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Wed, 23 May 2018 15:13:04 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:34155 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934085AbeEWTND (ORCPT ); Wed, 23 May 2018 15:13:03 -0400 X-Google-Smtp-Source: ADUXVKIqEfO/dtKG4CFgI4+EKx6ZaS22D9fpEPuOEIyuReZ7WOPZvWx3KOFgdNpYWtMgouJhm6BIR4LND7upcPX/plDUE0NqP9gF MIME-Version: 1.0 Date: Wed, 23 May 2018 12:13:02 -0700 In-Reply-To: <0000000000006de361056b146dbe@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e588f5056ce452ce@google.com> Subject: Re: INFO: task hung in lock_mount From: syzbot To: dvyukov@google.com, 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 X-Mailing-List: linux-fsdevel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: syzbot has found a reproducer for the following crash on: HEAD commit: a048a07d7f45 powerpc/64s: Add support for a store forwardi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1084cc27800000 kernel config: https://syzkaller.appspot.com/x/.config?x=982e2df1b9e60b02 dashboard link: https://syzkaller.appspot.com/bug?extid=221d75710bde87fa0e97 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=13992a0f800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131a727b800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+221d75710bde87fa0e97@syzkaller.appspotmail.com INFO: task syz-executor694:4903 blocked for more than 120 seconds. Not tainted 4.17.0-rc6+ #63 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor694 D24936 4903 4506 0x00000004 Call Trace: context_switch kernel/sched/core.c:2859 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3501 schedule+0xef/0x430 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x919/0x15d0 kernel/locking/rwsem-xadd.c:565 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:594 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa2/0x120 kernel/locking/rwsem.c:72 namespace_lock fs/namespace.c:1431 [inline] lock_mount+0xdc/0x2e0 fs/namespace.c:2093 do_loopback fs/namespace.c:2221 [inline] do_mount+0xebc/0x3070 fs/namespace.c:2842 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447099 RSP: 002b:00007f0d700b4da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006ddcb4 RCX: 0000000000447099 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000000 RBP: 00000000006ddcb0 R08: 0000000020000200 R09: 0000000000000000 R10: 0000000000003080 R11: 0000000000000246 R12: 0030656c69662f2e R13: 6f7365725f736e64 R14: 70756f7267632f2e R15: 0000000000000007 Showing all locks held in the system: 2 locks held by khungtaskd/892: #0: (ptrval) (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (ptrval) (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: (ptrval) (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4380: #0: (ptrval) (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 2 locks held by getty/4470: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4471: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4472: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4473: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4474: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4475: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4476: #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by syz-executor694/4903: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4901: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4905: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4911: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4913: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4919: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4921: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4928: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4935: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4937: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4939: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 2 locks held by syz-executor694/4941: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 #1: (ptrval) (namespace_sem){++++}, at: namespace_lock fs/namespace.c:1431 [inline] #1: (ptrval) (namespace_sem){++++}, at: lock_mount+0xdc/0x2e0 fs/namespace.c:2093 1 lock held by syz-executor694/4943: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock_shared include/linux/fs.h:723 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1646 2 locks held by syz-executor694/4944: #0: (ptrval) (sb_writers#12){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #0: (ptrval) (sb_writers#12){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: (ptrval) (&sb->s_type->i_mutex_key#15/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] #1: (ptrval) (&sb->s_type->i_mutex_key#15/1){+.+.}, at: filename_create+0x1aa/0x5a0 fs/namei.c:3606 1 lock held by syz-executor694/4945: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 1 lock held by syz-executor694/4947: #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: inode_lock include/linux/fs.h:713 [inline] #0: (ptrval) (&sb->s_type->i_mutex_key#15){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2088 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc6+ #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4901 Comm: syz-executor694 Not tainted 4.17.0-rc6+ #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_release kernel/locking/lockdep.c:3674 [inline] RIP: 0010:lock_release+0x1f5/0xa10 kernel/locking/lockdep.c:3939 RSP: 0018:ffff8801afca7708 EFLAGS: 00000097 RAX: 0000000000000003 RBX: 1ffff10035f94ee6 RCX: ffffffff815e1551 RDX: 0000000000000004 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8801afca7838 R08: 0000000000000000 R09: ffffed00351966c8 R10: ffffed00351966c8 R11: ffff8801a8cb3643 R12: ffff8801afca7810 R13: ffff8801a8cb3658 R14: ffff8801a9a003c0 R15: ffff8801afca7750 FS: 00007f0d700f7700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d05cc000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:350 [inline] lockref_get+0x42/0x50 lib/lockref.c:51 dget include/linux/dcache.h:326 [inline] mnt_set_mountpoint+0xe7/0x360 fs/namespace.c:914 propagate_one+0x5a7/0x910 fs/pnode.c:269 propagate_mnt+0x18a/0x3e0 fs/pnode.c:315 attach_recursive_mnt+0x5f8/0xb50 fs/namespace.c:2033 graft_tree+0x1aa/0x240 fs/namespace.c:2133 do_add_mount+0x1fe/0x370 fs/namespace.c:2491 do_new_mount fs/namespace.c:2532 [inline] do_mount+0x18e6/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447099 RSP: 002b:00007f0d700f6da8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006ddc84 RCX: 0000000000447099 RDX: 00000000200001c0 RSI: 0000000020026ff8 RDI: 000000002000a000 RBP: 00000000006ddc80 R08: 00000000200007c0 R09: 0000000000000000 R10: 0000000000000080 R11: 0000000000000293 R12: 0030656c69662f2e R13: 6f7365725f736e64 R14: 70756f7267632f2e R15: 0000000000000007 Code: c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 65 4c 8b 34 25 40 ee 01 00 38 d0 7c 08 84 d2 0f 85 67 06 00 00 8b 3d fb bd ac 07 <85> ff 0f 84 41 02 00 00 49 8d 86 30 08 00 00 48 89 c2 48 89 85