syzbot

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BUG: KCSAN: data-race in mas_replace_node / mtree_range_walk

write to 0xffff888104230e00 of 8 bytes by task 23510 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:323 [inline]
 mas_put_in_tree lib/maple_tree.c:1725 [inline]
 mas_replace_node+0x1b5/0x440 lib/maple_tree.c:1739
 mas_wr_node_store lib/maple_tree.c:3857 [inline]
 mas_wr_store_entry+0x1f75/0x2d00 lib/maple_tree.c:4078
 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5520
 vma_iter_store+0x168/0x190 mm/vma.h:470
 mmap_region+0x122f/0x16e0 mm/mmap.c:1513
 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 0xffff888104230e00 of 8 bytes by task 23509 on cpu 1:
 ma_dead_node lib/maple_tree.c:561 [inline]
 mtree_range_walk+0x33d/0x460 lib/maple_tree.c:2790
 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:6224
 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: 0xffff88810468010e -> 0xffff888104230e00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23509 Comm: syz.4.6537 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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