Hello, syzbot found the following issue on: HEAD commit: 2f8c4f506285 Merge tag 'auxdisplay-for-v6.11-tag1' of git:.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=145d019d980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ea3a063e5f96c3d6 dashboard link: https://syzkaller.appspot.com/bug?extid=24ac24ff58dc5b0d26b9 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1629a655980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16bfb899980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ed9f828b1910/disk-2f8c4f50.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b8bdff998eb1/vmlinux-2f8c4f50.xz kernel image: https://storage.googleapis.com/syzbot-assets/41b7030717aa/bzImage-2f8c4f50.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/6b20d8f48921/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+24ac24ff58dc5b0d26b9@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 8 ===================================================== BUG: KMSAN: uninit-value in pick_link+0xd8c/0x1690 fs/namei.c:1850 pick_link+0xd8c/0x1690 fs/namei.c:1850 step_into+0x156f/0x1640 fs/namei.c:1909 open_last_lookups fs/namei.c:3674 [inline] path_openat+0x39da/0x6100 fs/namei.c:3883 do_filp_open+0x20e/0x590 fs/namei.c:3913 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1442 x64_sys_call+0x1fe/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4719 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2263 alloc_pages_noprof mm/mempolicy.c:2343 [inline] folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2350 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1008 do_read_cache_folio+0x12a/0xfd0 mm/filemap.c:3753 do_read_cache_page mm/filemap.c:3855 [inline] read_cache_page+0x63/0x1d0 mm/filemap.c:3864 read_mapping_page include/linux/pagemap.h:907 [inline] page_get_link+0x73/0xab0 fs/namei.c:5272 pick_link+0xd6c/0x1690 step_into+0x156f/0x1640 fs/namei.c:1909 open_last_lookups fs/namei.c:3674 [inline] path_openat+0x39da/0x6100 fs/namei.c:3883 do_filp_open+0x20e/0x590 fs/namei.c:3913 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1442 x64_sys_call+0x1fe/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5191 Comm: syz-executor190 Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 ===================================================== --- 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@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
