Hello, syzbot found the following issue on:
HEAD commit: 9b2ffa6148b1 Merge tag 'mtd/fixes-for-6.13-rc5' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=112374c4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9048090d7bb0d06 dashboard link: https://syzkaller.appspot.com/bug?extid=1379ee6b9a14d5dacaf2 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/244f25c1a275/disk-9b2ffa61.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0d14fc6634fd/vmlinux-9b2ffa61.xz kernel image: https://storage.googleapis.com/syzbot-assets/cb152a4c0fd2/bzImage-9b2ffa61.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1379ee6b9a14d5dac...@syzkaller.appspotmail.com exFAT-fs (loop7): failed to load upcase table (idx : 0x00010000, chksum : 0x1a9973fb, utbl_chksum : 0xe619d30d) ===================================================== BUG: KMSAN: uninit-value in erofs_read_superblock fs/erofs/super.c:274 [inline] BUG: KMSAN: uninit-value in erofs_fc_fill_super+0x66a/0x2520 fs/erofs/super.c:614 erofs_read_superblock fs/erofs/super.c:274 [inline] erofs_fc_fill_super+0x66a/0x2520 fs/erofs/super.c:614 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0x183/0x350 fs/super.c:1299 erofs_fc_get_tree+0x34d/0x450 fs/erofs/super.c:721 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507 path_mount+0x742/0x1f10 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x722/0x810 fs/namespace.c:4034 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 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+0x9a7/0xe00 mm/page_alloc.c:4776 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2269 alloc_pages_noprof mm/mempolicy.c:2348 [inline] folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2355 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1009 __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1951 block_write_begin+0x6e/0x2b0 fs/buffer.c:2221 exfat_write_begin+0xfb/0x400 fs/exfat/inode.c:434 exfat_extend_valid_size fs/exfat/file.c:553 [inline] exfat_file_write_iter+0x771/0x12a0 fs/exfat/file.c:598 do_iter_readv_writev+0x88a/0xa30 vfs_writev+0x56a/0x14f0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x262/0x460 fs/read_write.c:1195 __x64_sys_pwritev2+0x11f/0x1a0 fs/read_write.c:1195 x64_sys_call+0x368c/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:329 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: 1 UID: 0 PID: 8448 Comm: syz.7.643 Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- 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 syzkal...@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
