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Wed, 05 Feb 2025 03:41:20 -0800 (PST) Date: Wed, 05 Feb 2025 03:41:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67a34e60.050a0220.50516.0040.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in mprotect_fixup / try_to_migrate_one From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: F274D180010 X-Stat-Signature: o7bxqwutccx87skmp9pci7xoprny1x43 X-Rspam-User: X-HE-Tag: 1738755680-522622 X-HE-Meta: U2FsdGVkX198iXg6LQ+p3oewVYmSKDYeo1uAXFDaU2a0UXaAZ8RICQt6vRmyjzN7mOEX6oPQcI54gwq09iWew0vixaJx5Fl4+axWZNfHskwP1FXqbYZkdeT3UYkJT4k2v5sYP/sJWDx0SDtLw4o2QkQ/eUHcVnc47gSm/V2oY2LaaETj+3c1dVQ/hULoN+34ZZTGBYDLzz5caodTlIWtooE6Nto4G/rFdNKh99mD2sQRCKEImiL4fcSjTj1mq1ls569UQxbEAa8dXYdC6d8GzFtT4ua6F4Bq9WkXdCCEzlntROEQ5N5VAjZ6uTSCi1fdt9WBJ2KKvpw7hKAN0pHXXrL1Qwu7Z1t9vQWIlcaBcFppTI3DKKLCh1Pm9Gktp45/0wwcJI0pA059HdJNCVjKY9YEYbhzdYLRX5xAWtg4k7GOzJfOCdqyP2u9eLoRg4Io2bdSK305u6fmimbZpAUj1kXci2eDvvbeAaWiMDWs6vQXt9Ny0X/tFDbjrxnkdzojTnBnXBNRTnrSKSl6o6jxiC3LGH+DSWNJpNeHw3R0ad/mJZ4BKdSdOZAw+6BdFv80SghxaRcUx/70DukSyUPdKre7Mjn9PTMjDSMZtOAKlxZuVf2EktCfQIsD7SBKBeDzsk3yfil5TOE/+RjBmz+TAMV9kt4KQTe6MbkEzCwWPDuIoPj147XdVisaBy6PYqueoKOx6Kvp1pVMdPw9qTC02iPHI0j1GubNmIoDEI6hboUey6MhogoLQkd1Xx43A9oFYrviIWWUoJzYIYmG9/6plhDw9F7w+V+/soQPVd1NHJvOJ03qYG+ECAKbS1zzR/UpulvJSvlB2F6x6/r7cQUk01nTKgKZcoSxzbBwS/TGdsYPPqXNF1GKhehKuCDcTwTx5YRMC6P8qb0woZ0RRf7za2ql1ordyrU07QierL581F8XeZKqv5xlAQ0iUv/EWc5v4KE2J8YNY4p6O2nQ5Re Nd4bQgjb 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 y/wvNNPB konCZjdL3/ZUwxY98nl9UklHhyp/24hxlMrzRXE2RjhZ91knBEFprebA2BTpL8QEmM9cSj6mUIa+gzoVho7X9F6S6Cxz24Q3BChD4QbGZ98KbmimUT7A/F4sroukxARvz0NzCZkcVb468LVTXL307MqiLnvdeBW0S9a5dtKF2Rtw8p0z/i71E9OrAxnNaVmoMjTZLYUgyi+HCjDXE4NoRtRBCJ5c2TC3PwOPv9NNkQBX/9e3I6BaeK49FqvGPAoqf1jaM2pojQwa55MFblVZ1uis0LKyrVMiIDqLNYJEiwcHnMtsRX8f/DZ50zQeiORp2z16tMPM1zh8tRk5mpwkkycOS713HIR2W19LH/TRCWSusrAubd7MJ5X7kKsPvpHMqqdU4vowfjadydu/1DFDPd8kJnwekaq0iq0jIisCSSqDXfRGzyViIO1DGhQ88io1JYweppLCuldQ84GDjocNB6A0IMbvL+bCSJZsHZDv37ISRMxJU+ZwSA== 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: d009de7d5428 Merge tag 'livepatching-for-6.14-rc2' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b678a4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e757e3762bd630b dashboard link: https://syzkaller.appspot.com/bug?extid=c2e5712cbb14c95d4847 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/9235000a1b88/disk-d009de7d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/098ef82f8ab3/vmlinux-d009de7d.xz kernel image: https://storage.googleapis.com/syzbot-assets/4f51f5eb5782/bzImage-d009de7d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c2e5712cbb14c95d4847@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in mprotect_fixup / try_to_migrate_one write to 0xffff888114b41700 of 8 bytes by task 6432 on cpu 1: vm_flags_init include/linux/mm.h:875 [inline] vm_flags_reset include/linux/mm.h:887 [inline] mprotect_fixup+0x419/0x5e0 mm/mprotect.c:679 do_mprotect_pkey+0x6cc/0x9a0 mm/mprotect.c:840 __do_sys_mprotect mm/mprotect.c:861 [inline] __se_sys_mprotect mm/mprotect.c:858 [inline] __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:858 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 0xffff888114b41700 of 8 bytes by task 6418 on cpu 0: try_to_migrate_one+0xb5a/0x12e0 mm/rmap.c:2321 rmap_walk_anon+0x28f/0x440 mm/rmap.c:2646 try_to_migrate+0x11f/0x150 migrate_folio_unmap mm/migrate.c:1320 [inline] migrate_pages_batch+0x786/0x1930 mm/migrate.c:1866 migrate_pages_sync mm/migrate.c:1989 [inline] migrate_pages+0xf02/0x1840 mm/migrate.c:2098 do_mbind mm/mempolicy.c:1394 [inline] kernel_mbind mm/mempolicy.c:1537 [inline] __do_sys_mbind mm/mempolicy.c:1611 [inline] __se_sys_mbind+0xfd1/0x11c0 mm/mempolicy.c:1607 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1607 x64_sys_call+0x2662/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:238 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 value changed: 0x0000000000102077 -> 0x0000000000102071 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 6418 Comm: syz.0.1339 Not tainted 6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ================================================================== --- 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