From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-f69.google.com ([209.85.166.69]:44542 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727097AbeJPWPr (ORCPT ); Tue, 16 Oct 2018 18:15:47 -0400 Received: by mail-io1-f69.google.com with SMTP id s15-v6so21464305iob.11 for ; Tue, 16 Oct 2018 07:25:03 -0700 (PDT) MIME-Version: 1.0 Date: Tue, 16 Oct 2018 07:25:03 -0700 Message-ID: <000000000000cd1e2205785951c2@google.com> Subject: possible deadlock in __generic_file_fsync From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: 6d5d82417dd6 Add linux-next specific files for 20181016 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10c8e495400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e55f86f01cf5131 dashboard link: https://syzkaller.appspot.com/bug?extid=5cd33f0e6abe2bb3e397 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5cd33f0e6abe2bb3e397@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc8-next-20181016+ #95 Not tainted ------------------------------------------------------ kworker/1:1/22 is trying to acquire lock: 000000009092b9a9 (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:764 [inline] 000000009092b9a9 (&sb->s_type->i_mutex_key#10){++++}, at: __generic_file_fsync+0xb5/0x200 fs/libfs.c:999 but task is already holding lock: 000000000349cf73 ((work_completion)(&dio->complete_work)){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env -> #2 ((work_completion)(&dio->complete_work)){+.+.}: process_one_work+0xc0a/0x1c40 kernel/workqueue.c:2129 kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 -> #1 ((wq_completion)"dio/%s"sb->s_id){+.+.}: flush_workqueue+0x30a/0x1e10 kernel/workqueue.c:2655 drain_workqueue+0x2a9/0x640 kernel/workqueue.c:2820 destroy_workqueue+0xc6/0x9c0 kernel/workqueue.c:4155 sb_init_dio_done_wq+0x74/0x90 fs/direct-io.c:634 dio_set_defer_completion fs/direct-io.c:646 [inline] get_more_blocks fs/direct-io.c:723 [inline] do_direct_IO fs/direct-io.c:1001 [inline] do_blockdev_direct_IO+0x5bd9/0xefa0 fs/direct-io.c:1331 __blockdev_direct_IO+0x9d/0xc6 fs/direct-io.c:1417 ext4_direct_IO_write fs/ext4/inode.c:3774 [inline] ext4_direct_IO+0xadd/0x2210 fs/ext4/inode.c:3901 generic_file_direct_write+0x275/0x4b0 mm/filemap.c:2951 __generic_file_write_iter+0x2ff/0x630 mm/filemap.c:3130 ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1844 [inline] aio_write+0x3b1/0x610 fs/aio.c:1562 io_submit_one+0xaa1/0xf80 fs/aio.c:1836 __do_sys_io_submit fs/aio.c:1917 [inline] __se_sys_io_submit fs/aio.c:1888 [inline] __x64_sys_io_submit+0x1b7/0x580 fs/aio.c:1888 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sb->s_type->i_mutex_key#10){++++}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3845 down_write+0x8a/0x130 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:764 [inline] __generic_file_fsync+0xb5/0x200 fs/libfs.c:999 ext4_sync_file+0xa45/0x1500 fs/ext4/fsync.c:120 vfs_fsync_range+0x140/0x220 fs/sync.c:197 generic_write_sync include/linux/fs.h:2776 [inline] dio_complete+0x75c/0x9e0 fs/direct-io.c:329 dio_aio_complete_work+0x20/0x30 fs/direct-io.c:341 process_one_work+0xc8b/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#10 --> (wq_completion)"dio/%s"sb->s_id --> (work_completion)(&dio->complete_work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((work_completion)(&dio->complete_work)); lock((wq_completion)"dio/%s"sb->s_id); lock((work_completion)(&dio->complete_work)); lock(&sb->s_type->i_mutex_key#10); *** DEADLOCK *** 2 locks held by kworker/1:1/22: #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: __write_once_size include/linux/compiler.h:206 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000009ad4e495 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124 #1: 000000000349cf73 ((work_completion)(&dio->complete_work)){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128 stack backtrace: CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 4.19.0-rc8-next-20181016+ #95 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: dio/sda1 dio_aio_complete_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_circular_bug.isra.35.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1864 [inline] check_prevs_add kernel/locking/lockdep.c:1977 [inline] validate_chain kernel/locking/lockdep.c:2348 [inline] __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3342 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3845 down_write+0x8a/0x130 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:764 [inline] __generic_file_fsync+0xb5/0x200 fs/libfs.c:999 ext4_sync_file+0xa45/0x1500 fs/ext4/fsync.c:120 vfs_fsync_range+0x140/0x220 fs/sync.c:197 generic_write_sync include/linux/fs.h:2776 [inline] dio_complete+0x75c/0x9e0 fs/direct-io.c:329 dio_aio_complete_work+0x20/0x30 fs/direct-io.c:341 process_one_work+0xc8b/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 audit: type=1804 audit(1539691048.645:329): pid=29314 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/709/bus" dev="sda1" ino=16793 res=1 kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000003d41719b): kobject_uevent_env audit: type=1804 audit(1539691048.895:330): pid=29314 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/709/bus" dev="sda1" ino=16793 res=1 kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' audit: type=1804 audit(1539691048.945:331): pid=29316 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/709/bus" dev="sda1" ino=16793 