Hello, syzbot found the following issue on: HEAD commit: 50736169ecc8 Merge tag 'for-6.10-rc4-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=164ec02a980000 kernel config: https://syzkaller.appspot.com/x/.config?x=704451bc2941bcb0 dashboard link: https://syzkaller.appspot.com/bug?extid=9bb7d0f2fdb4229b9d67 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e4cbed12fec1/disk-50736169.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d50b5dcae4cd/vmlinux-50736169.xz kernel image: https://storage.googleapis.com/syzbot-assets/f2c14c5fcce2/bzImage-50736169.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9bb7d0f2fdb4229b9d67@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in mtree_range_walk / rcu_segcblist_enqueue write to 0xffff888104077308 of 8 bytes by task 12265 on cpu 1: rcu_segcblist_enqueue+0x67/0xb0 kernel/rcu/rcu_segcblist.c:345 rcutree_enqueue kernel/rcu/tree.c:2940 [inline] call_rcu_core kernel/rcu/tree.c:2957 [inline] __call_rcu_common kernel/rcu/tree.c:3093 [inline] call_rcu+0x1bd/0x430 kernel/rcu/tree.c:3176 ma_free_rcu lib/maple_tree.c:197 [inline] mas_free lib/maple_tree.c:1304 [inline] mas_replace_node+0x2f8/0x440 lib/maple_tree.c:1741 mas_wr_node_store lib/maple_tree.c:3956 [inline] mas_wr_modify+0x2bc3/0x3c90 lib/maple_tree.c:4189 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:1398 [inline] vma_complete+0x3a7/0x760 mm/mmap.c:535 __split_vma+0x623/0x690 mm/mmap.c:2440 split_vma mm/mmap.c:2466 [inline] vma_modify+0x198/0x1f0 mm/mmap.c:2507 vma_modify_flags include/linux/mm.h:3347 [inline] mprotect_fixup+0x335/0x610 mm/mprotect.c:637 do_mprotect_pkey+0x673/0x9a0 mm/mprotect.c:820 __do_sys_mprotect mm/mprotect.c:841 [inline] __se_sys_mprotect mm/mprotect.c:838 [inline] __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:838 x64_sys_call+0x26f5/0x2d70 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 0xffff888104077308 of 8 bytes by task 12266 on cpu 0: mtree_range_walk+0x140/0x460 lib/maple_tree.c:2774 mas_state_walk lib/maple_tree.c:3678 [inline] mas_walk+0x16e/0x320 lib/maple_tree.c:4909 lock_vma_under_rcu+0x84/0x260 mm/memory.c:5840 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12266 Comm: syz-executor.3 Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
