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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4183CC433F5 for ; Thu, 14 Oct 2021 02:28:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D5C6610E7 for ; Thu, 14 Oct 2021 02:28:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229496AbhJNCaK (ORCPT ); Wed, 13 Oct 2021 22:30:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229992AbhJNCaK (ORCPT ); Wed, 13 Oct 2021 22:30:10 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09D90C061570; Wed, 13 Oct 2021 19:28:06 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id ls18so3657398pjb.3; Wed, 13 Oct 2021 19:28:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to:cc; bh=kpnlanDVmAbSRkt717gR/dCVidax45ruzhrwKrZGbTY=; b=HOBgXQi0U89P0QwyOKtWlvRG6h52UGFOKlXVLwDYwz5puUlVrbbppb9CoDWmNZMjZv B3EpuGWOtN8Cf67ZBjf9DnCkj8pw3SOZeJiY2H5Ap3CFFq5ugF+0PyUEbImlfctHrzPD 1X+j2vRQ4t36TWmERIw6lytJAwoEMV6vFUgBJHibGWK6PxAOZ5AGhaS4uq+vAn7DiFT6 62EBqPoHTYIUry0C43tiXRGTvYkFwV3l+7N9cdCQGCYNtAmViHk/ThZc4cNtYL90GEZl pUzIvDhkZWxU106/pHZAjro7MI6Tg9wS0DikX20Sjh8rExV+hJ5wibJpNPP4oydVuaTP P5xQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=kpnlanDVmAbSRkt717gR/dCVidax45ruzhrwKrZGbTY=; b=LPt6bSlhW13A1kMcYlPxeML47xCmj1b3pCpCVZUzNHNSBcgyftDpG9cIrftJ60ub4f 7JxzloySUf+QSjCJ2YBbQFeDJraoZ4OxIASvFgxn/cQzD7ywjQRvcabzgpbGSY/jv9br 4hvMLFnZXdWJlbL2H95m97vu3/HG6M+ME8S+rdUw+wq6XOPbOFcJsh3bKEv3AireT4T+ 7Jxa7kChFb/9+wIskNrI4/7tSZ4mMzZYiv+NYmK2SbOV5o+e/y9hwlj9CdgPoCDqEVvD Z97FwOfhPpGrniSJ1/IwZwrhkmGqstt6tjH3rmu5ONteo2KqECAQ+Ts6/FLtGLMKjxXA n6aw== X-Gm-Message-State: AOAM532JPFQft37f/prBvypJzSAz+yOkVSrmh+o4SEaEeQyLo0yvyecA Ax14ppoomRCE2YyGqLDqup2WB2Z5RxFAWJ5lQTfY0+Hu+myz X-Google-Smtp-Source: ABdhPJwrjt5UT3QJM4Axp37g67DE/5z9Eus70nmWaISp3HiTmetIcW7B/+TOgNfmcSfBP/3SO9KbNA4x5xnd6ltBYow= X-Received: by 2002:a17:90b:17ce:: with SMTP id me14mr3373293pjb.112.1634178485348; Wed, 13 Oct 2021 19:28:05 -0700 (PDT) MIME-Version: 1.0 From: Hao Sun Date: Thu, 14 Oct 2021 10:27:54 +0800 Message-ID: Subject: INFO: task hung in io_ring_exit_work To: Pavel Begunkov , Jens Axboe , io-uring@vger.kernel.org Cc: Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 64570fbc14f8 Linux 5.15-rc5 git tree: upstream console output: https://drive.google.com/file/d/1JeHQP3cxmLK6WDSLxyOrUGLDujuTCXeU/view?usp=sharing kernel config: https://drive.google.com/file/d/1em3xgUIMNN_-LUUdySzwN-UDPc3qiiKD/view?usp=sharing Similar report from syzbot: https://syzkaller.appspot.com/bug?id=db58a4022d476752fca3c46386b33ca799d3a7f0 Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun INFO: task kworker/u10:0:24 blocked for more than 143 seconds. Not tainted 5.15.0-rc5 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u10:0 state:D stack:24944 pid: 24 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x5e5/0x890 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x17d/0x280 kernel/sched/completion.c:138 io_ring_exit_work+0x530/0x1550 fs/io_uring.c:9442 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 39 Comm: khungtaskd Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1e1/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xcc8/0x1010 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1-3: NMI backtrace for cpu 1 CPU: 1 PID: 13884 Comm: syz-executor Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:irqentry_enter+0x28/0x50 kernel/entry/common.c:380 Code: 00 00 f6 87 88 00 00 00 03 75 37 65 48 8b 04 25 40 f0 01 00 f6 40 2c 02 48 8b 3c 24 75 0f e8 1f f4 ff ff eb 