From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E37EC8DD for ; Mon, 27 May 2024 05:46:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716788794; cv=none; b=aGsKSs3IQgxef0Sj6O2jL4PZbpX0y7Lud7N9X0gAXuNt6S6n8r8x9S40aezBSoLTAoiaH6q25DVoQOMdC10x3EQHAHSFgqofWbesR0J65m8TvNacq2BC/031TmxcFoyyBOXjQTL0ZOm5TNTsKURsKaOcFimFSUCaZ9dCoER71zA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716788794; c=relaxed/simple; bh=JDREHXtA6hrsuq9NcZhGYeSA55DsP9HTCLOFUmES4y8=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:158d:b0:7e2:b00:2277 with SMTP id ca18e2360f4ac-7e8c6933fa2mr41748139f.2.1716788792669; Sun, 26 May 2024 22:46:32 -0700 (PDT) Date: Sun, 26 May 2024 22:46:32 -0700 In-Reply-To: <000000000000e15f4b06193763db@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002447c40619690af2@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in rw_aux_tree_set 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 output: https://syzkaller.appspot.com/x/log.txt?x=124e4572980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=681f3c43b6970652376b 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=10b28f42980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142ddb52980000 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/61af6ba34933/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+681f3c43b6970652376b@syzkaller.appspotmail.com 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_unpack_pos fs/bcachefs/bkey.h:455 [inline] BUG: KMSAN: uninit-value in rw_aux_tree_set+0x4d2/0x580 fs/bcachefs/bset.c:521 bkey_unpack_pos fs/bcachefs/bkey.h:455 [inline] rw_aux_tree_set+0x4d2/0x580 fs/bcachefs/bset.c:521 bch2_bset_fix_lookup_table+0x16b2/0x1e90 fs/bcachefs/bset.c:995 bch2_bset_insert+0x1617/0x19f0 fs/bcachefs/bset.c:1042 bch2_btree_bset_insert_key+0xf56/0x2b70 fs/bcachefs/btree_trans_commit.c:194 bch2_btree_insert_key_leaf+0x276/0x1050 fs/bcachefs/btree_trans_commit.c:277 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:744 [inline] do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline] __bch2_trans_commit+0x98e6/0xab10 fs/bcachefs/btree_trans_commit.c:1093 bch2_trans_commit fs/bcachefs/btree_update.h:168 [inline] btree_key_cache_flush_pos fs/bcachefs/btree_key_cache.c:672 [inline] bch2_btree_key_cache_journal_flush+0x10f9/0x1990 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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/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: 5060 Comm: syz-executor338 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.