From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (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 19E69156880 for ; Fri, 6 Sep 2024 16:20:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725639630; cv=none; b=ojetdYbMun7WvhfW/NqG5xw0TOTgBHHJ0xUuOgXhOnlhfBeVn7DYnInm8GGA4Aa+l66YUkMtoHEAU9CdrEJQJCfzPZl4i2TDADz66EXwd9jy4H60ukLc43fd/WoGN8j+GblCkYLJzbq/vBUZcKB/5u45GnUu6wudS4OzNsTD7h8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725639630; c=relaxed/simple; bh=8phRWTUPx/h63ImVyA2fWukk+9GaTu/ewCFKTSB4t9w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=O0FQWhyeKd3prVY/3if0xVvvXn2MBaVPgE4QfBWkhBxl7KT5XX2J0zz0WlKjhR0LeOis5HRYUYx2uMXWTO+iZ6rFq6m7RjH3fPSHJb7XIIg3xV5iwccLeeHaclOLeXqZeGJ9wwmRhvzeBfTsAy77tGj/lgzadJ9FKKp8G64Zer4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f69.google.com with SMTP id ca18e2360f4ac-82a21f28d87so465615039f.3 for ; Fri, 06 Sep 2024 09:20:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725639628; x=1726244428; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=OzgTD5nDx4mrru7Wd0mjDvl8Z+hQAv0pV9FuX0feNc8=; b=WVz84s+Rs0Dooor6zq0HFdyAw8XZJ43cYnKuUVAmoAKYYpwmTf4hv8Pzwmm6Pq3ygf 8RUomGn1aYalnKAQznT5qLpMgytntTUlW2izQ2MLfGrojnDiJ/EaPmTHWz4chAAThq5o 2o24XwRt2Y8eEO0dwO1FhQqBPDhKCEuunkO7URiOwYdf9gjv/b0x6rJeut3cKvtRzHAb RdwkpWPoB338fdxVnUJQ2VTh3mpin4kUynyIl/LTBLHSPpXYI2AuoOBQSpjO/vrVOaHA NuEBxbf5nfCzeOI/iT17ckREm1EkNSRU9rCqVm/4qXU6w38kHFIQBRTybnBJe1ykcvY/ J3TA== X-Forwarded-Encrypted: i=1; AJvYcCXVuJFeEhxsw3dAte4rD28VovvzEGJ90OYTtzl5JJzxpXu4qy7HJMZPNGyERp5u6+602zGYsWfFnLi/4NE=@vger.kernel.org X-Gm-Message-State: AOJu0YydLdzMbd1g4fn39eP/NQFX/qwxXU3s5CYdUcn7gAHI5dE9vJ/+ /HKWzKAuEA3KdyD7yuu8meEiSQ5W4obgPbEeAuMzgJuAcYZ+L/ikrx5AP71JodCmZv3yi6LiZff eVfjx0RjjJmMz+ngee6eHKT5vrGH2mF4Ek3mOU/VoRqBu5YlS/Vw0Tm4= X-Google-Smtp-Source: AGHT+IEuBLB1xGqeHl3LSc8yrhQ1mQowNq2ECAFReKXZ8rrxI1S6P2hl+1wpMLW6zD++2Ie21kc5uh1Dx0tOgFLy8oxrdc3opKs2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:6c84:b0:4b9:e5b4:67fd with SMTP id 8926c6da1cb9f-4d084e65b5dmr167888173.1.1725639628249; Fri, 06 Sep 2024 09:20:28 -0700 (PDT) Date: Fri, 06 Sep 2024 09:20:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000d6e15062175c9ae@google.com> Subject: [syzbot] [ocfs2?] possible deadlock in ocfs2_lock_refcount_tree From: syzbot To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 67784a74e258 Merge tag 'ata-6.11-rc7' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11ed88af980000 kernel config: https://syzkaller.appspot.com/x/.config?x=660f6eb11f9c7dc5 dashboard link: https://syzkaller.appspot.com/bug?extid=285cfeaeb4ba53a373aa 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-67784a74.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e2f2583cf0b1/vmlinux-67784a74.xz kernel image: https://storage.googleapis.com/syzbot-assets/0fedd864addd/bzImage-67784a74.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+285cfeaeb4ba53a373aa@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5106) BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d BTRFS info (device loop0): using sha256 (sha256-avx2) checksum algorithm BTRFS error (device loop0): superblock checksum mismatch BTRFS error (device loop0): open_ctree failed loop0: detected capacity change from 0 to 32768 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Not tainted ------------------------------------------------------ syz.0.0/5106 is trying to acquire lock: ffff888040fa4098 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ffff888040fa4098 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x1fe/0xa70 fs/ocfs2/refcounttree.c:462 but task is already holding lock: ffff8880413b8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x372/0x1560 fs/ocfs2/file.c:471 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1526 