syzbot

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BUG: KCSAN: data-race in mas_replace_node / mtree_range_walk

write to 0xffff888117075f00 of 8 bytes by task 15257 on cpu 1:
 mte_set_node_dead lib/maple_tree.c:337 [inline]
 mas_put_in_tree lib/maple_tree.c:1735 [inline]
 mas_replace_node+0x1b8/0x430 lib/maple_tree.c:1749
 mas_wr_node_store lib/maple_tree.c:3863 [inline]
 mas_wr_store_entry+0x1e80/0x2460 lib/maple_tree.c:4083
 mas_store_prealloc+0x6d5/0x960 lib/maple_tree.c:5475
 vma_iter_store_overwrite mm/vma.h:448 [inline]
 vma_iter_store_new+0x1d3/0x210 mm/vma.h:455
 vma_complete+0x12b/0x570 mm/vma.c:323
 __split_vma+0x56c/0x630 mm/vma.c:523
 split_vma mm/vma.c:553 [inline]
 vma_modify+0x105/0x200 mm/vma.c:1579
 vma_modify_flags+0x10a/0x140 mm/vma.c:1605
 mprotect_fixup+0x30f/0x5d0 mm/mprotect.c:658
 do_mprotect_pkey+0x6ce/0x9a0 mm/mprotect.c:832
 __do_sys_mprotect mm/mprotect.c:853 [inline]
 __se_sys_mprotect mm/mprotect.c:850 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:850
 x64_sys_call+0x272f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888117075f00 of 8 bytes by task 15259 on cpu 0:
 ma_dead_node lib/maple_tree.c:575 [inline]
 mtree_range_walk+0x347/0x460 lib/maple_tree.c:2788
 mas_state_walk lib/maple_tree.c:3605 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4905
 lock_vma_under_rcu+0xa7/0x340 mm/memory.c:6553
 do_user_addr_fault arch/x86/mm/fault.c:1328 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x150/0x6a0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff888117075a0e -> 0xffff888117075f00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15259 Comm: syz.6.4329 Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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