res=1 kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' audit: type=1804 audit(1539691049.235:332): pid=29353 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/710/bus" dev="sda1" ino=16792 res=1 kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1804 audit(1539691049.585:333): pid=29353 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/710/bus" dev="sda1" ino=16792 res=1 audit: type=1804 audit(1539691049.635:334): pid=29356 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/710/bus" dev="sda1" ino=16792 res=1 kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env audit: type=1804 audit(1539691049.915:335): pid=29402 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/711/bus" dev="sda1" ino=16774 res=1 kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'kvm' (00000000cb832808): kobject_uevent_env kobject: 'kvm' (00000000cb832808): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'kvm' (00000000cb832808): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (00000000cb832808): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000cb832808): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'kvm' (00000000cb832808): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000cb832808): kobject_uevent_env kobject: 'kvm' (00000000cb832808): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kauditd_printk_skb: 5 callbacks suppressed audit: type=1804 audit(1539691052.035:341): pid=29544 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/715/bus" dev="sda1" ino=16626 res=1 kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' audit: type=1804 audit(1539691052.285:342): pid=29544 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/715/bus" dev="sda1" ino=16626 res=1 kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1804 audit(1539691052.335:343): pid=29544 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/715/bus" dev="sda1" ino=16626 res=1 kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' audit: type=1804 audit(1539691052.605:344): pid=29577 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/716/bus" dev="sda1" ino=16642 res=1 kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env audit: type=1804 audit(1539691053.335:345): pid=29586 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/716/bus" dev="sda1" ino=16642 res=1 kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' audit: type=1804 audit(1539691053.495:346): pid=29629 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/716/bus" dev="sda1" ino=16642 res=1 REISERFS warning (device loop3): super-6502 reiserfs_getopt: unknown mount option "hash=tea" kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' audit: type=1804 audit(1539691053.785:347): pid=29650 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/717/bus" dev="sda1" ino=16627 res=1 kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env audit: type=1804 audit(1539691054.055:348): pid=29650 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/717/bus" dev="sda1" ino=16627 res=1 kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' audit: type=1804 audit(1539691054.115:349): pid=29650 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/717/bus" dev="sda1" ino=16627 res=1 kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1804 audit(1539691054.385:350): pid=29697 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/718/bus" dev="sda1" ino=16627 res=1 kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000003d41719b): kobject_uevent_env overlayfs: unrecognized mount option "func=BPRM_CHECK" or missing value kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env overlayfs: unrecognized mount option "func=BPRM_CHECK" or missing value kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kauditd_printk_skb: 13 callbacks suppressed audit: type=1804 audit(1539691057.335:364): pid=29899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/723/bus" dev="sda1" ino=16525 res=1 kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' ceph: device name is missing path (no : separator in /dev/sg0) kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000003d7cbd7d): kobject_uevent_env kobject: 'loop5' (000000003d7cbd7d): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000020f33ae7): kobject_uevent_env kobject: 'loop2' (0000000020f33ae7): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000092021daa): kobject_uevent_env kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000c7b421aa): kobject_uevent_env kobject: 'loop4' (00000000c7b421aa): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000092021daa): kobject_uevent_env audit: type=1804 audit(1539691057.605:365): pid=29892 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/723/bus" dev="sda1" ino=16525 res=1 kobject: 'loop0' (0000000092021daa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000874f0bf8): kobject_uevent_env kobject: 'loop1' (00000000874f0bf8): fill_kobj_path: path = '/devices/virtual/block/loop1' audit: type=1804 audit(1539691057.665:366): pid=29907 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor2" name="/root/syzkaller-testdir252511476/syzkaller.X0lV5F/723/bus" dev="sda1" ino=16525 res=1 kobject: 'loop3' (000000003d41719b): kobject_uevent_env kobject: 'loop3' (000000003d41719b): fill_kobj_path: path = '/devices/virtual/block/loop3' --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.