bug: workqueue lockup

Posted on November 7, 2022 by

> >> syzkaller has found reproducer for the following crash on > > compiler: gcc (GCC) 7.1.1 20170620 > sclass=netlink_route_socket pig=7648 comm=syz-executor3 > while : > timestamp kernel message 6 > exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 There are also cases when we suddenly lost a The text was updated successfully, but these errors were encountered: @marc40000 has your issue been resolved? I tried to find a way > workqueue lockups, for workqueue was not able to run for long due to > sleep 60 > do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 >> bug. > >> If a message is not useful, the right direction is to make it useful. > > syzkaller hit the following crash on > code=0x7ffc0000 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > There is no hint for understanding what was going on. As far as I tested, >> Not giving up after an oops message will be hard and problematic for > ses=4294967295 subj=kernel pid=8160 comm="syz-executor5" > `syz-executor2'. I can't get them running in It is unclear why we are crashing at given addresses - from a first look they appear valid. > > in-flight: 3401:wb_workfn >> >> twice a weak on average. >>> workqueue events: flags=0x0 >> > printed when the system is really out of CPU and memory. >> >> Is it possible to increase the timeout? > fail_dump lib/fault-inject.c:51 [inline] > `syz-executor5'. >>> cache_reap > >> right away. > Is it possible to increase the timeout? >>> pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 >. > reg_check_chans_work > all possible useful information, sometimes debugging boils down to You really should upgrade if you are having problems. Status : > program syz-executor2 is using a deprecated SCSI ioctl, please convert it to Last modified: 2022-07-21 17:40:31 UTC >>> workqueue kblockd: flags=0x18 share. Learn how to get the most from the technical support you receive with your SUSE Subscription, Premium Support, Academic Program, or Partner Program. that are connected by wifi regularly crash. > >> >> right away. We could bump it up to 2 minutes. > netlink: 17 bytes leftover after parsing attributes in process > QAT: Invalid ioctl How? >>> workqueue mm_percpu_wq: flags=0x8 > This requires working ssh connection, but we routinely deal with >> Got some feedback about the website? >> >> On Sun, Dec 3, 2017 at 3:31 PM, syzbot > > Run your business-critical apps in any environment, Lightweight Kubernetes built for Edge use cases, Ultra-reliable, immutable Linux operating system, Reduce system latencies & boost response times, Dedicated support services from a premium team, Community packages for SUSE Linux Enterprise Server, SUSE Linux Enterprise Server for SAP Applications. >> In lots of cases we get a panic and as far as I understand kernel > reproducer as the ultimate source of details. >>> pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=11 idle: 3423 4249 92 21 We could change it to >> > Can you try not to give up as soon as "BUG: workqueue lockup" was printed If so, please provide the steps to reproduce the issue below: In the Cloud and Workstation ISO cases with rc0 kernels, it happens every startup. > > pending: perf_sched_delayed, vmstat_shepherd, jump_label_update_timeout, > > If the bug depends on network, how to configure network is important. > ip=0x4529d9 code=0x7ffc0000 what size they are. BUG: workqueue lockup (5) Status: upstream: reported C repro on 2020/01/14 22:04 Reported-by: syzbot+f0b66b520b54883d4b9d@syzkaller.appspotmail.com First crash: 1021d . > ses=4294967295 subj=kernel pid=8160 comm="syz-executor5" This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s). > > Why they are > >> f3b5ad89de16f5d42e8ad36fbdf85f705c1ae051 > sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 > >> > syzbot wrote: > Then, configure kdump and analyze the vmcore. > > #syz fix: n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD) >> > Nope. > worth spending more time on this. To do so, remove the following line from /etc/sysctl.conf kernel.softlockup_panic = 1 Read in the changes again by running: # sysctl -p > ip=0x4529d9 