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Tue, 18 Feb 2025 01:11:19 -0800 (PST) Date: Tue, 18 Feb 2025 01:11:19 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67b44eb7.050a0220.173698.004a.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in try_to_migrate_one / zap_page_range_single From: syzbot To: akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 4A29014000A X-Rspamd-Server: rspam12 X-Stat-Signature: cph6hp4sat7k1csir4ih8i5yp5xx8kfg X-HE-Tag: 1739869880-76103 X-HE-Meta: U2FsdGVkX1/OsyrGVytbqc7bhd1auZLyk4sayPKqttpfjoUpDzmCl4kC7BLNJ1BMB0Y9t/x+kQ4SuLKKRy+fLWI0lRu0JoN25t/gikj3R/TU+4NgKqTDdmOwp6fDZnOK/kso5VNtRvRVIGntJlEIqIXb51Xkg2u7x86Xge2yfczly1mYjuhxFroiQ59jB+5ZkCIRACRf/WErYwJ0s8A6A69Mn8NZtuYEid+HEh3z6i44MvBaNXIAcSufd1dfjyvaObo5f2EMKM/h009XOdLjN4Va7aiV1Mo8WcGiCfp9BgsnhQbE05f7bj0zTzKBJRr9ziQVtCT81V64AaXhMPCCX3gCFWXEDCGJG0GION1sWyuXkHL/MWPZYRW2GZSwOY8hHr+WI80BGmi27R2FItLyn0hkshBm4vFnxkMrktQPE8wIsPOoAV+SSQpedJgSUIrP4izimtjCjrtiKcAFLpo+04uxocfxc/b0gXgT6OUXvWadZcDnE9FBefTntQ4ayQVqIhV3vMluSmD34hoWCyoEC34y1c5vEhDOtHhKt5r52Ykp8zUk1SwprdsyJ9c69IkU8JIO3vWhnzSH7SLwdeKyzkce5DyNsRZ2gTZtlSL6LqZwTF7ryzRWpHGmBNHjo2iYfYgCT/3fKSG/wk8zl14AKgYgMXAI0B8xfnAOsW4NZ2zfH85eFAObspNX0ehpPoekxBa45Y4DdEGLI0l0trmsqS7oexvSd+2gO1+lsWijsCKbustiF4THaRcTyaUTq1Neav91MlU70ZEi+kMT9VrF4zOl5EXWfg3lJrD4r3b8vzih2/UQ8ypwrJ5nWv0s/VTswxTYCJejhUzxLkm+k4vvQVgfkeQ7lvbTfC7RYXjBVpjbHSvCoBfcDhDDqcCjS6joZ7tRHXgr7RdABfH1xGWbox8r7RWdyNBTxCl/Of2pHAeF63AZq03U1e59JebBBPRMEj/cMJ1LSRJ4B7vIatP +LpBMLOg Av4oYG1GGNfjJH14jsdT+QIzHbpRCD8y/HnYUgaXkUYJji1IgRGy1UAF2GRMafTB47cBEvjP3Usjf14MacLm6HBWd0dDQEiqXvSgC7781Xcv1v9CACl+I9KhnCv1C9zF9WrqZsvvdBAqion/YmX+PH1bPFWP5T/Tj8BP9+j2Nge5/iK7+oiCC69NMjd6Fjc+Opf+pQ1yz6k6eKdcKMtbp1YPvRNNMyc4BXZ/roDghiEc8UyTml+5qu2fx9U/WGomDehpxM21404DY0jg++NF1GiWS3MPI8KKKWbmuo3vrUU38YIRjFsPrGC85gBg09mPF1z3XD8zfTnwMC1NR6uai3Z8Zm5pc1sEgPU/CJORNSZ2m6eCJu4pKNPUjI8pyXUSJyEscp4t/NBrJ8JNg79b42M4tuOIW13v0qJJfCsiEZurIIgjNioBR8jg7i4gS1fHg7T5tfXYO5raPnAo56+5irTrbP43CUQUiuRtPqrvelo1yOOFP6N79z5CRARzugVf8F34XgnER5ZB06dbcSE6lWVOn0jwrhj58VQUzTQozAgrNMyVNiHjTHwHs78IXK/ThZJk7P/A/0Xbgccg+Yreq4G+NaT0Rvh/4M32w9zH24aMHRztFxHR+jx5XAw5+/H1adh0IdSmhtN19Hdzch3bx2smWX2i3lIFQ1hxiihMfH+ouV3Fx5Ez4WKIGuilTJdOJyDqohgrXSU4l3hheohnqNen5Q7E8fgsga2abqRKHBJrFtu4HPUWBa7j3Jq6emUx0ENggmUzIJ9/yxUuVKKcvtHy1lb6vg079Nua7f0rJbR31ylAVRWD0MTzC0a8Pbf++c2+T5JtuSG5lAuf+tUaTlvKChLjuchS4PifKXynmsmLBm2fzP8Tyicsf2cLqrA3vGyWD7nnOJVMzMFJSvoqoMLZRauMxNodG2kMostylOZuYgZYokFUmjb4NNyQxkkf7uoiVuYSffAQ7xiukmlBd4pk5bGc9 wEJAnwAH