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Fri, 21 Jun 2024 06:29:25 -0700 (PDT) Date: Fri, 21 Jun 2024 06:29:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008d1e5a061b666b11@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in mtree_range_walk / rcu_segcblist_enqueue (2) From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lstoakes@gmail.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 52D87C000B X-Stat-Signature: w16akfx7tqrzf46ynaqpkjckbdt4eshc X-Rspam-User: X-HE-Tag: 1718976566-606798 X-HE-Meta: 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 cSqAu9LL 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 uTGG5HHO Y83crBQJDQsCkwba6TUuMxj5H0dbw/S1518I7a+cLm+88Jq+oPoXqCdY+xqkHgZ9Yv22hT99xhqFh7yiWFyPYMltogsvCbbsdFesFATYujRc9Fnhdh2Cuv2HUMmfjz+8v+Q+ZfZzS4NI7Fx5RWsLEoRSwTd1UyFLm6SEzg2+YQvY12cB23dMi+gefxD2jJAkT4xHTsyqzObWbxvl6jDP5haHQhSklA4CmkqTyYU+TChsIKvi60kge25a6xcqHpHy01LLsx7Ed1t9THxsXUNcPTkGWh2gpJJRgpEgHEU6OyI+2BbM0MHRDqCop2MIx+Y+0ztE8jHW4I/fcqIhbSN81AXAtPvnKRqRTm2jvOgcRzAMnGJ+MhCOdC8kRaK48fWV X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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@syzkaller.appspotmail.com ================================================================== 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@googlegroups.com. 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