================================================================== BUG: KCSAN: data-race in call_rcu / mas_state_walk write to 0xffff888106b62608 of 8 bytes by task 16080 on cpu 0: __call_rcu_common kernel/rcu/tree.c:3093 [inline] call_rcu+0x51/0x3f0 kernel/rcu/tree.c:3214 ma_free_rcu lib/maple_tree.c:211 [inline] mas_topiary_node lib/maple_tree.c:2521 [inline] mas_topiary_replace lib/maple_tree.c:2622 [inline] mas_wmb_replace+0xc6a/0x14a0 lib/maple_tree.c:2645 mas_split lib/maple_tree.c:3384 [inline] mas_commit_b_node lib/maple_tree.c:3404 [inline] mas_wr_bnode lib/maple_tree.c:4073 [inline] mas_wr_store_entry+0x1773/0x2b50 lib/maple_tree.c:4105 mas_store_prealloc+0x74d/0x9e0 lib/maple_tree.c:5507 vma_iter_store_overwrite mm/vma.h:502 [inline] vma_iter_store_new+0x1c5/0x200 mm/vma.h:509 vma_complete+0x125/0x580 mm/vma.c:351 __split_vma+0x591/0x650 mm/vma.c:565 split_vma mm/vma.c:595 [inline] vma_modify+0x21e/0xc80 mm/vma.c:1618 vma_modify_flags+0x101/0x130 mm/vma.c:1644 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+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888106b62608 of 8 bytes by task 16082 on cpu 1: mtree_range_walk lib/maple_tree.c:2788 [inline] mas_state_walk+0x3e9/0x650 lib/maple_tree.c:3630 mas_walk+0x30/0x120 lib/maple_tree.c:4936 lock_vma_under_rcu+0xa2/0x2f0 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: 0x000055556a23dfff -> 0xffff888106b62308 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 16082 Comm: syz.2.4680 Not tainted 6.16.0-rc5-syzkaller-00266-g3f31a806a62e #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================