From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (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 091E9C8D7 for ; Fri, 25 Oct 2024 01:08:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729818511; cv=none; b=H4MHDf7p/EjLr+XtWYnNyG3HHNp0S5NgfNle0wXwjbLvPLbM3EcZXW2vgwLkGb7KyrSA7SbDa0kJdTh4vYHwBTosfJQgBLVoMf7ru7vA5ymGkwDyidGP1VSffzxuGktgWbVMhMV+PuF99NhRPZAp6696EfyyW16WMkgMJHW072Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729818511; c=relaxed/simple; bh=sAQ0ZmVoGtksxsZsfHPitllYpir1CyxYAHmLSaO+Xa8=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1c4e:b0:3a0:90d6:1f39 with SMTP id e9e14a558f8ab-3a4d592cc9bmr83546765ab.2.1729818505852; Thu, 24 Oct 2024 18:08:25 -0700 (PDT) Date: Thu, 24 Oct 2024 18:08:25 -0700 In-Reply-To: <66fa0328.050a0220.6bad9.002c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <671aef89.050a0220.381c35.0006.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] possible deadlock in ocfs2_acquire_dquot 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" syzbot has found a reproducer for the following issue on: HEAD commit: ce8e69898653 Merge remote-tracking branch 'tip/irq/core' i.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=12bfe65f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cf20d4aad28662c6 dashboard link: https://syzkaller.appspot.com/bug?extid=51244a05705883616c95 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ca5e40580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14583287980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c4140162bfaa/disk-ce8e6989.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9cc02a082c01/vmlinux-ce8e6989.xz kernel image: https://storage.googleapis.com/syzbot-assets/4ca0d2cc7b00/Image-ce8e6989.gz.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/fae7f4b73536/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/60abe9617ec0/mount_3.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+51244a05705883616c95@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc4-syzkaller-gce8e69898653 #0 Not tainted ------------------------------------------------------ syz-executor217/6496 is trying to acquire lock: ffff0000d451e610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x3c4/0xa8c fs/ocfs2/quota_global.c:855 but task is already holding lock: ffff0000e202dbe0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1d4/0x260 fs/ocfs2/quota_global.c:314 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 ocfs2_lock_global_qf+0x1d4/0x260 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x268/0xa8c fs/ocfs2/quota_global.c:823 dqget+0x660/0xcec fs/quota/dquot.c:976 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1504 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1566 ocfs2_get_init_inode+0x14c/0x1b8 fs/ocfs2/namei.c:202 ocfs2_mknod+0x878/0x243c fs/ocfs2/namei.c:308 ocfs2_create+0x194/0x4e0 fs/ocfs2/namei.c:672 lookup_open fs/namei.c:3595 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x13e4/0x2b14 fs/namei.c:3930 do_filp_open+0x1bc/0x3cc fs/namei.c:3960 do_sys_openat2+0x124/0x1b8 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1441 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] ocfs2_lock_global_qf+0x1b8/0x260 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x268/0xa8c fs/ocfs2/quota_global.c:823 dqget+0x660/0xcec fs/quota/dquot.c:976 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1504 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1566 ocfs2_get_init_inode+0x14c/0x1b8 fs/ocfs2/namei.c:202 ocfs2_mknod+0x878/0x243c fs/ocfs2/namei.c:308 ocfs2_create+0x194/0x4e0 fs/ocfs2/namei.c:672 lookup_open fs/namei.c:3595 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x13e4/0x2b14 fs/namei.c:3930 do_filp_open+0x1bc/0x3cc fs/namei.c:3960 do_sys_openat2+0x124/0x1b8 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1441 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #4 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 wait_on_dquot fs/quota/dquot.c:355 [inline] dqget+0x5f0/0xcec fs/quota/dquot.c:971 dquot_transfer+0x3a8/0x5c0 fs/quota/dquot.c:2153 ext4_setattr+0x8bc/0x1624 fs/ext4/inode.c:5368 notify_change+0x9f0/0xca0 fs/attr.c:503 chown_common+0x438/0x700 fs/open.c:793 vfs_fchown fs/open.c:861 [inline] ksys_fchown+0xe0/0x158 fs/open.c:872 __do_sys_fchown fs/open.c:880 [inline] __se_sys_fchown fs/open.c:878 [inline] __arm64_sys_fchown+0x7c/0x94 fs/open.c:878 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #3 (&ei->xattr_sem){++++}-{3:3}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 ext4_write_lock_xattr fs/ext4/xattr.h:154 [inline] ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2373 ext4_initxattrs+0xa4/0x11c fs/ext4/xattr_security.c:44 security_inode_init_security+0x73c/0x908 security/security.c:1848 ext4_init_security+0x44/0x58 fs/ext4/xattr_security.c:58 __ext4_new_inode+0x2be8/0x3830 fs/ext4/ialloc.c:1323 ext4_create+0x234/0x480 fs/ext4/namei.c:2834 lookup_open fs/namei.c:3595 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x13e4/0x2b14 fs/namei.c:3930 do_filp_open+0x1bc/0x3cc fs/namei.c:3960 do_sys_openat2+0x124/0x1b8 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1441 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (jbd2_handle){.