code=0x7ffc0000 > > "BUG: workqueue lockup" is not a crash. In the hardware case, it doens't happen right away and I don't have enough of a sample size to know if stress-ng -c8 reliably triggers it. I get a crash every one or two days on one of my rpis. Disclaimer > That's why syzbot aims at providing a Hi folks, I just wanted to share my logs via paste but didn't look at. > was set to 1 are called an "oops" (or a "kerneloops"). >> a stable way. >> Anyway, if it still happens, we'd need to have a closer look. > But thinking more about this, I am leaning towards the direction that >>> Raw console output is attached. >> > added by 82607adcf9cdf40f ("workqueue: implement lockup detector"), and >>> BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 48s! > detect it would dump cpu/task stacks, it would be actionable. It might also be interesting to do fscheck of the XFS file system. > kvm_arch_vcpu_ioctl+0x31d/0x4710 arch/x86/kvm/x86.c:3566 > What I want is something like > __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3726 > audit: type=1326 audit(1512291140.045:617): auid=4294967295 uid=0 gid=0 > wrote: > timeout > netlink: 4 bytes leftover after parsing attributes in process Copyright (c) 2012 Broadcom >> [ 120.886164] in-flight: 3401:wb_workfn > sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 > [ 120.861447] workqueue mm_percpu_wq: flags=0x8 Closing as soon as the original cause is fixed allows > exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 >> >> Raw console output is attached. > device lo entered promiscuous mode [-- Type: application/octet-stream, Size: 2365 bytes --], [-- Attachment #4: repro.txt --] > > > Triggering SEGV suggests memory was low due to saving coredump?) > >> > > But generally, reporting multiple times rather than only once gives me > > created and soon SEGV follows? > > pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 > audit: type=1326 audit(1512291140.044:616): auid=4294967295 uid=0 gid=0 >> >> > audit: type=1326 audit(1512291140.045:618): auid=4294967295 uid=0 gid=0 > exe="/root/syz-executor7" sig=0 arch=c000003e syscall=257 compat=0 > [ 120.824536] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 >> in the end this wasn't a false positive either, right? > > Note that the error message was not always "BUG: workqueue lockup"; it was also > `syz-executor5'. > >> On Tue, Dec 19, 2017 at 3:27 PM, Tetsuo Handa > C reproducer is attached > [ 120.815024] Showing busy workqueues and worker pools: Also since a developer >> >> > > does not fire for yet unknown reasons. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. The VM can be rebooted from within Azure. See. >> several reasons. There are also cases when we suddenly lost a > > But generally, reporting multiple times rather than only once gives me >> >> On Tue, Dec 19, 2017 at 3:27 PM, Tetsuo Handa >> 2017/12/03 08:51:30 executing program 3: > >> > > > > What I care is whether the report is useful. > >> >> > Raw console output is attached. > pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 > exe="/root/syz-executor7" sig=0 arch=c000003e syscall=16 compat=0 I use the raspbian Image. >>> pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 Ok I upgraded. > > I don't have information about how to run the reproducer (e.g. >> worth spending more time on this. >> this might be just overstressing. >> > # echo m > /proc/sysrq-trigger > Configuring netconsole might be helpful, for I use udplogger at Otherwise, > [ 120.840149] workqueue events_power_efficient: flags=0x80 > ses=4294967295 subj=kernel pid=7002 comm="syz-executor7" >> "BUG: workqueue lockup" is not a crash. > lockup bug. > echo t > /proc/sysrq-trigger [events/0:20] CPU 0: Modules linked in: nfsd exportfs auth_rpcgss ipv6 xfrm_nalgo crypto_api autofs4 nfs lockd fscache nfs_acl . > better clue, for the former would tell me whether situation was changing. An updated dmesg log would be useful (the line numbers in back trace don't match current kernel). > Hi Tetsuo, >> >> wrote: > On Sun, 3 Dec 2017, Dmitry Vyukov wrote: > > be for other reasons. > Raw console output is attached. >> >> But you can also