From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 70AE37260A; Fri, 30 Jan 2026 16:59:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769792345; cv=none; b=hT1K+/7X2LPPxJ6cJGpf1nZ0l4PMiJBK9v8E5ejkH1FQDUfc5LjHNS1RBOvPKDmBQ2wwMQiMFBq0VNHjqa1+gi/XcVonTzPznEIJmT6AvR9xDRF0+EBTLOXgKWO58X89aFzSu2bX1LSIhQY6ZWhAwcesbZE76+MG3RFNC4MqtUo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769792345; c=relaxed/simple; bh=cUrkIzDDTezjkboeBKyDgO0TKRNuDY51DVikFFzM37c=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bGSE6H9fZjgaxTcqeydq4ySaCGctfewc9uciT5oBpzb4IqLUC6XCE1rMIE6+g0VoyUgn2PV0sFFfxDeaVuyRKHy4sIWQ+dgV0luWWdUmd349aVsvtWUk6PQ5rGftLMhcVnqQuD+YQqI9jjRoI7ssxUswqjIf04/ba8626SR8esA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bxYbheue; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bxYbheue" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76471C4CEF7; Fri, 30 Jan 2026 16:59:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769792345; bh=cUrkIzDDTezjkboeBKyDgO0TKRNuDY51DVikFFzM37c=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bxYbheueQ4CDJFteeoaGoo6eDu7Tl1YabtkO2Ke7hUQo1oyMc+tWu9Wh5ThCzo5oP F+f7Lz7PuUq8qHxirTI+FYmnf9Y97SWfDC5lNHGVSJQu9On6kkiIGCNsmEzu+4Xpiw S4tzjDBtD4uUOjaf0WEaTie2mGtYNvlrfGgr4nYfLd+RVR+DClzNJVghMbewE03CvS SuDy8sG48SrMLT5SSZfyTJy+pJ3L+IUEMur2ls2WJjl8BwV+U79K9q28vaRQ5FqCfV EY2Z8rGTK/xuN3ABHfkg9nJfEBDpABC6Vqgr95A1vliZsi9HFvBWGIMUIq1AMCH/uh VVqJuWvD4z4UQ== Date: Fri, 30 Jan 2026 17:59:00 +0100 From: Christian Brauner To: kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Jeff Layton , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [linux-next:master] [fs] 313c47f4fe: BUG:kernel_hang_in_test_stage Message-ID: <20260130-badeunfall-flaggen-d4df12bcb501@brauner> References: <202601270735.29b7c33e-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <202601270735.29b7c33e-lkp@intel.com> On Tue, Jan 27, 2026 at 02:26:09PM +0800, kernel test robot wrote: >=20 >=20 > Hello, >=20 > kernel test robot noticed "BUG:kernel_hang_in_test_stage" on: >=20 > commit: 313c47f4fe4d07eb2969f429a66ad331fe2b3b6f ("fs: use nullfs uncondi= tionally as the real rootfs") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master >=20 > [test failed on linux-next/master ca3a02fda4da8e2c1cb6baee5d72352e9e2cfae= a] >=20 > in testcase: trinity > version:=20 > with following parameters: >=20 > runtime: 300s > group: group-00 > nr_groups: 5 >=20 >=20 >=20 > config: x86_64-kexec > compiler: clang-20 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 3= 2G >=20 > (please refer to attached dmesg/kmsg for entire log/backtrace) The reproducer doesn't work: ubuntu@pengar:~/data/kernel/linux/MODULES/lkp-tests$ sudo bin/lkp qemu -k .= =2E/../vmlinux -m ./modules.cgz job-script # job-script result_root: /home/ubuntu/.lkp//result/trinity/group-00-5-300s/vm-snb/yocto= -x86_64-minimal-20190520.cgz/x86_64-kexec/clang-20/313c47f4fe4d07eb2969f429= a66ad331fe2b3b6f/15 downloading initrds ... skip downloading /home/ubuntu/.lkp/cache/osimage/yocto/yocto-x86_64-minimal= -20190520.cgz 19270 blocks /usr/bin/wget -q --timeout=3D3600 --tries=3D1 --local-encoding=3DUTF-8 http= s://download.01.org/0day-ci/lkp-qemu/osimage/pkg/debian-x86_64-20180403.cgz= /trinity-static-x86_64-x86_64-1c734c75-1_2020-01-06.cgz -N -P /home/ubuntu/= =2Elkp/cache/osimage/pkg/debian-x86_64-20180403.cgz Failed to download osimage/pkg/debian-x86_64-20180403.cgz/trinity-static-x8= 6_64-x86_64-1c734c75-1_2020-01-06.cgz cat: '': No such file or directory exec