00 e8 d8 87 49 f8 <31> c0 c3 e8 10 f4 ff ff e8 cb fc ff ff e8 c6 87 49 f8 b8 01 00 00 RSP: 0018:ffffc90009db7db0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888017765580 RDX: 0000000000000000 RSI: ffff888017765580 RDI: 0000000000000002 RBP: ffffc90009db7de8 R08: ffffffff8932db28 R09: 0000000000000000 R10: 0000000000000001 R11: fffffbfff1adb0b2 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000 FS: 00007ff54513e700(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000003 CR3: 00000000149e3000 CR4: 0000000000350ee0 Call Trace: exc_page_fault+0x45/0x180 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x1e6/0x3f0 lib/strncpy_from_user.c:139 Code: 83 eb 08 4d 89 7c 2d 00 bf 07 00 00 00 48 83 c5 08 48 89 de e8 cb 40 7b fd 48 83 fb 07 0f 86 c4 01 00 00 e8 3c 3f 7b fd 31 c0 <4d> 8b 3c 2c 31 ff 89 c6 89 04 24 e8 8a 40 7b fd 8b 04 24 85 c0 0f RSP: 0018:ffffc90009db7e90 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000fe0 RCX: ffff888017765580 RDX: 0000000000000000 RSI: ffff888017765580 RDI: 0000000000000002 RBP: 0000000000000000 R08: ffffffff83fb1f84 R09: 0000000000000007 R10: 0000000000000007 R11: fffff94000862c40 R12: 0000000000000003 R13: ffff88810c589120 R14: 0000000000000fe0 R15: 0000000000000fe3 getname_flags fs/namei.c:149 [inline] getname_flags+0x117/0x5b0 fs/namei.c:128 getname fs/namei.c:217 [inline] __do_sys_rename fs/namei.c:4825 [inline] __se_sys_rename fs/namei.c:4823 [inline] __x64_sys_rename+0x56/0xa0 fs/namei.c:4823 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x2000028a Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 98 4a 2a e9 2c b8 b6 4c 0f 05 00 00 40 00 c4 a3 7b f0 c5 01 41 e2 e9 c4 22 e9 aa bb 3c 00 00 RSP: 002b:00007ff54513dbb8 EFLAGS: 00000203 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000028a RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 RBP: 000000000000008b R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000007 R11: 0000000000000203 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00007ff54513ddc0 NMI backtrace for cpu 2 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 2 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 NMI backtrace for cpu 3 CPU: 3 PID: 3019 Comm: systemd-journal Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0033:0x7ffc3d1c69b5 Code: 00 0f 84 b9 00 00 00 4c 63 cf 49 c1 e1 04 4d 01 c1 45 8b 10 41 f6 c2 01 0f 85 8d 00 00 00 41 8b 40 04 83 f8 01 75 6f 0f 01 f9 <66> 90 48 c1 e2 20 48 09 c2 48 85 d2 78 63 49 8b 48 08 49 8b 41 28 RSP: 002b:00007ffc3d110910 EFLAGS: 00000246 RAX: 000000007fa7dd4e RBX: 0000000000000007 RCX: 0000000000001003 RDX: 0000000000000096 RSI: 00007ffc3d110960 RDI: 0000000000000007 RBP: 00007ffc3d110930 R08: 00007ffc3d1c2080 R09: 00007ffc3d1c20f0 R10: 000000000000dd10 R11: 000000000000011d R12: 00007ffc3d1109a0 R13: 0000000000000001 R14: 0000000000000001 R15: 0005ce1974964533 FS: 00007f9157d9a8c0 GS: 0000000000000000 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: f6 87 88 00 00 00 03 testb $0x3,0x88(%rdi) 9: 75 37 jne 0x42 b: 65 48 8b 04 25 40 f0 mov %gs:0x1f040,%rax 12: 01 00 14: f6 40 2c 02 testb $0x2,0x2c(%rax) 18: 48 8b 3c 24 mov (%rsp),%rdi 1c: 75 0f jne 0x2d 1e: e8 1f f4 ff ff callq 0xfffff442 23: eb 00 jmp 0x25 25: e8 d8 87 49 f8 callq 0xf8498802 * 2a: 31 c0 xor %eax,%eax <-- trapping instruction 2c: c3 retq 2d: e8 10 f4 ff ff callq 0xfffff442 32: e8 cb fc ff ff callq 0xfffffd02 37: e8 c6 87 49 f8 callq 0xf8498802 3c: b8 .byte 0xb8 3d: 01 00 add %eax,(%rax)%