Bug 202927 - Regression causes a hang on boot with a Comtrol PCI card
Summary: Regression causes a hang on boot with a Comtrol PCI card
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: PCI (show other bugs)
Hardware: Intel Linux
: P1 normal
Assignee: drivers_pci@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-03-14 20:49 UTC by Jesse Hathaway
Modified: 2019-04-04 15:36 UTC (History)
1 user (show)

See Also:
Kernel Version: 5.0.1
Subsystem:
Regression: No
Bisected commit-id:

Attachments
lspci -vvxxx (331.32 KB, text/plain)
2019-03-14 20:49 UTC, Jesse Hathaway 		Details
lspci -vvxxxx (877.88 KB, text/plain)
2019-03-14 20:50 UTC, Jesse Hathaway 		Details
dmesg output for v5.0.1 vanilla, hangs (57.67 KB, text/plain)
2019-03-14 20:50 UTC, Jesse Hathaway 		Details
dmesg output for v5.0.1 with revert of 1302fcf0d03e & 1c3c5eab1715, works (554.35 KB, text/plain)
2019-03-14 20:51 UTC, Jesse Hathaway 		Details
v5.0.3 initcall_debug (126.10 KB, text/plain)
2019-03-22 19:59 UTC, Jesse Hathaway 		Details
v5.0 initcall_debug with printks (58.25 KB, text/plain)
2019-04-04 15:35 UTC, Jesse Hathaway 		Details
pci-quirks.c (35.94 KB, text/x-csrc)
2019-04-04 15:36 UTC, Jesse Hathaway 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Jesse Hathaway 2019-03-14 20:49:14 UTC 
Created attachment 281831 [details]
lspci -vvxxx

Two regressions cause Linux to hang on boot when a Comtrol PCI card is present.

If I revert the following two commits, I can boot again and the card operates
without issue:

1302fcf0d03e (refs/bisect/bad) PCI: Configure *all* devices, not just
hot-added ones
1c3c5eab1715 sched/core: Enable might_sleep() and smp_processor_id()
checks early

- [x] v3.18 vanilla, 1302fcf0d03e committed, hangs
- [x] v3.18 with revert of 1302fcf0d03e, works
.
.
.
- [x] v4.12 vanilla, hangs
- [x] v4.12 with revert of 1302fcf0d03e, works

- [x] v4.13 vanilla, 1c3c5eab1715 committed, hangs
- [x] v4.13 with revert of 1302fcf0d03e, hangs
- [x] v4.13 with revert of 1c3c5eab1715, hangs
- [x] v4.13 with revert of 1302fcf0d03e & 1c3c5eab1715, works

- [x] v5.0 vanilla, hangs
- [x] v5.0 with revert of 1302fcf0d03e & 1c3c5eab1715, works
Comment 1 Jesse Hathaway 2019-03-14 20:50:04 UTC 
Created attachment 281833 [details]
lspci -vvxxxx
Comment 2 Jesse Hathaway 2019-03-14 20:50:40 UTC 
Created attachment 281835 [details]
dmesg output for v5.0.1 vanilla, hangs
Comment 3 Jesse Hathaway 2019-03-14 20:51:38 UTC 
Created attachment 281837 [details]
dmesg output for v5.0.1 with revert of 1302fcf0d03e & 1c3c5eab1715, works
Comment 4 Jesse Hathaway 2019-03-22 19:59:29 UTC 
Created attachment 281965 [details]
v5.0.3 initcall_debug
Comment 5 Jesse Hathaway 2019-04-04 15:35:20 UTC 
Created attachment 282125 [details]
v5.0 initcall_debug with printks
Comment 6 Jesse Hathaway 2019-04-04 15:36:17 UTC 
Created attachment 282127 [details]
pci-quirks.c
Note You need to log in before you can comment on or make changes to this bug.