From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97190C31E46 for ; Wed, 12 Jun 2019 20:53:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5ABD5208C2 for ; Wed, 12 Jun 2019 20:53:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388447AbfFLUxH (ORCPT ); Wed, 12 Jun 2019 16:53:07 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:50296 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727992AbfFLUxH (ORCPT ); Wed, 12 Jun 2019 16:53:07 -0400 Received: by mail-io1-f71.google.com with SMTP id m26so13300171ioh.17 for ; Wed, 12 Jun 2019 13:53:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=YBsdv8D7E1Ty0uu7Bg8lmNFZhiJqH52Q0qJzpfU5W4o=; b=qmD1a6diAbqxzMbsSLtlSbNy5Yc7x7MetDrapOka1Ta11Ix0Wc10db+kOoU4ZwtCuU 9h7yRBMLdE/llJApz2eNuVsshg6frXz89sUouTQ/xzAYIhXmna8UqAirir6Mz0wzb0+X +MSDk9j59ak3he9ii8e+LzXR9DRLeEoHb40Yer0CHCKi+1pSmHVsj1GRtLWCwbCJ/BvE jne57YtRm1oueq1z1Tu5EQbeB08N3qtzTXS4zDu6vksdqv02uHibScZLNp+/CGmBPp2n uSO+Uu3238llEPYJK50GwTjeGY6cDFW05ZJf0vnmZWgq754u4i4c/uVyu8tlZwh+FPDN SMog== X-Gm-Message-State: APjAAAXZnxw0R/U5CH3wVz684qTiiTmWWLsInMpgWN5LLV6TqbWUsrDV znWgCDec6qmgyJQl5QUL36faw2+ATeP74iyOdj0OzpodtQ3X X-Google-Smtp-Source: APXvYqzuitS9InGBPzlAzfrFxYdSGNVQ94lDMrNOMZJucaif7L6M7OVxv4aGh3ipFrw0WfecBg7mjuVwMvQnbjJDoVZZA3btnItR MIME-Version: 1.0 X-Received: by 2002:a05:660c:ac8:: with SMTP id k8mr862525itl.147.1560372786518; Wed, 12 Jun 2019 13:53:06 -0700 (PDT) Date: Wed, 12 Jun 2019 13:53:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a861f6058b2699e0@google.com> Subject: INFO: task syz-executor can't die for more than 143 seconds. 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 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 81a72c79 Add linux-next specific files for 20190612 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1451d31ea00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8aa46bbce201b8b6 dashboard link: https://syzkaller.appspot.com/bug?extid=8ab2d0f39fb79fe6ca40 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1250ae3ea00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1568557aa00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8ab2d0f39fb79fe6ca40@syzkaller.appspotmail.com INFO: task syz-executor050:8619 can't die for more than 143 seconds. syz-executor050 R running task 27536 8619 8618 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1046: #0: 00000000f58b83ec (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8504: #0: 00000000b8867a10 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8594: #0: 000000008c94b07f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006c5169d5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8595: #0: 0000000042bd87ed (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009ebc0e1a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8596: #0: 00000000ad647db4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f68a3152 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8597: #0: 0000000072ec45a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000daa58f5f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8598: #0: 000000007698feb5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000017a6b41f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8599: #0: 00000000f5a5df8a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003ed47aa1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8600: #0: 00000000ab9f490c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000332ddba5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor050/8619: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1046 Comm: khungtaskd Not tainted 5.2.0-rc4-next-20190612 #13 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8619 Comm: syz-executor050 Not tainted 5.2.0-rc4-next-20190612 #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:101 Code: f4 ff ff ff e8 9d fa e9 ff 48 c7 05 ce b0 15 09 00 00 00 00 e9 a4 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 c0 fd 01 00 65 8b 15 f0 fa 90 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8880a9acfd80 EFLAGS: 00000206 RAX: 1ffffd40000720d9 RBX: 0000160000000000 RCX: ffffffff81682654 RDX: 0000000000000000 RSI: ffffffff8168263c RDI: ffffea00003906c8 RBP: ffff8880a9acfd80 R08: ffff88808fe146c0 R09: 0000000000000002 R10: ffff88808fe14f78 R11: ffff88808fe146c0 R12: ffffea0000390688 R13: dffffc0000000000 R14: ffffea0000390680 R15: 00000000049a5000 FS: 0000555555a3e880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a3d59000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: page_to_boot_pfn include/linux/kexec.h:325 [inline] kimage_alloc_page+0xac/0x9f0 kernel/kexec_core.c:708 kimage_load_normal_segment kernel/kexec_core.c:802 [inline] kimage_load_segment+0x25d/0x740 kernel/kexec_core.c:919 do_kexec_load+0x41a/0x600 kernel/kexec.c:157 __do_sys_kexec_load kernel/kexec.c:251 [inline] __se_sys_kexec_load kernel/kexec.c:226 [inline] __x64_sys_kexec_load+0x1d5/0x260 kernel/kexec.c:226 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441149 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd407ca1e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441149 RDX: 0000000020000100 RSI: 0000000000000001 RDI: fffffffffffffffe RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401f70 R13: 0000000000402000 R14: 0000000000000000 R15: 0000000000000000 --- 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#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches