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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 933B3C4338F for ; Fri, 6 Aug 2021 08:54:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 696A960F70 for ; Fri, 6 Aug 2021 08:54:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243678AbhHFIyd (ORCPT ); Fri, 6 Aug 2021 04:54:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230119AbhHFIyc (ORCPT ); Fri, 6 Aug 2021 04:54:32 -0400 Received: from mail-vs1-xe29.google.com (mail-vs1-xe29.google.com [IPv6:2607:f8b0:4864:20::e29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A604C061798 for ; Fri, 6 Aug 2021 01:54:17 -0700 (PDT) Received: by mail-vs1-xe29.google.com with SMTP id d20so2117187vso.8 for ; Fri, 06 Aug 2021 01:54:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=szeredi.hu; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=1r4sv5KGiIaJyaY9dnyipVULRKV1ikmG9z6racGMlYE=; b=gY5DwPOl/Iu6Bx7gIR+ZP2s2UgSVxcIhf4VuEKWM3FDpmkA0ZZbycf6Yt4DGFALHt7 DPBG5Kwnn37kMDNt8R/GEQN0Wh1tt3fhtYfDTMK18fdm7pcbv3J4tUx0SfEVMyb5DCuL XLp8oxvXJiYtE8foAjBKDi8i6WMiRhuOpECCg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=1r4sv5KGiIaJyaY9dnyipVULRKV1ikmG9z6racGMlYE=; b=i4eNKcrdzLyeGg+i9gyVpBMJnwlt7MIBTLKn87G964yAaQmNealfB/MDbRpE+MFBHd x+GM4dzcFL3bXWYkqsfbDy0sjeAtuAEAA2S3qpmUh0NgUG2GAEuzGObfUp2uiov6zFBM L3wSgBLnhj8SCe9UUKLsS4uUMpuRS9K9vA38KC3vzbzFOuettR0+q03f0s80nUmPikyu SdcomI0uPF+C990h7RDa8uWGsT3qeaw396BDEvCBKqpW+tmW0ClisC6uhZ+gm/+/sCz6 srMiQErpkGJ38GHOTsFDxNI4gHBkuFOchPxcOQ33+m37odVG1h29tkDDG2aucNk9m1n8 ktVQ== X-Gm-Message-State: AOAM533snY+IHkRx549wNM+VkQfe20yRcyf8+e5Kd0MSNzE6aDyIWZ4k YGOUfUrtnB/fQ/f0I3HHzTj6U18IFmudj9eeQkWYMQ== X-Google-Smtp-Source: ABdhPJx4v1L/mwA2+55m/ZTa65I3naXtb0jWzKQuANTe4oLFUCiVvuZz44zUQIjZxzI6EW/cZPnm+2+vIN2yFo8cBc4= X-Received: by 2002:a67:ef96:: with SMTP id r22mr6624861vsp.21.1628240056242; Fri, 06 Aug 2021 01:54:16 -0700 (PDT) MIME-Version: 1.0 References: <000000000000295a6a05b65efe35@google.com> <00000000000029363505c748757d@google.com> In-Reply-To: <00000000000029363505c748757d@google.com> From: Miklos Szeredi Date: Fri, 6 Aug 2021 10:54:05 +0200 Message-ID: Subject: Re: [syzbot] INFO: task hung in fuse_simple_request To: syzbot Cc: syzbot , areeba.ahmed@futuregulfpak.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I'm not sure what to make of this report. Does syzbot try to kill all tasks before generating such a hung task report? Does it use the fuse specific /sys/fs/fuse/connections/*/abort to terminate stuck filesystems? Thanks, Miklos On Sat, 17 Jul 2021 at 04:28, syzbot wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: d936eb238744 Revert "Makefile: Enable -Wimplicit-fallthrou.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1492834a300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=73e52880ded966e4 > dashboard link: https://syzkaller.appspot.com/bug?extid=46fe899420456e014d6b > compiler: Debian clang version 11.0.1-2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165fc902300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1130705c300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+46fe899420456e014d6b@syzkaller.appspotmail.com > > INFO: task syz-executor874:8578 blocked for more than 143 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:26768 pid: 8578 ppid: 8450 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8582 blocked for more than 143 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:25368 pid: 8582 ppid: 8451 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8597 blocked for more than 143 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:24784 pid: 8597 ppid: 8448 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8601 blocked for more than 144 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:24784 pid: 8601 ppid: 8452 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8617 blocked for more than 144 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:26768 pid: 8617 ppid: 8451 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8626 blocked for more than 144 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:24784 