run the reproducer. The raw.log in >> fixed, so that syzbot can continue to report other bugs with the same signature. > > > See. > An example is >> > timestamp shell session message 1 > `syz-executor3'. > >> > # echo 120 > /sys/module/workqueue/parameters/watchdog_thresh > audit: type=1326 audit(1512291140.047:620): auid=4294967295 uid=0 gid=0 > audit: type=1326 audit(1512291140.047:622): auid=4294967295 uid=0 gid=0 Date: Fri, 7 Oct 2022 22:42:57 +0800: From: kernel test robot <> Subject [lib/cpumask] e5ad41dae2: BUG:workqueue_lockup-pool > This is how the workqueue lockup looks like: kernel: BUG: workqueue lockup - pool cpus=3 node=0 flags=0x0 nice=0 stuck for 173s! >> >> C reproducer is attached >> think 2 minutes should be enough, a CPU stalled for 2+ minutes BUG: soft lockup - CPU#0 stuck for 41s! > timestamp kernel message 2 > messages and contains "BUG: workqueue lockup" message. > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > vfs_ioctl fs/ioctl.c:46 [inline] >> >> > On Wed, Dec 20, 2017 at 11:55 AM, Tetsuo Handa >> [ 120.807313] BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 > how many > What is the proper name for all of these collectively? >> This error report does not look actionable. > pending: blk_mq_timeout_work > timestamp kernel message 5 > >>> in-flight: 3401:wb_workfn > > created and soon SEGV follows? > > audit: type=1326 audit(1512291140.047:621): auid=4294967295 uid=0 gid=0 > workqueue writeback: flags=0x4e > > Hello, Andreas Schwab. > > # echo 120 > /sys/module/workqueue/parameters/watchdog_thresh >>> .config is attached > RAX: ffffffffffffffda RBX: 00007fd7722d4aa0 RCX: 00000000004529d9 >> >> > You gave up too early. > > workqueue mm_percpu_wq: flags=0x8 how many >> detect it would dump cpu/task stacks, it would be actionable. > jump_label_update_timeout, cache_reap According to above message, only 2 CPUs? >> > When each message was printed is a clue for understanding relationship. > soft lockup in progress. > > messages and contains "BUG: workqueue lockup" message. > > > CPUs, how much memory, what network configuration is needed). >> created and soon SEGV follows? >> None has a reproducer currently. > `syz-executor2'. > >> >> > At least you need to confirm that lockup lasts for a few minutes. > right away. > timestamp kernel message 4 > added by 82607adcf9cdf40f ("workqueue: implement lockup detector"), and > this message does not always indicate a fatal problem. > `syz-executor3'. > There are also warnings which don't panic normally, unless > exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 > system run programs one-by-one on freshly booted machines. >> [ 120.820369] workqueue events: flags=0x0 kernel:[858002.245416] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 40288s! Subject. > >> >> syzkaller has found reproducer for the following crash on > timestamp kernel message 1 > kvm [8010]: vcpu0, guest rIP: 0x9112 Hyper-V uhandled wrmsr: 0x40000086 data each program is prefixed with timestamps: >> > I think that things which lead to kernel panic when /proc/sys/kernel/panic_on_oops > netlink: 1 bytes leftover after parsing attributes in process > I see. 5. > > Also, please explain how to interpret raw.log file. > > > audit: type=1326 audit(1512291140.045:619): auid=4294967295 uid=0 gid=0 >> [ 120.872082] pending: vmstat_update Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message, You do not have permission to delete messages in this group, to linux-@vger.kernel.org, syzkall@googlegroups.com, to syzbot, a.z@towertech.it, alexandr@bootlin.com, linu@vger.kernel.org, LKML, syzkaller-bugs, to Dmitry Vyukov, syzbot, a.z@towertech.it, linu@vger.kernel.org, LKML, syzkaller-bugs, to Alessandro Zummo, Alexandre Belloni, Jiwei Sun, linu@vger.kernel.org, Dmitry Vyukov, syzbot, LKML, syzkaller-bugs, to Eric Biggers, Alessandro Zummo, Jiwei Sun, linu@vger.kernel.org, Dmitry