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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 0BD63C2B9F4 for ; Mon, 28 Jun 2021 05:57:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2426613EF for ; Mon, 28 Jun 2021 05:57:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232161AbhF1F7x (ORCPT ); Mon, 28 Jun 2021 01:59:53 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:47001 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232259AbhF1F7k (ORCPT ); Mon, 28 Jun 2021 01:59:40 -0400 Received: by mail-il1-f200.google.com with SMTP id p12-20020a92d28c0000b02901ee741987a7so4779835ilp.13 for ; Sun, 27 Jun 2021 22:57:15 -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=NZiHOP66CN3/d3r09QWR20u5KTe63dZhDT9GX98ADZE=; b=GpPlEaylUZHrnKcI8jmEmAJRVNwIcF0jrUZxf8eiJo3bsuv6Emae3ymkyAETdjb7fB ALnVuuLUEB/FzGwKa6FcgTLyKOMAZ30SXGW9FYd7HaAd6RFVjiATaYfUjUgdFXFSEnyc MMw/zl6U+fNsyuJ+Gp46MrPzz01FfWhHuMr2z1KgPNbaAzJgTwQDNH5lForVPkO+bVtK jSFtujqRXKAvf1GAR/yb6hl8z95A7Fc+cs9970jIcArMu9BhwBIN1YV/YUTHQ3Km4V1E DSMJ4DNuCoNrs18MulxrS4Kdv66hZWJAewShOl6jWUhJ2+pOMh27g9SuhTP8Ir8QAQIt LO5Q== X-Gm-Message-State: AOAM533nDLorLh41f5FLQQ2fQfuzx7bIt7/WuuwPNTTWNtzhS9VXgImV +pVuuAvoq7WKv+QuLJmp8sC6s+9VydTKkKQ75SPDgCYX+Q14 X-Google-Smtp-Source: ABdhPJyVpCwX1N8AuMDdD5DBKGlQWtCf2XKmIlAljvfGYQzEV66j1fnci6D6i9DyvzjYqPhyRYwdvaPHdX0++rYkrNEepIueusfi MIME-Version: 1.0 X-Received: by 2002:a6b:5c0a:: with SMTP id z10mr19934094ioh.122.1624859834952; Sun, 27 Jun 2021 22:57:14 -0700 (PDT) Date: Sun, 27 Jun 2021 22:57:14 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000045ad9705c5cd29ab@google.com> Subject: [syzbot] INFO: task can't die in p9_client_rpc (3) From: syzbot To: asmadeus@codewreck.org, davem@davemloft.net, ericvh@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, lucho@ionkov.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a1f92694 Add linux-next specific files for 20210518 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10805a64300000 kernel config: https://syzkaller.appspot.com/x/.config?x=d612e75ffd53a6d3 dashboard link: https://syzkaller.appspot.com/bug?extid=716aab0e63b2895e1811 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+716aab0e63b2895e1811@syzkaller.appspotmail.com INFO: task syz-executor.2:17696 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:27376 pid:17696 ppid: 8468 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4688 [inline] __schedule+0xb38/0x58c0 kernel/sched/core.c:5945 schedule+0xcf/0x270 kernel/sched/core.c:6024 p9_client_rpc+0x405/0x1240 net/9p/client.c:759 p9_client_flush+0x1f9/0x430 net/9p/client.c:667 p9_client_rpc+0xfe3/0x1240 net/9p/client.c:784 p9_client_version net/9p/client.c:955 [inline] p9_client_create+0xae1/0x1110 net/9p/client.c:1055 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 do_syscall_64+0x31/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f42a9fe9188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00000000004bfcb9 R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffdec5a8f0f R14: 00007f42a9fe9300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1641: #0: ffffffff8c17afe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 1 lock held by in:imklog/8364: #0: ffff888025c12370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 4 locks held by rs:main Q:Reg/8365: #0: ffff8880b9c35718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:460 #1: ffff8880b9c1f988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x24c/0x670 kernel/sched/psi.c:872 #2: ffff88802e7cf230 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline] #2: ffff88802e7cf230 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x4d0 fs/ext4/file.c:263 #3: ffff88802e7cf4f8 (&ei->i_raw_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:359 [inline] #3: ffff88802e7cf4f8 (&ei->i_raw_lock){+.+.}-{2:2}, at: ext4_do_update_inode fs/ext4/inode.c:5033 [inline] #3: ffff88802e7cf4f8 (&ei->i_raw_lock){+.+.}-{2:2}, at: ext4_mark_iloc_dirty+0x213/0x38d0 fs/ext4/inode.c:5724 2 locks held by agetty/8383: #0: ffff888015b94098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:253 #1: ffffc90000fdc2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 ============================================= --- This report is generated by a bot. 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