pid: 8626 ppid: 8450 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8630 blocked for more than 145 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:24784 pid: 8630 ppid: 8452 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8634 blocked for more than 145 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:26640 pid: 8634 ppid: 8448 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8657 blocked for more than 145 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:26768 pid: 8657 ppid: 8450 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > INFO: task syz-executor874:8665 blocked for more than 145 seconds. > Not tainted 5.14.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor874 state:D stack:26768 pid: 8665 ppid: 8452 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 > schedule+0x14b/0x210 kernel/sched/core.c:6019 > request_wait_answer fs/fuse/dev.c:411 [inline] > __fuse_request_send fs/fuse/dev.c:430 [inline] > fuse_simple_request+0x1125/0x19f0 fs/fuse/dev.c:515 > fuse_do_getattr+0x396/0x1210 fs/fuse/dir.c:1009 > vfs_getattr fs/stat.c:142 [inline] > vfs_statx+0x1ba/0x3d0 fs/stat.c:207 > vfs_fstatat fs/stat.c:225 [inline] > __do_sys_newfstatat fs/stat.c:394 [inline] > __se_sys_newfstatat+0xb4/0x780 fs/stat.c:388 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446039 > RSP: 002b:00007fbb526242f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 > RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000446039 > RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffffffffff9c > RBP: 000000000049b16c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 64695f70756f7267 R14: 65646f6d746f6f72 R15: 00000000004cb4e8 > > Showing all locks held in the system: > 1 lock held by ksoftirqd/0/13: > #0: ffff8880b9c514d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1b/0x30 kernel/sched/core.c:460 > 1 lock held by khungtaskd/1644: > #0: ffffffff8c7177c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 > 1 lock held by in:imklog/8138: > #0: ffff888019edb270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 > no locks held by syz-executor874/16040. > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 PID: 1644 Comm: khungtaskd Not tainted 5.14.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x1d3/0x29f lib/dump_stack.c:105 > nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 > nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xd06/0xd50 kernel/hung_task.c:295 > kthread+0x453/0x480 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 8453 Comm: syz-executor874 Not tainted 5.14.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:put_pid+0x0/0x130 kernel/pid.c:106 > Code: 1f 84 00 00 00 00 00 0f 1f 00 be af 00 00 00 48 c7 c7 40 99 5c 8c e8 ff d4 74 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc <55> 41 57 41 56 41 54 53 49 89 ff e8 c0 a3 2b 00 4d 85 ff 0f 84 aa > RSP: 0018:ffffc9000198fc78 EFLAGS: 00000286 > RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000001 > RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: ffffc9000198fd90 R08: ffffffff81869020 R09: ffffed1002bf8685 > R10: ffffed1002bf8685 R11: 0000000000000000 R12: 0000000000000000 > R13: 1ffff92000331f94 R14: 1ffff92000331f9b R15: 0000000000000000 > FS: 00000000020ba300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbb52603718 CR3: 00000000366ee000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > kernel_wait4+0x27f/0x380 kernel/exit.c:1678 > __do_sys_wait4 kernel/exit.c:1705 [inline] > __se_sys_wait4 kernel/exit.c:1701 [inline] > __x64_sys_wait4+0x117/0x1c0 kernel/exit.c:1701 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x444826 > Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 > RSP: 002b:00007fff50fbe958 EFLAGS: 00000246 ORIG_RAX: 000000000000003d > RAX: ffffffffffffffda RBX: 00007fff50fbea10 RCX: 0000000000444826 > RDX: 0000000040000001 RSI: 00007fff50fbe98c RDI: 00000000ffffffff > RBP: 00007fff50fbe98c R08: 00007fff50fec080 R09: 0000000000000010 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 > R13: 0000000000001eee R14: 00007fff50fbe9e0 R15: 00007fff50fbe9d0 >