command: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -fsdev local,= id=3Dtest_dev,path=3D/home/ubuntu/.lkp//result/trinity/group-00-5-300s/vm-s= nb/yocto-x86_64-minimal-20190520.cgz/x86_64-kexec/clang-20/313c47f4fe4d07eb= 2969f429a66ad331fe2b3b6f/15,security_model=3Dnone -device virtio-9p-pci,fsd= ev=3Dtest_dev,mount_tag=3D9p/virtfs_mount -kernel ../../vmlinux -append roo= t=3D/dev/ram0 RESULT_ROOT=3D/result/trinity/group-00-5-300s/vm-snb/yocto-x8= 6_64-minimal-20190520.cgz/x86_64-kexec/clang-20/313c47f4fe4d07eb2969f429a66= ad331fe2b3b6f/0 BOOT_IMAGE=3D/pkg/linux/x86_64-kexec/clang-20/313c47f4fe4d0= 7eb2969f429a66ad331fe2b3b6f/vmlinuz-6.19.0-rc1-00006-g313c47f4fe4d branch= =3Dinternal-devel/devel-hourly-20260124-050739 job=3D/lkp/jobs/scheduled/vm= -meta-17/trinity-group-00-5-300s-yocto-x86_64-minimal-20190520.cgz-313c47f4= fe4d-20260126-53110-19zhjsh-2.yaml user=3Dlkp ARCH=3Dx86_64 kconfig=3Dx86_6= 4-kexec commit=3D313c47f4fe4d07eb2969f429a66ad331fe2b3b6f intremap=3Dposted= _msi watchdog_thresh=3D240 rcuperf.shutdown=3D0 rcuscale.shutdown=3D0 refsc= ale.shutdown=3D0 audit=3D0 kunit.enable=3D0 ia32_emulation=3Don max_uptime= =3D7200 LKP_LOCAL_RUN=3D1 selinux=3D0 debug apic=3Ddebug sysrq_always_enabl= ed rcupdate.rcu_cpu_stall_timeout=3D100 net.ifnames=3D0 printk.devkmsg=3Don= panic=3D-1 softlockup_panic=3D1 nmi_watchdog=3Dpanic oops=3Dpanic load_ram= disk=3D2 prompt_ramdisk=3D0 drbd.minor_count=3D8 systemd.log_level=3Derr ig= nore_loglevel console=3Dtty0 earlyprintk=3DttyS0,115200 console=3DttyS0,115= 200 vga=3Dnormal rw ip=3Ddhcp result_service=3D9p/virtfs_mount -initrd /ho= me/ubuntu/.lkp/cache/final_initrd -smp 2 -m 12872M -no-reboot -device i6300= esb -rtc base=3Dlocaltime -device e1000,netdev=3Dnet0 -netdev user,id=3Dnet= 0 -display none -monitor null -serial stdio qemu-system-x86_64: Error loading uncompressed kernel without PVH ELF Note The paths for the downloads in the job script are wrong or don't work. Even if I manually modify the above path I still get in the next step: /usr/bin/wget -q --timeout=3D3600 --tries=3D1 --local-encoding=3DUTF-8 http= s://download.01.org/0day-ci/lkp-qemu/modules.cgz -N -P /home/ubuntu/.lkp/ca= che Failed to download modules.cgz cat: '': No such file or directory I need a way to reproduce the issue to figure out exactly what is happening. >=20 >=20 >=20 > If you fix the issue in a separate patch/commit (i.e. not just a new vers= ion of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-lkp/202601270735.29b7c33e-lkp@intel.= com >=20 >=20 >=20 > [ 27.746952][ T1793] /lkp/lkp/src/monitors/meminfo: line 25: /lkp/lkp/s= rc/bin/event/wait: not found > [ 31.757224][ T1793] /lkp/lkp/src/monitors/oom-killer: line 94: dmesg: = not found > [ 31.757224][ T1793] /lkp/lkp/src/monitors/oom-killer: line 94: grep: n= ot found > [ 31.757224][ T1793] /lkp/lkp/src/monitors/oom-killer: line 25: /lkp/lk= p/src/bin/event/wait: not found > [ 65.744824][ T4974] trinity-main[4974]: segfault at 0 ip 0000000000000= 000 sp 00007ffe08d2ec08 error 15 likely on CPU 0 (core 0, socket 0) > [ 65.746308][ T4974] Code: Unable to access opcode bytes at 0xfffffffff= fffffd6. >=20 > Code starting with the faulting instruction > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > /etc/rc5.d/S77lkp-bootstrap: line 79: sleep: not found > BUG: kernel hang in test stage >=20 >=20 >=20 > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20260127/202601270735.29b7c33e-lk= p@intel.com >=20 >=20 >=20 > --=20 > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >=20