Hello, syzbot found the following issue on: HEAD commit: 9f8413c4a66f Merge tag 'cgroup-for-6.8' of git://git.kerne.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13d26b1fe80000 kernel config: https://syzkaller.appspot.com/x/.config?x=656820e61b758b15 dashboard link: https://syzkaller.appspot.com/bug?extid=88ad8b0517a9d3bb9dc8 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=11377218180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111fd038180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/79d9f2f4b065/disk-9f8413c4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cbc68430d9c6/vmlinux-9f8413c4.xz kernel image: https://storage.googleapis.com/syzbot-assets/9740ad9fc172/bzImage-9f8413c4.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2f79f30d7608/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+88ad8b0517a9d3bb9dc8@xxxxxxxxxxxxxxxxxxxxxxxxx erofs: (device loop0): z_erofs_lz4_decompress_mem: failed to decompress -42 in[46, 0] out[9000] ===================================================== BUG: KMSAN: uninit-value in hex_dump_to_buffer+0xae9/0x10f0 lib/hexdump.c:194 hex_dump_to_buffer+0xae9/0x10f0 lib/hexdump.c:194 print_hex_dump+0x13d/0x3e0 lib/hexdump.c:276 z_erofs_lz4_decompress_mem fs/erofs/decompressor.c:252 [inline] z_erofs_lz4_decompress+0x257e/0x2a70 fs/erofs/decompressor.c:311 z_erofs_decompress_pcluster fs/erofs/zdata.c:1290 [inline] z_erofs_decompress_queue+0x338c/0x6460 fs/erofs/zdata.c:1372 z_erofs_decompressqueue_work+0x57/0x70 fs/erofs/zdata.c:1387 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2706 worker_thread+0xf45/0x1490 kernel/workqueue.c:2787 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Uninit was created at: __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591 alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133 alloc_pages mm/mempolicy.c:2204 [inline] folio_alloc+0x1da/0x380 mm/mempolicy.c:2211 filemap_alloc_folio+0xa5/0x430 mm/filemap.c:974 page_cache_ra_unbounded+0x2cc/0x960 mm/readahead.c:247 do_page_cache_ra mm/readahead.c:299 [inline] page_cache_ra_order+0xfeb/0x10a0 mm/readahead.c:546 ondemand_readahead+0x132b/0x1710 mm/readahead.c:668 page_cache_sync_ra+0x724/0x760 mm/readahead.c:695 page_cache_sync_readahead include/linux/pagemap.h:1283 [inline] filemap_get_pages+0x4c7/0x2c90 mm/filemap.c:2497 filemap_read+0x59e/0x14d0 mm/filemap.c:2593 generic_file_read_iter+0x136/0xad0 mm/filemap.c:2781 __kernel_read+0x3bb/0x9e0 fs/read_write.c:434 integrity_kernel_read+0x77/0x90 security/integrity/iint.c:221 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x1743/0x3cc0 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290 process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359 ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557 do_open fs/namei.c:3624 [inline] path_openat+0x4d05/0x5ac0 fs/namei.c:3779 do_filp_open+0x20d/0x590 fs/namei.c:3806 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_open fs/open.c:1427 [inline] __se_sys_open fs/open.c:1423 [inline] __x64_sys_open+0x275/0x2d0 fs/open.c:1423 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 4393 Comm: kworker/u5:1 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: erofs_worker z_erofs_decompressqueue_work ===================================================== --- 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
