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 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 39045C12002 for ; Sat, 17 Jul 2021 02:28:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07517613EB for ; Sat, 17 Jul 2021 02:28:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238132AbhGQCbR (ORCPT ); Fri, 16 Jul 2021 22:31:17 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:56250 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230504AbhGQCbQ (ORCPT ); Fri, 16 Jul 2021 22:31:16 -0400 Received: by mail-il1-f200.google.com with SMTP id a15-20020a927f0f0000b02901ac2bdd733dso6500030ild.22 for ; Fri, 16 Jul 2021 19:28:21 -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:in-reply-to:message-id:subject :from:to; bh=cRbh8Tinf77HQCnZXcCsyZQGB7EXM3IOmE6qpom6jko=; b=KwMuk5LQgeMGxf4tfI4YukvQz8Hu+ZZrVbgBiVyOruTQQt+ol16AmOLODOnSL24e6F cooxd6tqdKZF1+A2qSCQoNh8oi/IjrNyvxQCth33dedkAFcOBk1lU2aI54HGeqN5wCMs xIE8P4EERzsTq4U6xEt1Y8cUNkWH02tYDMs+Hzj836R80w9jzF6L0FsgbKby3AfxS3ed T75DMODhr2RgjXjbbXCYCr0Xo7NxMj98OrhAlvhyeN6VMewVxk3QjG0WarJ8ENf/FAWY +ZJnAZWmSZEEmYcJ6SPOvEy3LwqrnpTkvbtLk8UN1jcXOh9Rvznb3I9FaN+Gwfxrp7Bc ESLA== X-Gm-Message-State: AOAM532TwNn4SocFsGgPAKzSB12LVShfZiGDvN89h5JO1C/vsL1pXbE1 wzmXncmMECXu+Fdz0aMfXWh53C6+82WGi+d5aQphlIZn44nH X-Google-Smtp-Source: ABdhPJzOamzTb7oQuNdpVA8renRACbieBVe1TEE1BbdIUI6mcROJK17QTaCNYE7+/qavBzJOpBvCXfnuQxAadIz22xgtsLZmniFi MIME-Version: 1.0 X-Received: by 2002:a05:6e02:ea9:: with SMTP id u9mr8524153ilj.174.1626488900759; Fri, 16 Jul 2021 19:28:20 -0700 (PDT) Date: Fri, 16 Jul 2021 19:28:20 -0700 In-Reply-To: <000000000000295a6a05b65efe35@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000029363505c748757d@google.com> Subject: Re: [syzbot] INFO: task hung in fuse_simple_request From: syzbot To: areeba.ahmed@futuregulfpak.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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