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Message-ID: <0000000000009f9447061833d477@google.com> Date: Sat, 11 May 2024 13:52:29 -0700 From: syzbot <syzbot+eceea46e8838baeeba67@...kaller.appspotmail.com> To: bfoster@...hat.com, kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_extent_update_i_size_sectors Hello, syzbot found the following issue on: HEAD commit: dccb07f2914c Merge tag 'for-6.9-rc7-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14c66e24980000 kernel config: https://syzkaller.appspot.com/x/.config?x=617171361dd3cd47 dashboard link: https://syzkaller.appspot.com/bug?extid=eceea46e8838baeeba67 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/fdbc7be30633/disk-dccb07f2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a9e4c11aa835/vmlinux-dccb07f2.xz kernel image: https://storage.googleapis.com/syzbot-assets/43c3a343ea93/bzImage-dccb07f2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eceea46e8838baeeba67@...kaller.appspotmail.com bcachefs (loop0): snapshots_read... done bcachefs (loop0): journal_replay... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): going read-write bcachefs (loop0): done starting filesystem ===================================================== BUG: KMSAN: uninit-value in bch2_extent_update_i_size_sectors+0x140f/0x17d0 fs/bcachefs/io_write.c:237 bch2_extent_update_i_size_sectors+0x140f/0x17d0 fs/bcachefs/io_write.c:237 bch2_extent_update+0x4f5/0xac0 fs/bcachefs/io_write.c:314 bch2_write_index_default fs/bcachefs/io_write.c:366 [inline] __bch2_write_index+0x1653/0x2bd0 fs/bcachefs/io_write.c:520 bch2_write_data_inline fs/bcachefs/io_write.c:1538 [inline] bch2_write+0x1a13/0x1b40 fs/bcachefs/io_write.c:1606 closure_queue include/linux/closure.h:257 [inline] closure_call include/linux/closure.h:390 [inline] bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:468 [inline] bch2_writepages+0x24a/0x3c0 fs/bcachefs/fs-io-buffered.c:660 do_writepages+0x427/0xc30 mm/page-writeback.c:2612 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397 __filemap_fdatawrite_range+0xe3/0x120 mm/filemap.c:430 sync_file_range+0x316/0x450 fs/sync.c:292 ksys_sync_file_range fs/sync.c:364 [inline] __do_sys_sync_file_range fs/sync.c:373 [inline] __se_sys_sync_file_range fs/sync.c:370 [inline] __x64_sys_sync_file_range+0x15a/0x2a0 fs/sync.c:370 x64_sys_call+0xc90/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:278 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: memcpy_u64s_small fs/bcachefs/util.h:511 [inline] bkey_reassemble fs/bcachefs/bkey.h:505 [inline] __bch2_bkey_make_mut_noupdate fs/bcachefs/btree_update.h:225 [inline] __bch2_bkey_get_mut_noupdate fs/bcachefs/btree_update.h:282 [inline] bch2_bkey_get_mut_noupdate fs/bcachefs/btree_update.h:293 [inline] bch2_extent_update_i_size_sectors+0x9a9/0x17d0 fs/bcachefs/io_write.c:219 bch2_extent_update+0x4f5/0xac0 fs/bcachefs/io_write.c:314 bch2_write_index_default fs/bcachefs/io_write.c:366 [inline] __bch2_write_index+0x1653/0x2bd0 fs/bcachefs/io_write.c:520 bch2_write_data_inline fs/bcachefs/io_write.c:1538 [inline] bch2_write+0x1a13/0x1b40 fs/bcachefs/io_write.c:1606 closure_queue include/linux/closure.h:257 [inline] closure_call include/linux/closure.h:390 [inline] bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:468 [inline] bch2_writepages+0x24a/0x3c0 fs/bcachefs/fs-io-buffered.c:660 do_writepages+0x427/0xc30 mm/page-writeback.c:2612 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397 __filemap_fdatawrite_range+0xe3/0x120 mm/filemap.c:430 sync_file_range+0x316/0x450 fs/sync.c:292 ksys_sync_file_range fs/sync.c:364 [inline] __do_sys_sync_file_range fs/sync.c:373 [inline] __se_sys_sync_file_range fs/sync.c:370 [inline] __x64_sys_sync_file_range+0x15a/0x2a0 fs/sync.c:370 x64_sys_call+0xc90/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:278 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: memcpy_u64s_small fs/bcachefs/util.h:511 [inline] bkey_reassemble fs/bcachefs/bkey.h:505 [inline] btree_key_cache_fill fs/bcachefs/btree_key_cache.c:454 [inline] bch2_btree_path_traverse_cached_slowpath+0x5f02/0x79f0 fs/bcachefs/btree_key_cache.c:530 bch2_btree_path_traverse_cached+0xd1a/0x1140 bch2_btree_path_traverse_one+0x737/0x5290 fs/bcachefs/btree_iter.c:1155 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:225 [inline] bch2_btree_iter_peek_slot+0x128c/0x3840 fs/bcachefs/btree_iter.c:2473 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:549 [inline] __bch2_bkey_get_mut_noupdate fs/bcachefs/btree_update.h:278 [inline] bch2_bkey_get_mut_noupdate fs/bcachefs/btree_update.h:293 [inline] bch2_extent_update_i_size_sectors+0x404/0x17d0 fs/bcachefs/io_write.c:219 bch2_extent_update+0x4f5/0xac0 fs/bcachefs/io_write.c:314 bch2_write_index_default fs/bcachefs/io_write.c:366 [inline] __bch2_write_index+0x1653/0x2bd0 fs/bcachefs/io_write.c:520 bch2_write_data_inline fs/bcachefs/io_write.c:1538 [inline] bch2_write+0x1a13/0x1b40 fs/bcachefs/io_write.c:1606 closure_queue include/linux/closure.h:257 [inline] closure_call include/linux/closure.h:390 [inline] bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:468 [inline] bch2_writepages+0x24a/0x3c0 fs/bcachefs/fs-io-buffered.c:660 do_writepages+0x427/0xc30 mm/page-writeback.c:2612 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397 __filemap_fdatawrite_range+0xe3/0x120 mm/filemap.c:430 sync_file_range+0x316/0x450 fs/sync.c:292 ksys_sync_file_range fs/sync.c:364 [inline] __do_sys_sync_file_range fs/sync.c:373 [inline] __se_sys_sync_file_range fs/sync.c:370 [inline] __x64_sys_sync_file_range+0x15a/0x2a0 fs/sync.c:370 x64_sys_call+0xc90/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:278 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: __kmalloc_large_node+0x231/0x370 mm/slub.c:3927 __do_kmalloc_node mm/slub.c:3960 [inline] __kmalloc_node+0xb10/0x10c0 mm/slub.c:3979 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] btree_bounce_alloc fs/bcachefs/btree_io.c:118 [inline] bch2_btree_node_read_done+0x4e68/0x75e0 fs/bcachefs/btree_io.c:1185 btree_node_read_work+0x8a5/0x1eb0 fs/bcachefs/btree_io.c:1324 bch2_btree_node_read+0x3d42/0x4b50 __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline] bch2_btree_root_read+0xa6c/0x13d0 fs/bcachefs/btree_io.c:1772 read_btree_roots+0x454/0xee0 fs/bcachefs/recovery.c:457 bch2_fs_recovery+0x7adb/0x9310 fs/bcachefs/recovery.c:785 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043 bch2_fs_open+0x135f/0x1670 fs/bcachefs/super.c:2102 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1903 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1779 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166 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: 6218 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- 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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