On Fri, 24 Jan 2025 18:34:23 -0800 > Hello, > > syzbot found the following issue on: > > HEAD commit: ffd294d346d1 Linux 6.13 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1505b9df980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fdfc8dd0ccb1401a > dashboard link: https://syzkaller.appspot.com/bug?extid=069bb8b6fd64a600ab7b > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=163fd2b0580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/4d78aa6f8378/disk-ffd294d3.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/bdc1d0e9ca62/vmlinux-ffd294d3.xz > kernel image: https://storage.googleapis.com/syzbot-assets/80447d1feefe/bzImage-ffd294d3.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+069bb8b6fd64a600ab7b@xxxxxxxxxxxxxxxxxxxxxxxxx > > faultin_page mm/gup.c:1196 [inline] > __get_user_pages+0x8d9/0x3b50 mm/gup.c:1494 > populate_vma_page_range+0x27f/0x3a0 mm/gup.c:1932 > __mm_populate+0x1d6/0x380 mm/gup.c:2035 > mm_populate include/linux/mm.h:3397 [inline] > vm_mmap_pgoff+0x293/0x360 mm/util.c:580 > ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:546 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 6789 at ./include/linux/mm.h:1228 folio_large_mapcount include/linux/mm.h:1228 [inline] > WARNING: CPU: 0 PID: 6789 at ./include/linux/mm.h:1228 folio_mapcount include/linux/mm.h:1262 [inline] > WARNING: CPU: 0 PID: 6789 at ./include/linux/mm.h:1228 folio_mapped include/linux/mm.h:1273 [inline] > WARNING: CPU: 0 PID: 6789 at ./include/linux/mm.h:1228 page_mapped include/linux/mm.h:1283 [inline] > WARNING: CPU: 0 PID: 6789 at ./include/linux/mm.h:1228 stable_page_flags+0xab5/0xbc0 fs/proc/page.c:132 > Modules linked in: > CPU: 0 UID: 0 PID: 6789 Comm: syz.1.263 Not tainted 6.13.0-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 > RIP: 0010:folio_large_mapcount include/linux/mm.h:1228 [inline] > RIP: 0010:folio_mapcount include/linux/mm.h:1262 [inline] > RIP: 0010:folio_mapped include/linux/mm.h:1273 [inline] > RIP: 0010:page_mapped include/linux/mm.h:1283 [inline] > RIP: 0010:stable_page_flags+0xab5/0xbc0 fs/proc/page.c:132 > Code: f7 ff ff e8 fd 67 61 ff 4c 8b 3c 24 49 83 ef 01 e9 c9 fc ff ff e8 eb 67 61 ff 48 c7 c6 40 0c 62 8b 4c 89 ef e8 ec 28 a8 ff 90 <0f> 0b 90 e9 69 ff ff ff 4c 89 f7 e8 eb d8 c3 ff e9 21 fd ff ff 4c > RSP: 0018:ffffc9000bfbfc60 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 00fff00000000240 RCX: 0000000000000000 > RDX: ffff8880262b3c00 RSI: ffffffff8237e5a4 RDI: ffff8880262b4044 > RBP: ffffea0000cffe40 R08: 0000000000000001 R09: fffffbfff2d37baf > R10: ffffffff969bdd7f R11: 0000000000000004 R12: ffffea0000cffe00 > R13: ffffea0000cffe00 R14: 0000000000000000 R15: 0000000000000000 > FS: 00007fd7774456c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000c0076a2000 CR3: 0000000028ade000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > kpageflags_read+0x145/0x230 fs/proc/page.c:248 This read method is ill designed because querying mapcount for a buddy page makes no sense. > pde_read fs/proc/inode.c:308 [inline] > proc_reg_read+0x11d/0x330 fs/proc/inode.c:318 > vfs_read+0x1df/0xbe0 fs/read_write.c:563 > ksys_read+0x12b/0x250 fs/read_write.c:708 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fd776585d29 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fd777445038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > RAX: ffffffffffffffda RBX: 00007fd776776080 RCX: 00007fd776585d29 > RDX: 0000000000400000 RSI: 0000000000000000 RDI: 0000000000000003 > RBP: 00007fd776601b08 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 00007fd776776080 R15: 00007fff7853bb08 > </TASK> > > > --- > 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@xxxxxxxxxxxxxxxx. > > 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