icwq3ZeG0GparJFx85XKmuF3t5MuhufXcPHn/oyTs5MH771ZLJuFMwfjVOyW/Tk/plI9WzwWBvakka8UYv5032UclBW8+CIxODA8m/HFlDsJI8dR1FT3a7dvbZxSWRuI+G9JRxncDS97fEldfdi/eA7Ge6px+I8zRE1DUzXbypzp8Afzhazn1zdDSP6psy+u3ebTcxSgvxsEY/OYnv3iIm7fWEhidwpUl/EYOSTgHuH2IGBDKDnE3VDJNCCMAEIoNljgW4Di1tMz9CX3F6Ybd9yj1oB3u1QvvaK14KrSqIhVoY9WAOTadKNJ/ysEptlF/9vdokqraPpfp7gAkjL+dSE+OdONfOpTguJ1Q5nUZcu1gaudIfTOz+ZtNdHRzHZ0+IYcxfiOu+ke2rj586aiMiTqMdwmZbyw 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: 2408a807bfc3 Merge tag 'vfs-6.14-rc4.fixes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17481898580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ce4e433ac2a58cc2 dashboard link: https://syzkaller.appspot.com/bug?extid=419c4b42acc36c420ad3 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/2b5bc36288cc/disk-2408a807.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/75982289b311/vmlinux-2408a807.xz kernel image: https://storage.googleapis.com/syzbot-assets/c94f6df111e0/bzImage-2408a807.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+419c4b42acc36c420ad3@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in try_to_migrate_one / zap_page_range_single write to 0xffff88810005d8f8 of 8 bytes by task 8962 on cpu 1: update_hiwater_rss include/linux/mm.h:2669 [inline] zap_page_range_single+0x1a0/0x2f0 mm/memory.c:2012 unmap_mapping_range_vma mm/memory.c:3834 [inline] unmap_mapping_range_tree mm/memory.c:3851 [inline] unmap_mapping_pages mm/memory.c:3917 [inline] unmap_mapping_range+0x15c/0x1a0 mm/memory.c:3954 shmem_fallocate+0x278/0x860 mm/shmem.c:3672 vfs_fallocate+0x368/0x3b0 fs/open.c:338 madvise_remove mm/madvise.c:1025 [inline] madvise_vma_behavior mm/madvise.c:1260 [inline] madvise_walk_vmas mm/madvise.c:1502 [inline] do_madvise+0x14da/0x2ad0 mm/madvise.c:1689 __do_sys_madvise mm/madvise.c:1705 [inline] __se_sys_madvise mm/madvise.c:1703 [inline] __x64_sys_madvise+0x61/0x70 mm/madvise.c:1703 x64_sys_call+0x23ab/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:29 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 8928 on cpu 0: update_hiwater_rss include/linux/mm.h:2668 [inline] try_to_migrate_one+0x775/0x12e0 mm/rmap.c:2183 rmap_walk_file+0x272/0x3c0 mm/rmap.c:2708 try_to_migrate+0x108/0x150 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: 0x00000000000021af -> 0x00000000000021b9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 8928 Comm: syz.4.2451 Not tainted 6.14.0-rc3-syzkaller-00012-g2408a807bfc3 #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