap_region+0x7db/0x1650 mm/mmap.c:2790
do_mmap+0x67e/0xa90 mm/mmap.c:1379
vm_mmap_pgoff+0x12e/0x240 mm/util.c:556
ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1425
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888116586148 of 8 bytes by task 5739 on cpu 1:
mtree_range_walk+0x1b4/0x450 lib/maple_tree.c:2784
mas_state_walk lib/maple_tree.c:3680 [inline]
mas_walk+0x16e/0x320 lib/maple_tree.c:4861
lock_vma_under_rcu+0x84/0x290 mm/memory.c:5602
do_user_addr_fault arch/x86/mm/fault.c:1356 [inline]
handle_page_fault arch/x86/mm/fault.c:1507 [inline]
exc_page_fault+0x164/0x6d0 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x00007f90b8439fff -> 0x00007f90b8418fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5739 Comm: syz-executor.2 Not tainted 6.7.0-syzkaller-01367-g35f11a3710cd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================


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