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Message-ID: <000000000000d0f165061a6754c3@google.com> Date: Sat, 08 Jun 2024 14:09:27 -0700 From: syzbot <syzbot+9c1fe13fcb51574b249b@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, chengming.zhou@...ux.dev, hannes@...xchg.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, nphamcs@...il.com, syzkaller-bugs@...glegroups.com, yosryahmed@...gle.com Subject: [syzbot] [mm?] KMSAN: uninit-value in zswap_store Hello, syzbot found the following issue on: HEAD commit: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=113f3fd6980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=9c1fe13fcb51574b249b 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/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c1fe13fcb51574b249b@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in zswap_is_page_same_filled mm/zswap.c:1481 [inline] BUG: KMSAN: uninit-value in zswap_store+0x1008/0x2ca0 mm/zswap.c:1553 zswap_is_page_same_filled mm/zswap.c:1481 [inline] zswap_store+0x1008/0x2ca0 mm/zswap.c:1553 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:389 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+0x12b7/0x2ae0 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:3267 [inline] process_scheduled_works+0xa81/0x1bd0 kernel/workqueue.c:3348 worker_thread+0xea5/0x1560 kernel/workqueue.c:3429 kthread+0x3e2/0x540 kernel/kthread.c:389 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 created at: __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264 alloc_pages mm/mempolicy.c:2335 [inline] folio_alloc+0x1d0/0x230 mm/mempolicy.c:2342 filemap_alloc_folio+0xa6/0x440 mm/filemap.c:984 __filemap_get_folio+0xa10/0x14b0 mm/filemap.c:1926 grow_dev_folio fs/buffer.c:1042 [inline] grow_buffers fs/buffer.c:1108 [inline] __getblk_slow fs/buffer.c:1134 [inline] bdev_getblk+0x39b/0xc80 fs/buffer.c:1429 __getblk include/linux/buffer_head.h:355 [inline] sb_getblk include/linux/buffer_head.h:361 [inline] ext4_getblk+0x3da/0xe00 fs/ext4/inode.c:843 ext4_xattr_inode_write fs/ext4/xattr.c:1421 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1596 [inline] ext4_xattr_set_entry+0x574d/0x6880 fs/ext4/xattr.c:1718 ext4_xattr_block_set+0xb94/0x4fb0 fs/ext4/xattr.c:2037 ext4_xattr_move_to_block fs/ext4/xattr.c:2654 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2729 [inline] ext4_expand_extra_isize_ea+0x20bd/0x3560 fs/ext4/xattr.c:2821 __ext4_expand_extra_isize+0x5dc/0x680 fs/ext4/inode.c:5789 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5832 [inline] __ext4_mark_inode_dirty+0x70d/0xa10 fs/ext4/inode.c:5910 ext4_delete_inline_entry+0x650/0x7d0 fs/ext4/inline.c:1753 ext4_delete_entry+0x13f/0x7d0 fs/ext4/namei.c:2719 __ext4_unlink+0x9b8/0x11b0 fs/ext4/namei.c:3273 ext4_unlink+0x226/0x630 fs/ext4/namei.c:3321 vfs_unlink+0x676/0xa30 fs/namei.c:4343 do_unlinkat+0x823/0xe10 fs/namei.c:4407 __do_sys_unlinkat fs/namei.c:4450 [inline] __se_sys_unlinkat fs/namei.c:4443 [inline] __x64_sys_unlinkat+0x17c/0x230 fs/namei.c:4443 x64_sys_call+0x846/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:264 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: 1 PID: 88 Comm: kswapd1 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 ===================================================== --- 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@...glegroups.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
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