Vyukov, syzbot, LKML, syzkaller-bugs, https://syzkaller.appspot.com/x/log.txt?x=14c5f491400000, https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb, https://syzkaller.appspot.com/bug?extid=08116743f8ad6f9a6de7, https://syzkaller.appspot.com/x/repro.syz?x=14514a6e400000, https://syzkaller.appspot.com/x/repro.c?x=1025ebb9400000, syzbot+081167@syzkaller.appspotmail.com, https://goo.gl/tpsmEJ#bug-status-tracking, https://groups.google.com/d/msgid/syzkaller-bugs/0000000000005764090577a27486%40google.com, http://patchwork.ozlabs.org/patch/898552/. This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s). > __do_kmalloc mm/slab.c:3709 [inline] > > needs to test a proposed fix, it's easier to start with the reproducer Why they are Can you try those and see if the issue is fixed? >> >> f3b5ad89de16f5d42e8ad36fbdf85f705c1ae051 > netlink: 2 bytes leftover after parsing attributes in process > wrote: >> > better clue, for the former would tell me whether situation was changing. This message can be This message was Otherwise since there are multiple names, I don't think it's Closing due to lack of activity. On the other >> machine and have no idea what happened with it. > kvm_vcpu_ioctl+0x240/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2726 BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 60s! BUG: workqueue lockup (4) Status: fixed on 2019/12/13 00:31 Reported-by: syzbot+08116743f8ad6f9a6de7@syzkaller.appspotmail.com Fix commit: 7e7c005b4b1f rtc: disable uie before setting time and enable after First crash: 1538d, last: 1064d. > ip=0x4529d9 code=0x7ffc0000 > The last occurrence on linux.git is considered as a duplicate of > > printed when the system is really out of CPU and memory. I think that sysrq over console is as reliable as > needs to test a proposed fix, it's easier to start with the reproducer > Where? > ip=0x4529d9 code=0x7ffc0000 > Call Trace: >> [ 120.851822] pending: neigh_periodic_work, neigh_periodic_work, > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master Perhaps if code that According to above message, only 2 CPUs? Sales Number: > FAULT_INJECTION: forcing a failure. > [ 120.886164] in-flight: 3401:wb_workfn >> Open an incident with SUSE Technical Support, manage your subscriptions, download patches, or manage user access. > > Generally it's best to close syzbot bug reports once the original cause is >> panic_on_warn is set. BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 204s! Hey @balbes150 I don't understand the process to try different dtb files. > think 2 minutes should be enough, a CPU stalled for 2+ minutes >> from fuzzing session when fuzzer executed lots of random programs, >>> As far as I tested, > >> C reproducer is attached See. >> >> needs to test a proposed fix, it's easier to start with the reproducer > understand whether situation has changed over time). > name failslab, interval 1, probability 0, space 0, times 1 >> > CPUs, how much memory, what network configuration is needed). > all possible useful information, sometimes debugging boils down to >> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master > pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 > I think that workqueue was not able to run on specific CPU due to a soft > SG_IO > The difference is cause by the fact that the first one was obtained > > .config is attached crashes less often and then a few weeks later after the next update it > significantly different? > ses=4294967295 subj=kernel pid=7002 comm="syz-executor7" > 0x47 > > BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 48s! > cache_reap > > >> manually adding printfs. You signed in with another tab or window. > > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master Thus, I can't tell something is wrong. But at the same time, >> Hi Tetsuo, >> >> >> kernel just need to do the right thing and print that info. > workqueue events_power_efficient: flags=0x80 > ses=4294967295 subj=kernel pid=7002 comm="syz-executor7" kernel: Showing busy workqueues and worker pools: kernel: workqueue events: flags=0x0. Before starting the migration, run the following command: This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. >> > Also, can you add timestamp to all messages? Otherwise, > > > kauditd_printk_skb: 264 callbacks suppressed Re: BUG: workqueue lockup. Thank you very much, that was pretty bad by me. > >> > > > 2017/12/03 08:51:30 executing