syzbot

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BUG: KCSAN: data-race in mas_replace_node / mas_state_walk

write to 0xffff88810472a800 of 8 bytes by task 495 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+0x1c9/0x440 lib/maple_tree.c:1749
 mas_wr_node_store lib/maple_tree.c:3863 [inline]
 mas_wr_store_entry+0x2425/0x2b60 lib/maple_tree.c:4083
 mas_store_prealloc+0x74d/0x9e0 lib/maple_tree.c:5475
 vma_iter_store_overwrite mm/vma.h:448 [inline]
 vma_iter_store_new+0x1c5/0x200 mm/vma.h:455
 vma_complete+0x125/0x570 mm/vma.c:323
 __split_vma+0x54c/0x610 mm/vma.c:523
 split_vma mm/vma.c:553 [inline]
 vma_modify+0x107/0x210 mm/vma.c:1579
 vma_modify_flags+0x101/0x130 mm/vma.c:1605
 mprotect_fixup+0x2cc/0x570 mm/mprotect.c:658
 do_mprotect_pkey+0x6d6/0x980 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+0x2794/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810472a800 of 8 bytes by task 500 on cpu 0:
 ma_dead_node lib/maple_tree.c:575 [inline]
 mtree_range_walk lib/maple_tree.c:2788 [inline]
 mas_state_walk+0x485/0x650 lib/maple_tree.c:3605
 mas_walk+0x30/0x120 lib/maple_tree.c:4905
 lock_vma_under_rcu+0xa2/0x2f0 mm/memory.c:6553
 do_user_addr_fault+0x233/0x1090 arch/x86/mm/fault.c:1328
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff88810346e206 -> 0xffff88810472a800

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 500 Comm: syz.2.9002 Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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