syzbot

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BUG: KCSAN: data-race in mas_state_walk / mas_wmb_replace

write to 0xffff88810414a500 of 8 bytes by task 15632 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:337 [inline]
 mas_topiary_node lib/maple_tree.c:2525 [inline]
 mas_topiary_replace lib/maple_tree.c:2634 [inline]
 mas_wmb_replace+0xe45/0x14a0 lib/maple_tree.c:2651
 mas_split lib/maple_tree.c:3390 [inline]
 mas_commit_b_node lib/maple_tree.c:3410 [inline]
 mas_wr_bnode lib/maple_tree.c:4079 [inline]
 mas_wr_store_entry+0x1773/0x2b50 lib/maple_tree.c:4111
 mas_store_prealloc+0x74d/0x9e0 lib/maple_tree.c:5510
 vma_iter_store_overwrite mm/vma.h:501 [inline]
 vma_iter_store_new+0x1c5/0x200 mm/vma.h:508
 vma_complete+0x125/0x580 mm/vma.c:354
 __split_vma+0x591/0x650 mm/vma.c:568
 split_vma mm/vma.c:598 [inline]
 vma_modify+0x21e/0xc80 mm/vma.c:1623
 vma_modify_flags+0x101/0x130 mm/vma.c:1649
 mprotect_fixup+0x2cc/0x570 mm/mprotect.c:816
 do_mprotect_pkey+0x6d6/0x980 mm/mprotect.c:990
 __do_sys_mprotect mm/mprotect.c:1011 [inline]
 __se_sys_mprotect mm/mprotect.c:1008 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:1008
 x64_sys_call+0x274e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810414a500 of 8 bytes by task 15634 on cpu 1:
 ma_dead_node lib/maple_tree.c:575 [inline]
 mtree_range_walk lib/maple_tree.c:2798 [inline]
 mas_state_walk+0x485/0x650 lib/maple_tree.c:3636
 mas_walk+0x60/0x150 lib/maple_tree.c:4939
 lock_vma_under_rcu+0x8d/0x160 mm/mmap_lock.c:143
 do_user_addr_fault+0x233/0x1090 arch/x86/mm/fault.c:1327
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff88813124b106 -> 0xffff88810414a500

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15634 Comm: syz.0.10934 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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