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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 64107C433F5 for ; Tue, 7 Sep 2021 11:50:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C9B360F5E for ; Tue, 7 Sep 2021 11:50:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244887AbhIGLwA (ORCPT ); Tue, 7 Sep 2021 07:52:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241698AbhIGLv7 (ORCPT ); Tue, 7 Sep 2021 07:51:59 -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 33830C061575; Tue, 7 Sep 2021 04:50:53 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id j1so6139194pjv.3; Tue, 07 Sep 2021 04:50:53 -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=FIrH1EHJJlehDiSVoWBZEQSuCL6J7GqsVIIbBMxroX4=; b=PG4CGeFeTMW5GXiGOAma2eSvW85ivsVVB9ki8WO+HkCmUol4C7SMPg0p93sTSrsqFM 6DM7RXllvoP7rA0ux7o7n5Frhaqb9PPqMQmFRYvfqBTGxy2p019KsVN/42vLeWW4V6wI 69TRNMneltaX7p+MzLvY7MzfiqtXqDDunJegObxz4n6mQfj5AlF4ftgwifMJ7JZB/8N/ Ag1fsKkV7bq18PDCb4KJMxk96Kftps8WfkGXQWfjNh7/HXQRXVuaw+hZ0ivNZFXr4iSE Qbzinq/7QP3xxkn0+q/CbiUeOHvqwKAMwRr5VNbEEExzD1R1+/VaEB+k30WhYM8Q0tYM fjZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=FIrH1EHJJlehDiSVoWBZEQSuCL6J7GqsVIIbBMxroX4=; b=aBFB9VXsQRraGQBRFy9cjDJcrEsn5dO1Xx2U7NkVJzQO631pfFWjOvnnCWYDMq5q2D 7ROlVa6zNU4P+Sj0CXJynXxrm7RiVmMnR/ZFAseIUBgIKB0wOR9+Rx+yYeoxkOo4WDw+ w00VSZ4EogAIBtkBwGRNl7OpvGsmX95EoD+6+Gdz2dN2315+Qas5Oz/eJsqQAfI60Zi3 /0DL4GxdTwFBK2c5Wd97Wlo+N1KJYOD9Ze64C2V9PdyMEBov2jSFhdb4uoM2wrPmBKGm Ku4C7YPc7I2dWWpZ4xTBWA/xeYWy6B4jeKC3Uljwz6zDR4EOmuQG6aZnO2MjkRS5HkpO vZYw== X-Gm-Message-State: AOAM532gD1YBsAQxkglWbIrgYcXn8dRBNH9hNaFlF1ojOQTu0beC/f+F rGDBZ5SNRU8oelkP/tzdmRMBJaZjr2HnlUKHgA== X-Google-Smtp-Source: ABdhPJzPtby+EBQ0gTTFPjZzBa3bb74TN9k56WuzF/1iX5m4VtZLYcN0pTK2N089sCorTZkgF6vXOhbe3tDzHNTqbUA= X-Received: by 2002:a17:902:e743:b0:13a:eb0:d124 with SMTP id p3-20020a170902e74300b0013a0eb0d124mr13873114plf.38.1631015452538; Tue, 07 Sep 2021 04:50:52 -0700 (PDT) MIME-Version: 1.0 From: Hao Sun Date: Tue, 7 Sep 2021 19:50:41 +0800 Message-ID: Subject: INFO: task hung in io_uring_cancel_generic To: axboe@kernel.dk, io-uring@vger.kernel.org Cc: Pavel Begunkov , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 7d2a07b76933 Linux 5.14 git tree: upstream console output: https://drive.google.com/file/d/1c8uRooM0TwJiTIwEviOCB4RC-hhOgGHR/view?usp=sharing kernel config: https://drive.google.com/file/d/1XD9WYDViQLSXN7RGwH8AGGDvP9JvOghx/view?usp=sharing Similar report: https://groups.google.com/u/1/g/syzkaller-bugs/c/FvdcTiJIGtY/m/PcXkoenUAAAJ 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 syz-executor:10969 blocked for more than 143 seconds. Not tainted 5.14.0+ #26 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:28528 pid:10969 ppid: 9213 flags:0x00024004 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 io_uring_cancel_generic+0x458/0x740 fs/io_uring.c:9646 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x25c/0x2dd0 kernel/exit.c:780 do_group_exit+0x125/0x340 kernel/exit.c:922 get_signal+0x4d5/0x25a0 kernel/signal.c:2868 arch_do_signal_or_restart+0x2ed/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x192/0x2a0 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4739cd RSP: 002b:00007fb8de229218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000059c0a8 RBP: 000000000059c0a8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0ac R13: 00007ffc3738731f R14: 00007ffc373874c0 R15: 00007fb8de229300 Showing all locks held in the system: 1 lock held by khungtaskd/1674: #0: ffffffff8b97dde0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8129: #0: ffff888016f972f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1674 Comm: khungtaskd Not tainted 5.14.0+ #26 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:105 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 1 to CPUs 0,2-3: NMI backtrace for cpu 2 CPU: 2 PID: 4927 Comm: systemd-journal Not tainted 5.14.0+ #26 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode+0x0/0x40 kernel/kcov.c:163 Code: 48 89 df e8 02 80 47 00 e9 59 fe ff ff 48 8b 7c 24 08 e8 f3 7f 47 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc <65> 8b 05 29 d0 8b 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 RSP: 0018:ffffc90001077d08 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888014fa9d40 RDX: 