Reporting this bug without the reproducer attached as it hits the character limit and the report bounces. The reproducer is available on request. On Wed, Feb 15, 2023 at 6:43 PM Dipanjan Das <mail.dipanjan.das@xxxxxxxxx> wrote: > > Hi, > > We would like to report the following bug which has been found by our > modified version of syzkaller. > > ====================================================== > description: KMSAN: uninit-value in nilfs_add_checksums_on_logs > affected file: fs/nilfs2/segbuf.c > kernel version: 6.2.0-rc5 > kernel commit: 41c66f47061608dc1fd493eebce198f0e74cc2d7 > git tree: kmsan > kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=a9a22da1efde3af6 > crash reproducer: attached > ====================================================== > Crash log: > ====================================================== > NILFS (loop4): segctord starting. Construction interval = 5 seconds, > CP frequency < 30 seconds > ===================================================== > BUG: KMSAN: uninit-value in crc32_body lib/crc32.c:112 [inline] > BUG: KMSAN: uninit-value in crc32_le_generic lib/crc32.c:179 [inline] > BUG: KMSAN: uninit-value in crc32_le_base+0x3b7/0xc30 lib/crc32.c:197 > crc32_body lib/crc32.c:112 [inline] > crc32_le_generic lib/crc32.c:179 [inline] > crc32_le_base+0x3b7/0xc30 lib/crc32.c:197 > nilfs_segbuf_fill_in_data_crc fs/nilfs2/segbuf.c:208 [inline] > nilfs_add_checksums_on_logs+0x6ec/0xea0 fs/nilfs2/segbuf.c:321 > nilfs_segctor_do_construct+0xa636/0xe870 fs/nilfs2/segment.c:2076 > nilfs_segctor_construct+0x222/0xe10 fs/nilfs2/segment.c:2379 > nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] > nilfs_segctor_thread+0xc19/0x11c0 fs/nilfs2/segment.c:2570 > kthread+0x30b/0x420 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > Uninit was created at: > __alloc_pages+0x767/0xee0 mm/page_alloc.c:5572 > alloc_pages+0xa9a/0xd90 mm/mempolicy.c:2286 > folio_alloc+0x41/0x100 mm/mempolicy.c:2296 > filemap_alloc_folio+0xa5/0x450 mm/filemap.c:972 > __filemap_get_folio+0xe7c/0x1960 mm/filemap.c:1966 > pagecache_get_page+0x46/0x270 mm/folio-compat.c:98 > find_or_create_page include/linux/pagemap.h:612 [inline] > grow_dev_page fs/buffer.c:946 [inline] > grow_buffers fs/buffer.c:1011 [inline] > __getblk_slow fs/buffer.c:1038 [inline] > __getblk_gfp+0x365/0x1750 fs/buffer.c:1333 > sb_getblk include/linux/buffer_head.h:356 [inline] > nilfs_segbuf_extend_segsum fs/nilfs2/segbuf.c:99 [inline] > nilfs_segbuf_reset+0xfd/0x520 fs/nilfs2/segbuf.c:129 > nilfs_segctor_reset_segment_buffer fs/nilfs2/segment.c:421 [inline] > nilfs_segctor_collect fs/nilfs2/segment.c:1499 [inline] > nilfs_segctor_do_construct+0x20c6/0xe870 fs/nilfs2/segment.c:2045 > nilfs_segctor_construct+0x222/0xe10 fs/nilfs2/segment.c:2379 > nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] > nilfs_segctor_thread+0xc19/0x11c0 fs/nilfs2/segment.c:2570 > kthread+0x30b/0x420 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > CPU: 1 PID: 11600 Comm: segctord Not tainted 6.2.0-rc5-00010-g41c66f470616 #8 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > 1.13.0-1ubuntu1.1 04/01/2014 > ===================================================== > > -- > Thanks and Regards, > > Dipanjan -- Thanks and Regards, Dipanjan
