syzbot

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BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk

write to 0xffff88811570e310 of 8 bytes by task 3533 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3889 [inline]
 mas_wr_store_entry+0x146b/0x2d00 lib/maple_tree.c:4075
 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5520
 vma_iter_store mm/vma.h:476 [inline]
 commit_merge+0x441/0x740 mm/vma.c:608
 vma_expand+0x211/0x360 mm/vma.c:1030
 vma_merge_new_range+0x364/0x480 mm/vma.c:967
 __mmap_region mm/mmap.c:1427 [inline]
 mmap_region+0x95d/0x14a0 mm/mmap.c:1603
 do_mmap+0x718/0xb60 mm/mmap.c:496
 vm_mmap_pgoff+0x133/0x290 mm/util.c:588
 ksys_mmap_pgoff+0xd0/0x330 mm/mmap.c:542
 x64_sys_call+0x1884/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811570e310 of 8 bytes by task 3536 on cpu 1:
 mtree_range_walk+0x1b4/0x460 lib/maple_tree.c:2781
 mas_state_walk lib/maple_tree.c:3601 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4948
 lock_vma_under_rcu+0x95/0x260 mm/memory.c:6239
 do_user_addr_fault arch/x86/mm/fault.c:1329 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x150/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007f131973efff -> 0xffffffff852ab690

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3536 Comm: syz.0.21 Not tainted 6.12.0-rc7-syzkaller-00192-gb5a24181e461 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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