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Sat, 24 Jan 2026 18:23:28 -0800 (PST) Date: Sat, 24 Jan 2026 18:23:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69757ea0.a00a0220.33ccc7.0017.GAE@google.com> Subject: [syzbot] [mm?] kernel BUG in hpage_collapse_scan_file (2) From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, lance.yang@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 3du6pcafwk85dayzuiu5tuzaaosrh16k X-Rspamd-Queue-Id: 03C8D40008 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1769307809-265393 X-HE-Meta: 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 NMONoDb5 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 wlwuIH1M z6NnXU4LMDNyUAE2ONg9rw5ULxj+krnXeKcXSsCsOynee9V2GQ1qRaepmnuA2UXPjJ/CmSEKybmzP7KfbZ23y1DAUe/dJO/DzMDXMSASs9tzGn0g0zEt/z7qxIdnzkRtdQFi1nysOvcDALwnxkzU9+7WsY6B+nPtaUcL5Ada190d81duCQcekStYR1l5qz5qlvIMGv6m/zHRqid6xhIOC9SDNsTfmTuUApDHYOpYTBXBxSVXAmfOdIuzuMD4YfOAEOvFJoW6gkkf5+asL7DqNc0Kz1xU3ORivqwgllhx8R48nLPxm7/xj700qtXqm5et+M06wj8YRWuGKKGq6q2vJSWyCrA0IWk2ohYD7QZAXLaYGDnxY+pBDYRXQC0i1A8dJIMZXfRQGus2kdq1Pc/uIpqfDdgwICm9S2bdKjjtpezEhiZxiPMNlfQmw1HztBiYXtK9iJYDo7SVdwScLT2hAyT1bq+EhJFD 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: ca3a02fda4da Add linux-next specific files for 20260123 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10c42452580000 kernel config: https://syzkaller.appspot.com/x/.config?x=10f2b64f8f12b9a4 dashboard link: https://syzkaller.appspot.com/bug?extid=bf6e6a6ca143afea5ca2 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f7cbfa580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112d405a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/291ebca63a31/disk-ca3a02fd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b2112a214b54/vmlinux-ca3a02fd.xz kernel image: https://storage.googleapis.com/syzbot-assets/77d1ae437e07/bzImage-ca3a02fd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bf6e6a6ca143afea5ca2@syzkaller.appspotmail.com node ffff888148816ec0 offset 0 parent ffff888148817700 shift 0 count 64 values 0 array ffff88807be6b0f0 list ffff888148816ed8 ffff888148816ed8 marks 0 0 0 ------------[ cut here ]------------ kernel BUG at ./include/linux/xarray.h:1441! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6017 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:XAS_INVALID include/linux/xarray.h:1441 [inline] RIP: 0010:collapse_file mm/khugepaged.c:2041 [inline] RIP: 0010:hpage_collapse_scan_file+0x4e0c/0x50e0 mm/khugepaged.c:2387 Code: ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 ee 6c f6 fe 90 0f 0b 48 85 db 0f 84 29 01 00 00 e8 bd 34 91 ff 48 89 df e8 f5 c4 4b 09 90 <0f> 0b e8 ad 34 91 ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 be 6c f6 fe RSP: 0018:ffffc9000422f120 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888148816ec0 RCX: 6c90c8cc739bf400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000422f428 R08: ffffc9000422eea7 R09: 1ffff92000845dd4 R10: dffffc0000000000 R11: fffff52000845dd5 R12: 00000003fffffffc R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555592982500(0000) GS:ffff8881256ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 0000000031994000 CR4: 00000000003526f0 Call Trace: madvise_collapse+0x42f/0xb30 mm/khugepaged.c:2817 madvise_vma_behavior+0x10ad/0x43f0 mm/madvise.c:1372 madvise_walk_vmas+0x57a/0xaf0 mm/madvise.c:1721 madvise_do_behavior+0x386/0x540 mm/madvise.c:1937 do_madvise+0x1fa/0x2e0 mm/madvise.c:2030 __do_sys_madvise mm/madvise.c:2039 [inline] __se_sys_madvise mm/madvise.c:2037 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2037 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f948ad9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd1ef477c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f948b015fa0 RCX: 00007f948ad9acb9 RDX: 0000000000000019 RSI: 0000000000600003 RDI: 0000200000000000 RBP: 00007f948ae08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f948b015fac R14: 00007f948b015fa0 R15: 00007f948b015fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:XAS_INVALID include/linux/xarray.h:1441 [inline] RIP: 0010:collapse_file mm/khugepaged.c:2041 [inline] RIP: 0010:hpage_collapse_scan_file+0x4e0c/0x50e0 mm/khugepaged.c:2387 Code: ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 ee 6c f6 fe 90 0f 0b 48 85 db 0f 84 29 01 00 00 e8 bd 34 91 ff 48 89 df e8 f5 c4 4b 09 90 <0f> 0b e8 ad 34 91 ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 be 6c f6 fe RSP: 0018:ffffc9000422f120 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888148816ec0 RCX: 6c90c8cc739bf400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000422f428 R08: ffffc9000422eea7 R09: 1ffff92000845dd4 R10: dffffc0000000000 R11: fffff52000845dd5 R12: 00000003fffffffc R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555592982500(0000) GS:ffff8881256ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0001002a0 CR3: 0000000031994000 CR4: 00000000003526f0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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