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aucIWybMTXIjUxmznv2elyyoPrj6QCIxd4uJGeUij5Tdnj32OHTvJ9K0NbCsprISxL/RZSSjst6OPQXw/suMBC3J1wjmgA8G5LqGIQ0g7I6gg7Bnc/tEU1+SpIO7b5eNTMxhbjfL9X3TAwqhwNvALxU8YvtkVb8sPbi29VRnciqYeqY1PSm2mT13xFrIjz2gFC+RDt+YeGi46SrqiVvigl9OXNV3P1xCvkQXWC9Zx/eDqqOKqLx7q8L/4xrhOhXCRfSNLQTGp0wg7Wep/1BaDCgWdVMwhfGRwRFa9mQilMXlCSeBlhuWH0P2G+yLQ+pKWT37mUij8hw1cucz845RiFVv5HJQ7No2qFE7AAaMOYNvMjoB0Qg+Z06ChSwLC74TvTa8ksPDylmLzPBF+bgGYfNg6TkzbaqTWE35/IWp9hPEkIe6PJnKT7jOAlugjzEqotZ68YzaVWQ= 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: On Tue, Mar 25, 2025 at 04:15:24PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3ba7dfb8da62 Merge tag 'rcu-next-v6.15' of git://git.kerne.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14254198580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=79f1cf4142160c34 > dashboard link: https://syzkaller.appspot.com/bug?extid=93107467480b9f9ed726 > 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/dd40b872cca9/disk-3ba7dfb8.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/86a3a241fb7d/vmlinux-3ba7dfb8.xz > kernel image: https://storage.googleapis.com/syzbot-assets/1ce46917915c/bzImage-3ba7dfb8.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+93107467480b9f9ed726@syzkaller.appspotmail.com > > ================================================================== > BUG: KCSAN: data-race in try_to_migrate_one / vms_clear_ptes > This is another classic rmap lock vs. mmap/vma lock scenario, but it seems pretty benign. try_to_migrate_one() is under rmap lock, vms_clear_ptes() under mmap/vma. It's an unfortunate race, but we'd probably prefer not to slow down this code. We might want to tag it data_race() though? > write to 0xffff88810005d8f8 of 8 bytes by task 8860 on cpu 1: > update_hiwater_rss include/linux/mm.h:2675 [inline] This is: static inline void update_hiwater_rss(struct mm_struct *mm) { unsigned long _rss = get_mm_rss(mm); if ((mm)->hiwater_rss < _rss) (mm)->hiwater_rss = _rss; <---- here. } > vms_clear_ptes+0x1a2/0x300 mm/vma.c:1136 > vms_complete_munmap_vmas+0x17b/0x480 mm/vma.c:1186 > do_vmi_align_munmap+0x344/0x390 mm/vma.c:1445 > do_vmi_munmap+0x1eb/0x230 mm/vma.c:1493 > __vm_munmap+0x19a/0x280 mm/vma.c:2956 > __do_sys_munmap mm/mmap.c:1084 [inline] > __se_sys_munmap mm/mmap.c:1081 [inline] > __x64_sys_munmap+0x36/0x40 mm/mmap.c:1081 > x64_sys_call+0xe1b/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:12 > 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 0xffff88810005d8f8 of 8 bytes by task 8858 on cpu 0: > update_hiwater_rss include/linux/mm.h:2674 [inline] > try_to_migrate_one+0x775/0x12e0 mm/rmap.c:2183 > rmap_walk_anon+0x28f/0x440 mm/rmap.c:2646 > try_to_migrate+0x11f/0x150 > migrate_folio_unmap mm/migrate.c:1318 [inline] > migrate_pages_batch+0x786/0x1930 mm/migrate.c:1864 > migrate_pages_sync mm/migrate.c:1987 [inline] > migrate_pages+0xf02/0x1840 mm/migrate.c:2096 > do_mbind mm/mempolicy.c:1425 [inline] > kernel_mbind mm/mempolicy.c:1568 [inline] > __do_sys_mbind mm/mempolicy.c:1642 [inline] > __se_sys_mbind+0xfd1/0x11c0 mm/mempolicy.c:1638 > __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1638 > x64_sys_call+0x13be/0x2e10 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: 0x0000000000001f8f -> 0x000000000000262f > > Reported by Kernel Concurrency Sanitizer on: > CPU: 0 UID: 0 PID: 8858 Comm: syz.2.1483 Tainted: G W 6.14.0-syzkaller-00685-g3ba7dfb8da62 #0 > Tainted: [W]=WARN > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > ================================================================== > > > --- > 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