+.+}-{0:0}: start_this_handle+0xf34/0x11c4 fs/jbd2/transaction.c:448 jbd2__journal_start+0x298/0x544 fs/jbd2/transaction.c:505 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:544 ocfs2_start_trans+0x3d0/0x71c fs/ocfs2/journal.c:352 ocfs2_modify_bh+0xe4/0x484 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x1220/0x15bc fs/ocfs2/quota_local.c:771 dquot_load_quota_sb+0x6e4/0xb24 fs/quota/dquot.c:2458 dquot_load_quota_inode+0x280/0x4f4 fs/quota/dquot.c:2495 ocfs2_enable_quotas+0x17c/0x3cc fs/ocfs2/super.c:926 ocfs2_fill_super+0x3f04/0x49d0 fs/ocfs2/super.c:1141 mount_bdev+0x1d4/0x2a0 fs/super.c:1679 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1188 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x28c fs/super.c:1800 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount fs/namespace.c:4032 [inline] __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:4032 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1524 ocfs2_start_trans+0x3c4/0x71c fs/ocfs2/journal.c:350 ocfs2_modify_bh+0xe4/0x484 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x1220/0x15bc fs/ocfs2/quota_local.c:771 dquot_load_quota_sb+0x6e4/0xb24 fs/quota/dquot.c:2458 dquot_load_quota_inode+0x280/0x4f4 fs/quota/dquot.c:2495 ocfs2_enable_quotas+0x17c/0x3cc fs/ocfs2/super.c:926 ocfs2_fill_super+0x3f04/0x49d0 fs/ocfs2/super.c:1141 mount_bdev+0x1d4/0x2a0 fs/super.c:1679 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1188 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x28c fs/super.c:1800 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount fs/namespace.c:4032 [inline] __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:4032 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (sb_internal#2){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1716 [inline] sb_start_intwrite include/linux/fs.h:1899 [inline] ocfs2_start_trans+0x244/0x71c fs/ocfs2/journal.c:348 ocfs2_acquire_dquot+0x3c4/0xa8c fs/ocfs2/quota_global.c:855 dqget+0x660/0xcec fs/quota/dquot.c:976 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1504 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1566 ocfs2_get_init_inode+0x14c/0x1b8 fs/ocfs2/namei.c:202 ocfs2_mknod+0x878/0x243c fs/ocfs2/namei.c:308 ocfs2_create+0x194/0x4e0 fs/ocfs2/namei.c:672 lookup_open fs/namei.c:3595 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x13e4/0x2b14 fs/namei.c:3930 do_filp_open+0x1bc/0x3cc fs/namei.c:3960 do_sys_openat2+0x124/0x1b8 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1441 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: sb_internal#2 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3 --> &ocfs2_quota_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_quota_ip_alloc_sem_key); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3); lock(&ocfs2_quota_ip_alloc_sem_key); rlock(sb_internal#2); *** DEADLOCK *** 6 locks held by syz-executor217/6496: #0: ffff0000d451e420 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:515 #1: ffff0000e20289c0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff0000e20289c0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3691 [inline] #1: ffff0000e20289c0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x684/0x2b14 fs/namei.c:3930 #2: ffff0000e21a9800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #2: ffff0000e21a9800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x164/0x4288 fs/ocfs2/suballoc.c:786 #3: ffff0000e20400a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_acquire_dquot+0x25c/0xa8c fs/ocfs2/quota_global.c:818 #4: ffff0000e202df40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #4: ffff0000e202df40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1b8/0x260 fs/ocfs2/quota_global.c:313 #5: ffff0000e202dbe0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1d4/0x260 fs/ocfs2/quota_global.c:314 stack backtrace: CPU: 1 UID: 0 PID: 6496 Comm: syz-executor217 Not tainted 6.12.0-rc4-syzkaller-gce8e69898653 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1716 [inline] sb_start_intwrite include/linux/fs.h:1899 [inline] ocfs2_start_trans+0x244/0x71c fs/ocfs2/journal.c:348 ocfs2_acquire_dquot+0x3c4/0xa8c fs/ocfs2/quota_global.c:855 dqget+0x660/0xcec fs/quota/dquot.c:976 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1504 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1566 ocfs2_get_init_inode+0x14c/0x1b8 fs/ocfs2/namei.c:202 ocfs2_mknod+0x878/0x243c fs/ocfs2/namei.c:308 ocfs2_create+0x194/0x4e0 fs/ocfs2/namei.c:672 lookup_open fs/namei.c:3595 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x13e4/0x2b14 fs/namei.c:3930 do_filp_open+0x1bc/0x3cc fs/namei.c:3960 do_sys_openat2+0x124/0x1b8 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1441 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 --- If you want syzbot to run the reproducer, reply with: 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