Hello, syzbot found the following issue on: HEAD commit: 88264981f208 Merge tag 'sched_ext-for-6.12' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1237ec27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6702f5f2b8ed242 dashboard link: https://syzkaller.appspot.com/bug?extid=e01fa33e67abb0b3b3bb 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/95bba355b2ed/disk-88264981.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/75966f4e5286/vmlinux-88264981.xz kernel image: https://storage.googleapis.com/syzbot-assets/7f1578876250/bzImage-88264981.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e01fa33e67abb0b3b3bb@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk write to 0xffff888114555710 of 8 bytes by task 9573 on cpu 1: mas_wr_slot_store lib/maple_tree.c:3889 [inline] mas_wr_store_entry+0x146b/0x2d00 lib/maple_tree.c:4075 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5520 vma_iter_store mm/vma.h:470 [inline] commit_merge+0x441/0x740 mm/vma.c:609 vma_expand+0x211/0x360 mm/vma.c:1024 vma_merge_new_range+0x2cf/0x3e0 mm/vma.c:963 mmap_region+0x887/0x16e0 mm/mmap.c:1416 do_mmap+0x718/0xb60 mm/mmap.c:496 vm_mmap_pgoff+0x133/0x290 mm/util.c:588 ksys_mmap_pgoff+0xd0/0x330 mm/mmap.c:542 x64_sys_call+0x1884/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:10 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 0xffff888114555710 of 8 bytes by task 9574 on cpu 0: mtree_range_walk+0x1b4/0x460 lib/maple_tree.c:2779 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:6224 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: 0x00007f8311576fff -> 0xffffffff8529a680 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 9574 Comm: syz.0.2084 Tainted: G W 6.11.0-syzkaller-08481-g88264981f208 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ================================================================== --- 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
