Bug 1664380
| Summary: | BUG: scheduling while atomic: kworker/1:1/24117/0x00000002 | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | Daniel Bristot de Oliveira <daolivei> | ||||
| Component: | kernel-rt | Assignee: | Daniel Bristot de Oliveira <daolivei> | ||||
| kernel-rt sub component: | Scheduler | QA Contact: | Tiefu <tieli> | ||||
| Status: | CLOSED ERRATA | Docs Contact: | |||||
| Severity: | medium | ||||||
| Priority: | high | CC: | bhu, core-kernel-mgr, daolivei, lgoncalv, pmatouse, qzhao | ||||
| Version: | 7.7 | ||||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | No Doc Update | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | 1664257 | Environment: | |||||
| Last Closed: | 2019-08-06 12:36:27 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 1655694 | ||||||
| Attachments: |
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Comment 2
Daniel Bristot de Oliveira
2019-01-08 15:45:51 UTC
Created attachment 1527249 [details] padata: Make padata_do_serial() use get_cpu_light() Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1664380 BrewBuild: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=20081122 Internal fix. We hit the following BUG in RHEL8: BUG: scheduling while atomic: kworker/1:1/24117/0x00000002 Preemption disabled at: [<ffffffffb61fd824>] padata_do_serial+0x24/0x110 CPU: 1 PID: 24117 Comm: kworker/1:1 Not tainted 4.18.0-56.rt9.107.el8.x86_64 #1 Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 11/14/2017 Workqueue: pencrypt padata_parallel_worker Call Trace: dump_stack+0x5c/0x80 ? padata_do_serial+0x24/0x110 __schedule_bug.cold.83+0x8e/0x9b __schedule+0x5a0/0x680 schedule+0x39/0xd0 rt_spin_lock_slowlock_locked+0x10e/0x2b0 rt_spin_lock_slowlock+0x50/0x80 padata_do_serial+0x4d/0x110 padata_parallel_worker+0xaf/0xe0 process_one_work+0x183/0x3b0 ? process_one_work+0x3b0/0x3b0 worker_thread+0x30/0x3d0 ? process_one_work+0x3b0/0x3b0 kthread+0x112/0x130 ? kthread_create_worker_on_cpu+0x70/0x70 ret_from_fork+0x35/0x40 and the cause is a spin_lock() taken inside a get_cpu() section. Convert the get/put_cpu to get/put_cpu_light to fix the BUG while reducing the preempt_disable section. As we also have this code on RHEL7, we also need this patch. This patch differs from RHEL8 one because there is only one get_cpu() usage. Signed-off-by: Daniel Bristot de Oliveira <bristot> [Tiefu Li on 15 May 2019] I have done two different ways to verify the bug. Here is the first approach: Step 1.cd /mnt/tests/kernel/distribution/ltp/generic/ltp-full-20190115/testcases/kernel/crypto Step 2. Run the test :./pcrypt_aead01 All passed The second approach is: Step 1.cd /mnt/tests/kernel/distribution/ltp/generic/ Step 2. FILTERTESTS="cve-2017-18075" make run Both of the testing was conducted on 3.10.0-999.rt56.956.el7.x86_64 and kernel-rt-3.10.0-1010.rt56.968.el7.x86_64 respectively. I haven't seen any issue therefore I mark the bug as verified. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2019:2043 |