syzbot

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BUG: KCSAN: data-race in mas_wmb_replace / mtree_range_walk

write to 0xffff888108ed3f00 of 8 bytes by task 5056 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:323 [inline]
 mas_put_in_tree lib/maple_tree.c:1726 [inline]
 mas_topiary_replace lib/maple_tree.c:2555 [inline]
 mas_wmb_replace+0x20f/0x14f0 lib/maple_tree.c:2646
 mas_split lib/maple_tree.c:3393 [inline]
 mas_commit_b_node lib/maple_tree.c:3446 [inline]
 mas_wr_bnode lib/maple_tree.c:4158 [inline]
 mas_wr_modify+0x183d/0x3c90 lib/maple_tree.c:4196
 mas_wr_store_entry+0x250/0x390 lib/maple_tree.c:4229
 mas_store_prealloc+0x151/0x2b0 lib/maple_tree.c:5485
 vma_iter_store mm/internal.h:1292 [inline]
 vma_complete+0x3a7/0x760 mm/mmap.c:535
 __split_vma+0x5db/0x610 mm/mmap.c:2385
 do_vmi_align_munmap+0x224/0x9c0 mm/mmap.c:2550
 do_vmi_munmap+0x1eb/0x230 mm/mmap.c:2696
 mmap_region+0x523/0x1550 mm/mmap.c:2747
 do_mmap+0x6a6/0xac0 mm/mmap.c:1385
 vm_mmap_pgoff+0x12f/0x250 mm/util.c:573
 ksys_mmap_pgoff+0x2bd/0x340 mm/mmap.c:1431
 x64_sys_call+0x1815/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888108ed3f00 of 8 bytes by task 5054 on cpu 1:
 ma_dead_node lib/maple_tree.c:560 [inline]
 mtree_range_walk+0x33d/0x460 lib/maple_tree.c:2793
 mas_state_walk lib/maple_tree.c:3678 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4909
 lock_vma_under_rcu+0x84/0x2a0 mm/memory.c:5758
 do_user_addr_fault arch/x86/mm/fault.c:1354 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x161/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff888103f34ac1 -> 0xffff888108ed3f00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5054 Comm: syz-executor.4 Not tainted 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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loop4: detected capacity change from 0 to 1532