ocfs2_read_virt_blocks+0x2ca/0xa50 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x43b/0x2780 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xff/0x360 fs/ocfs2/dir.c:1980 ocfs2_lookup_ino_from_name+0xb1/0x1e0 fs/ocfs2/dir.c:2002 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x305/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x32c/0x730 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline] ocfs2_fill_super+0x3068/0x5880 fs/ocfs2/super.c:994 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 ocfs2_get_system_file_inode+0x18f/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x16f/0x4eb0 fs/ocfs2/suballoc.c:780 ocfs2_reserve_new_metadata_blocks+0x41c/0x9c0 fs/ocfs2/suballoc.c:982 ocfs2_add_refcount_flag+0x4a0/0x1150 fs/ocfs2/refcounttree.c:3683 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4542 [inline] ocfs2_reflink_remap_blocks+0xe58/0x1f30 fs/ocfs2/refcounttree.c:4669 ocfs2_remap_file_range+0x600/0x8e0 fs/ocfs2/file.c:2724 vfs_copy_file_range+0xc1f/0x1530 fs/read_write.c:1522 __do_sys_copy_file_range fs/read_write.c:1612 [inline] __se_sys_copy_file_range+0x3f2/0x5d0 fs/read_write.c:1575 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&new->rf_sem){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_write+0x99/0x220 kernel/locking/rwsem.c:1579 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ocfs2_lock_refcount_tree+0x1fe/0xa70 fs/ocfs2/refcounttree.c:462 ocfs2_commit_truncate+0xc78/0x2560 fs/ocfs2/alloc.c:7345 ocfs2_truncate_file+0xd0e/0x1560 fs/ocfs2/file.c:509 ocfs2_setattr+0x1217/0x1f50 fs/ocfs2/file.c:1208 notify_change+0xbca/0xe90 fs/attr.c:503 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3381 [inline] do_open fs/namei.c:3731 [inline] path_openat+0x2ced/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_open fs/open.c:1439 [inline] __se_sys_open fs/open.c:1435 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1435 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &new->rf_sem --> &osb->system_file_mutex --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&new->rf_sem); *** DEADLOCK *** 3 locks held by syz.0.0/5106: #0: ffff888040330420 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff8880413b89c0 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline] #1: ffff8880413b89c0 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: do_truncate+0x20c/0x310 fs/open.c:63 #2: ffff8880413b8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x372/0x1560 fs/ocfs2/file.c:471 stack backtrace: CPU: 0 UID: 0 PID: 5106 Comm: syz.0.0 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_write+0x99/0x220 kernel/locking/rwsem.c:1579 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:427 [inline] ocfs2_lock_refcount_tree+0x1fe/0xa70 fs/ocfs2/refcounttree.c:462 ocfs2_commit_truncate+0xc78/0x2560 fs/ocfs2/alloc.c:7345 ocfs2_truncate_file+0xd0e/0x1560 fs/ocfs2/file.c:509 ocfs2_setattr+0x1217/0x1f50 fs/ocfs2/file.c:1208 notify_change+0xbca/0xe90 fs/attr.c:503 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3381 [inline] do_open fs/namei.c:3731 [inline] path_openat+0x2ced/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_open fs/open.c:1439 [inline] __se_sys_open fs/open.c:1435 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1435 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4924979eb9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4925732038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f4924b15f80 RCX: 00007f4924979eb9 RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180 RBP: 00007f49249e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4924b15f80 R15: 00007ffd762ef968 --- 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@googlegroups.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