syzbot has found a reproducer for the following issue on: HEAD commit: 3b68086599f8 Merge tag 'sched_urgent_for_v6.9_rc5' of git:.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1717a99f180000 kernel config: https://syzkaller.appspot.com/x/.config?x=87a805e655619c64 dashboard link: https://syzkaller.appspot.com/bug?extid=9a049ebdaacbb076e50a 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=1293271b180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=173fe0fd180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6a0c6d102762/disk-3b680865.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/02126711948e/vmlinux-3b680865.xz kernel image: https://storage.googleapis.com/syzbot-assets/7d390469c033/bzImage-3b680865.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/4f2c52f00058/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9a049ebdaacbb076e50a@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in lzo1x_1_do_compress+0x913/0x2510 lib/lzo/lzo1x_compress.c:107 lzo1x_1_do_compress+0x913/0x2510 lib/lzo/lzo1x_compress.c:107 lzogeneric1x_1_compress+0x26a/0x11b0 lib/lzo/lzo1x_compress.c:333 lzo1x_1_compress+0x47/0x80 lib/lzo/lzo1x_compress.c:383 __lzo_compress crypto/lzo.c:58 [inline] lzo_scompress+0x98/0x180 crypto/lzo.c:79 scomp_acomp_comp_decomp+0x7c6/0xb90 scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187 crypto_acomp_compress include/crypto/acompress.h:308 [inline] zswap_compress+0x377/0xb10 mm/zswap.c:1040 zswap_store+0x2180/0x2ca0 mm/zswap.c:1573 swap_writepage+0x126/0x4c0 mm/page_io.c:198 shmem_writepage+0x1826/0x1f70 mm/shmem.c:1518 pageout mm/vmscan.c:660 [inline] shrink_folio_list+0x4a55/0x7910 mm/vmscan.c:1323 evict_folios+0x9d7f/0xcc20 mm/vmscan.c:4537 try_to_shrink_lruvec+0x160e/0x1a50 mm/vmscan.c:4733 shrink_one+0x66f/0xd40 mm/vmscan.c:4772 shrink_many mm/vmscan.c:4835 [inline] lru_gen_shrink_node mm/vmscan.c:4935 [inline] shrink_node+0x4856/0x55f0 mm/vmscan.c:5894 kswapd_shrink_node mm/vmscan.c:6704 [inline] balance_pgdat mm/vmscan.c:6895 [inline] kswapd+0x1eba/0x4460 mm/vmscan.c:7164 kthread+0x3e2/0x540 kernel/kthread.c:388 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was stored to memory at: memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_page_from_iter_atomic+0x12b7/0x2b60 lib/iov_iter.c:481 generic_perform_write+0x4c1/0xc60 mm/filemap.c:3982 shmem_file_write_iter+0x2bd/0x2f0 mm/shmem.c:2920 do_iter_readv_writev+0x7e6/0x960 vfs_iter_write+0x459/0xd00 fs/read_write.c:895 lo_write_bvec drivers/block/loop.c:246 [inline] lo_write_simple drivers/block/loop.c:267 [inline] do_req_filebacked drivers/block/loop.c:491 [inline] loop_handle_cmd drivers/block/loop.c:1907 [inline] loop_process_work+0x1502/0x3440 drivers/block/loop.c:1942 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1973 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa81/0x1bd0 kernel/workqueue.c:3335 worker_thread+0xea5/0x1560 kernel/workqueue.c:3416 kthread+0x3e2/0x540 kernel/kthread.c:388 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was stored to memory at: ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450 indx_write fs/ntfs3/index.c:1027 [inline] indx_insert_into_root+0x36f4/0x37d0 fs/ntfs3/index.c:1761 indx_insert_entry+0xe1d/0xee0 fs/ntfs3/index.c:1975 ntfs_create_inode+0x49b6/0x5100 fs/ntfs3/inode.c:1671 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434 atomic_open fs/namei.c:3360 [inline] lookup_open fs/namei.c:3468 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x2230/0x5b00 fs/namei.c:3796 do_filp_open+0x20e/0x590 fs/namei.c:3826 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_creat fs/open.c:1497 [inline] __se_sys_creat fs/open.c:1491 [inline] __x64_sys_creat+0xe6/0x140 fs/open.c:1491 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: hdr_insert_de+0x3d4/0x3f0 fs/ntfs3/index.c:838 indx_insert_into_root+0x33f6/0x37d0 fs/ntfs3/index.c:1753 indx_insert_entry+0xe1d/0xee0 fs/ntfs3/index.c:1975 ntfs_create_inode+0x49b6/0x5100 fs/ntfs3/inode.c:1671 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434 atomic_open fs/namei.c:3360 [inline] lookup_open fs/namei.c:3468 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x2230/0x5b00 fs/namei.c:3796 do_filp_open+0x20e/0x590 fs/namei.c:3826 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_creat fs/open.c:1497 [inline] __se_sys_creat fs/open.c:1491 [inline] __x64_sys_creat+0xe6/0x140 fs/open.c:1491 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x5b6/0xbe0 mm/slub.c:3852 ntfs_create_inode+0x5e0/0x5100 fs/ntfs3/inode.c:1314 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434 atomic_open fs/namei.c:3360 [inline] lookup_open fs/namei.c:3468 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x2230/0x5b00 fs/namei.c:3796 do_filp_open+0x20e/0x590 fs/namei.c:3826 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_creat fs/open.c:1497 [inline] __se_sys_creat fs/open.c:1491 [inline] __x64_sys_creat+0xe6/0x140 fs/open.c:1491 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 PID: 80 Comm: kswapd0 Not tainted 6.9.0-rc4-syzkaller-00274-g3b68086599f8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- 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.