0000000000000000 RSI: ffff888014fa9d40 RDI: 0000000000000002 RBP: ffff88802cb20000 R08: ffffffff817c1bfe R09: 0000000000000000 R10: 0000000000000005 R11: ffffed100c7e6531 R12: ffff888010e0af00 R13: 0000000000000200 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9028f938c0(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f90256da000 CR3: 00000000193df000 CR4: 0000000000750ee0 PKRU: 55555554 Call Trace: __sanitizer_cov_trace_pc+0x1a/0x40 kernel/kcov.c:197 trace_hardirqs_on+0x6e/0x1c0 kernel/trace/trace_preemptirq.c:44 kasan_quarantine_put+0x11d/0x1c0 mm/kasan/quarantine.c:220 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1628 [inline] slab_free_freelist_hook+0xe1/0x240 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kmem_cache_free+0x8a/0x5c0 mm/slub.c:3229 putname+0x10c/0x150 fs/namei.c:270 do_mkdirat+0x18a/0x2b0 fs/namei.c:3920 __do_sys_mkdir fs/namei.c:3931 [inline] __se_sys_mkdir fs/namei.c:3929 [inline] __x64_sys_mkdir+0x61/0x80 fs/namei.c:3929 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: 0033:0x7f902824f687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffd1a764c18 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffd1a767b30 RCX: 00007f902824f687 RDX: 00007f9028cc0a00 RSI: 00000000000001ed RDI: 00005650418998a0 RBP: 00007ffd1a764c50 R08: 000000000000eec0 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffd1a767b30 R15: 00007ffd1a765140 NMI backtrace for cpu 3 CPU: 3 PID: 15560 Comm: syz-executor Not tainted 5.14.0+ #26 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:memchr+0x2e/0x80 lib/string.c:1070 Code: 48 bd 00 00 00 00 00 fc ff df 53 48 83 ec 18 eb 26 48 8d 5f 01 48 89 f8 48 89 f9 48 c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f 04 <84> c0 75 21 40 3a 73 ff 74 11 48 89 df 48 39 d7 75 d5 48 83 c4 18 RSP: 0018:ffffc90007f7f910 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffffff90212e86 RCX: 0000000000000005 RDX: ffffffff90212e93 RSI: 000000000000000a RDI: ffffffff90212e85 RBP: dffffc0000000000 R08: ffffffff815dff8f R09: 0000000000000000 R10: 0000000000000005 R11: fffff52000feff84 R12: 0000000000000001 R13: dffffc0000000000 R14: 000000000000001b R15: ffffffff90212e78 FS: 00007f917dcd5700(0000) GS:ffff888135d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000005f CR3: 00000001133e5000 CR4: 0000000000750ee0 PKRU: 55555554 Call Trace: memchr include/linux/fortify-string.h:246 [inline] count_lines kernel/printk/printk_ringbuffer.c:1675 [inline] copy_data kernel/printk/printk_ringbuffer.c:1721 [inline] prb_read kernel/printk/printk_ringbuffer.c:1814 [inline] _prb_read_valid+0x3ae/0x6b0 kernel/printk/printk_ringbuffer.c:1880 prb_read_valid_info+0xa7/0xe0 kernel/printk/printk_ringbuffer.c:1963 find_first_fitting_seq+0xfd/0x210 kernel/printk/printk.c:1450 syslog_print_all+0x15a/0x3a0 kernel/printk/printk.c:1590 do_syslog kernel/printk/printk.c:1669 [inline] do_syslog+0x53f/0x650 kernel/printk/printk.c:1632 __do_sys_syslog kernel/printk/printk.c:1747 [inline] __se_sys_syslog kernel/printk/printk.c:1745 [inline] __x64_sys_syslog+0x71/0xb0 kernel/printk/printk.c:1745 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: 0033:0x2000010c Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc 0d 00 00 00 00 00 00 36 e1 06 4a 2a e9 2c b8 b6 4c 0f 05 03 00 00 00 c4 a3 7b f0 c5 01 41 e2 e9 c4 22 e9 aa bb 3c 00 00 RSP: 002b:00007f917dcd50f8 EFLAGS: 00000203 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000010c RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000033 R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000007 R11: 0000000000000203 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00007f917dcd5300 NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 ---------------- Code disassembly (best guess): 0: 48 89 df mov %rbx,%rdi 3: e8 02 80 47 00 callq 0x47800a 8: e9 59 fe ff ff jmpq 0xfffffe66 d: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 12: e8 f3 7f 47 00 callq 0x47800a 17: e9 61 fd ff ff jmpq 0xfffffd7d 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: cc int3 27: cc int3 28: cc int3 29: cc int3 * 2a: 65 8b 05 29 d0 8b 7e mov %gs:0x7e8bd029(%rip),%eax # 0x7e8bd05a <-- trapping instruction 31: 89 c2 mov %eax,%edx 33: 81 e2 00 01 00 00 and $0x100,%edx 39: a9 00 01 ff 00 test $0xff0100,%eax 3e: 74 10 je 0x50%