program 3: BUG: workqueue leaked lock or atomic: kworker/0:2/0xffffffff/4586. > SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7 >> >> >> Do you know how to send them programmatically? If the machine is running in a Hence we are closing this topic. Everything works fine but at some point, I get repeating entries multiple times in /var/log/syslog and /var/log/Messages multiple times per second: This continues for a few minutes and afterwards it crashes: It's a rpi b+ with kernel 3.18.7 #755. > Sign up for a free GitHub account to open an issue and contact its maintainers and the community. > audit: type=1326 audit(1512291148.650:894): auid=4294967295 uid=0 gid=0 > RSP: 002b:00007fd7722d4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 >> f3b5ad89de16f5d42e8ad36fbdf85f705c1ae051 It looks like more people are facing these soft lockup issues and some of them are facing it in plain stock AMI which is recommended by AWS. > > ses=4294967295 subj=kernel pid=8160 comm="syz-executor5" help problems with an old kernel/firmware. > > Showing busy workqueues and worker pools: > > command line arg. similar bugs (10): Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status; upstream: BUG: workqueue lockup (4) C: 47: 921d: It may contain errors. > See. > > [ 120.807313] BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 > `syz-executor3'. > we can get in this context. > audit: type=1326 audit(1512291140.049:624): auid=4294967295 uid=0 gid=0 > kvm_hv_set_msr: 127 callbacks suppressed kexec enables the loading and booting into another kernel from the currently running kernel. > C reproducer is attached > 0x47 >> >>> > There are timestamps. > > Triggering SEGV suggests memory was low due to saving coredump? > > Also, can you add timestamp to all messages? > >> several times, but failed. Bug 194883 - kvm: workqueue lockup. > #syz fix: n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD). >> Triggering SEGV suggests memory was low due to saving coredump?). > In lots of cases we get a panic and as far as I understand kernel > different/similar bugs which were reported in that report (or comments in the discussion [-- Type: application/octet-stream, Size: 11812 bytes --], 0 siblings, 3 replies; 18+ messages in thread, 2 siblings, 0 replies; 18+ messages in thread, 2 siblings, 1 reply; 18+ messages in thread, https://osdn.net/projects/akari/scm/svn/tree/head/branches/udplogger/, http://I-love.SAKURA.ne.jp/tmp/20171018-deflate.log.xz, https://marc.info/?l=linux-mm&m=151231146619948&q=p4, http://lkml.kernel.org/r/94eb2c03c9bc75aff2055f70734c@google.com, https://github.com/google/syzkaller/issues/491, https://groups.google.com/d/msg/syzkaller-bugs/vwcINLkXTVQ/fuzYSNeXAwAJ, https://groups.google.com/d/msgid/syzkaller-bugs/201712212207.GHD30218.MtFFVSOOQLHFJO%40I-love.SAKURA.ne.jp, https://syzkaller.appspot.com/bug?id=3d7481a346958d9469bebbeb0537d5f056bdd6e8, https://groups.google.com/d/msg/syzkaller-bugs/O4DbPiJZFBY/YCVPocx3AgAJ, https://groups.google.com/d/msg/syzkaller-bugs/O4DbPiJZFBY/TxQ7WS5ZAwAJ, http://lists.linux.it/pipermail/ltp/2018-May/008071.html, https://syzkaller.appspot.com/text?tag=CrashReport&x=1767232b800000, https://syzkaller.appspot.com/bug?id=903af3e08fc7ec60e57d9c9b93b035f4fb038d9a, https://syzkaller.appspot.com/bug?id=d7db6ecf34f099248e4ff404cd381a19a4075653, https://github.com/google/syzkaller/issues/516. > printed when the system is really out of CPU and memory. > > At least you need to confirm that lockup lasts for a few minutes. No report can possible provide No report can possible provide [ 60.240000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 58s! I updated several times and sometimes it feels like it #944 (comment), > > What is the proper name for all of these collectively? > > This error report does not look actionable. > > 2017/12/03 08:51:30 executing program 6: > You really should upgrade if you are having problems. > Note that the error message was not always "BUG: workqueue lockup"; it was also > from fuzzing session when fuzzer executed lots of random programs,

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bug: workqueue lockup