syzbot

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BUG: KCSAN: data-race in mas_walk / mas_wmb_replace

write to 0xffff888104b17100 of 8 bytes by task 4541 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:337 [inline]
 mas_put_in_tree lib/maple_tree.c:1735 [inline]
 mas_topiary_replace lib/maple_tree.c:2550 [inline]
 mas_wmb_replace+0x224/0x1510 lib/maple_tree.c:2641
 mas_split lib/maple_tree.c:3368 [inline]
 mas_commit_b_node lib/maple_tree.c:3388 [inline]
 mas_wr_bnode lib/maple_tree.c:4049 [inline]
 mas_wr_store_entry+0x158c/0x2460 lib/maple_tree.c:4090
 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+0x5b6/0x630 mm/vma.c:523
 split_vma mm/vma.c:553 [inline]
 vma_modify+0x1a2/0x200 mm/vma.c:1587
 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 0xffff888104b17100 of 8 bytes by task 4547 on cpu 1:
 ma_dead_node lib/maple_tree.c:575 [inline]
 mte_dead_node lib/maple_tree.c:590 [inline]
 mas_start lib/maple_tree.c:1378 [inline]
 mas_state_walk lib/maple_tree.c:3598 [inline]
 mas_walk+0x123/0x320 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: 0xffff88810484ac41 -> 0xffff888104b17100

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4547 Comm: syz.0.318 Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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