syzbot

BUG: KCSAN: data-race in call_rcu / mtree_range_walk

write to 0xffff888118a7dc08 of 8 bytes by task 6027 on cpu 0:
 __call_rcu_common kernel/rcu/tree.c:3085 [inline]
 call_rcu+0x47/0x430 kernel/rcu/tree.c:3190
 ma_free_rcu lib/maple_tree.c:197 [inline]
 mas_topiary_node lib/maple_tree.c:2523 [inline]
 mas_topiary_replace lib/maple_tree.c:2623 [inline]
 mas_wmb_replace+0xcb3/0x14d0 lib/maple_tree.c:2645
 mas_split lib/maple_tree.c:3375 [inline]
 mas_commit_b_node lib/maple_tree.c:3395 [inline]
 mas_wr_bnode lib/maple_tree.c:4044 [inline]
 mas_wr_store_entry+0x163c/0x2d00 lib/maple_tree.c:4085
 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5520
 vma_iter_store mm/vma.h:476 [inline]
 vma_complete+0x3a7/0x760 mm/vma.c:226
 __split_vma+0x620/0x6a0 mm/vma.c:429
 split_vma mm/vma.c:459 [inline]
 vma_modify+0x2cb/0xcd0 mm/vma.c:1437
 vma_modify_flags+0xf1/0x120 mm/vma.c:1455
 mprotect_fixup+0x31a/0x5e0 mm/mprotect.c:664
 do_mprotect_pkey+0x653/0x960 mm/mprotect.c:838
 __do_sys_mprotect mm/mprotect.c:859 [inline]
 __se_sys_mprotect mm/mprotect.c:856 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:856
 x64_sys_call+0x2770/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888118a7dc08 of 8 bytes by task 6026 on cpu 1:
 mtree_range_walk+0x140/0x460 lib/maple_tree.c:2773
 mas_state_walk lib/maple_tree.c:3601 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4948
 lock_vma_under_rcu+0x95/0x260 mm/memory.c:6239
 do_user_addr_fault arch/x86/mm/fault.c:1329 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x150/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007fa29ce55fff -> 0xffff888118a7d008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6026 Comm: syz.0.940 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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