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linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1563:b0:36d:cef6:7c8c with SMTP id e9e14a558f8ab-3737b423053mr6386955ab.5.1716785485308; Sun, 26 May 2024 21:51:25 -0700 (PDT) Date: Sun, 26 May 2024 21:51:25 -0700 In-Reply-To: <000000000000fd5e7006191f78dc@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000001f1c3061968450e@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_btree_node_iter_init From: syzbot To: bfoster@redhat.com, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=11daa71a980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=f321ecc68453b9ac9bff 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=16de2ee8980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d696dc980000 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 mounted in repro: https://storage.googleapis.com/syzbot-assets/73fc1c49d3bd/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f321ecc68453b9ac9bff@syzkaller.appspotmail.com bcachefs (loop0): shutting down bcachefs (loop0): going read-only bcachefs (loop0): finished waiting for writes to stop bcachefs (loop0): flushing journal and stopping allocators, journal seq 12 ===================================================== BUG: KMSAN: uninit-value in bkey_cmp_p_or_unp fs/bcachefs/bset.h:284 [inline] BUG: KMSAN: uninit-value in bkey_iter_cmp_p_or_unp fs/bcachefs/bset.h:398 [inline] BUG: KMSAN: uninit-value in bch2_bset_search_linear fs/bcachefs/bset.c:1217 [inline] BUG: KMSAN: uninit-value in bch2_btree_node_iter_init+0x3237/0x5280 fs/bcachefs/bset.c:1362 bkey_cmp_p_or_unp fs/bcachefs/bset.h:284 [inline] bkey_iter_cmp_p_or_unp fs/bcachefs/bset.h:398 [inline] bch2_bset_search_linear fs/bcachefs/bset.c:1217 [inline] bch2_btree_node_iter_init+0x3237/0x5280 fs/bcachefs/bset.c:1362 __btree_path_level_init fs/bcachefs/btree_iter.c:627 [inline] bch2_btree_path_level_init+0x821/0xc80 fs/bcachefs/btree_iter.c:647 btree_path_lock_root fs/bcachefs/btree_iter.c:781 [inline] bch2_btree_path_traverse_one+0x46e8/0x5290 fs/bcachefs/btree_iter.c:1178 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:225 [inline] bch2_btree_iter_traverse+0x99f/0xe90 fs/bcachefs/btree_iter.c:1741 btree_key_cache_flush_pos fs/bcachefs/btree_key_cache.c:667 [inline] bch2_btree_key_cache_journal_flush+0xf8d/0x1990 fs/bcachefs/btree_key_cache.c:748 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:553 journal_flush_done+0xe1/0x3f0 fs/bcachefs/journal_reclaim.c:806 bch2_journal_flush_pins+0xdb/0x3b0 fs/bcachefs/journal_reclaim.c:839 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline] __bch2_fs_read_only+0x1b9/0x750 fs/bcachefs/super.c:277 bch2_fs_read_only+0xcb4/0x1540 fs/bcachefs/super.c:357 __bch2_fs_stop+0x112/0x6f0 fs/bcachefs/super.c:622 bch2_put_super+0x3c/0x50 fs/bcachefs/fs.c:1791 generic_shutdown_super+0x194/0x4c0 fs/super.c:641 bch2_kill_sb+0x3d/0x70 fs/bcachefs/fs.c:2015 deactivate_locked_super+0xe0/0x3f0 fs/super.c:472 deactivate_super+0x14f/0x160 fs/super.c:505 cleanup_mnt+0x6c6/0x730 fs/namespace.c:1267 __cleanup_mnt+0x22/0x30 fs/namespace.c:1274 task_work_run+0x268/0x310 kernel/task_work.c:180 ptrace_notify+0x304/0x320 kernel/signal.c:2404 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0x14e/0x3e0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x135/0x160 kernel/entry/common.c:218 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __kmalloc_large_node+0x231/0x370 mm/slub.c:3994 __do_kmalloc_node mm/slub.c:4027 [inline] __kmalloc_node+0xb10/0x10c0 mm/slub.c:4046 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+0x7b6a/0x93e0 fs/bcachefs/recovery.c:785 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043 bch2_fs_open+0x152a/0x15f0 fs/bcachefs/super.c:2105 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1906 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: 0 PID: 5043 Comm: syz-executor855 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 ===================================================== --- 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.