[Bug 236333] ThunderX2 fails to boot after r343856

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236333

            Bug ID: 236333
           Summary: ThunderX2 fails to boot after r343856
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: emaste at freebsd.org

Bisected to r343856, boot fails like so:

WARNING: WITNESS option enabled, expect reduced performance.^M
uhub1: 2 ports with 2 removable, self powered^M
uhub0: 2 ports with 2 removable, self powered^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
usbd_setup_device_desc: getting device descriptor at addr 1 failed,
USB_ERR_TIMEOUT^M
usbd_setup_device_desc: getting device descriptor at addr 1 failed,
USB_ERR_TIMEOUT^M
Root mount waiting for: usbus1 usbus0^M
Root mount waiting for: usbus1 usbus0^M
...

Bisect log:
5053141bcbea708eda40c20cc60a120f3a4c87f0 is the first bad commit
commit 5053141bcbea708eda40c20cc60a120f3a4c87f0
Author: jchandra <jchandra at FreeBSD.org>
Date:   Thu Feb 7 03:01:54 2019 +0000

    arm64 gicv3: add IORT and NUMA support

    acpi_iort.c has added support to query GIC proximity and MSI XREF
    ID for GIC ITS blocks. Use this when GIC ITS blocks are initialized
    from ACPI.

    Reviewed by:    andrew
    Differential Revision:  https://reviews.freebsd.org/D18003

:040000 040000 5bbbbc6dd15bad4c55d046e0d3b94079c7295370
e19676bca63f2c01d0f6d9aa427f63e5b7f4edb5 M      sys
$ git bisect log
git bisect start
# bad: [052f129679d4a3d705f9169a70dd53897840473a] Merge remote-tracking branch
'upstream/master' into wipbsd.20181109
git bisect bad 052f129679d4a3d705f9169a70dd53897840473a
# good: [ddd1f1d5f46cda5043027446abd96bcb0b740c84] Revert "Enable PIE by
default in WIPBSD"
git bisect good ddd1f1d5f46cda5043027446abd96bcb0b740c84
# good: [73bcd05fc583be759e391941ac24918430ed021c] Fixes for very early use of
the pthread_mutex_* and libthr malloc.
git bisect good 73bcd05fc583be759e391941ac24918430ed021c
# bad: [4b8675d5ed97289ca72267451f1f2d67631ad30f] Fix a slew of mdoc errors and
warnings.
git bisect bad 4b8675d5ed97289ca72267451f1f2d67631ad30f
# bad: [fea91ac6136ea551592ea77b5a55ecf16e8036b6] Implement pmap_clear_modify()
for RISC-V.
git bisect bad fea91ac6136ea551592ea77b5a55ecf16e8036b6
# bad: [c124a4991351b044aa1412e5a8ce022617843d44] Remove -R option which was
added to sysctl(8) man page per r244106, but it is not implemented.
git bisect bad c124a4991351b044aa1412e5a8ce022617843d44
# bad: [5a66a899d51ffdc2ef3c5d846ff6b7c947dbe2af] pci_host_generic_acpi: use
IORT data for MSI/MSI-X
git bisect bad 5a66a899d51ffdc2ef3c5d846ff6b7c947dbe2af
# good: [c558d0f965f55742092089bf56239b5169e23397] Add quirk for Sansisk X400
drives
git bisect good c558d0f965f55742092089bf56239b5169e23397
# good: [5b96e3b72dd52555255844e6c307c66b0a6ce38c] riscv: default to
non-executable stack
git bisect good 5b96e3b72dd52555255844e6c307c66b0a6ce38c
# good: [47b24738b81eb479e169fe248afda102731a5207] arm64 acpi: Add support for
IORT table
git bisect good 47b24738b81eb479e169fe248afda102731a5207
# bad: [e502a5bda0075bd48250cb86d3452bd0ec84b075] Report cache zones in UMA
stats sysctl, that 'vmstat -z' uses. This should had been part of r251826.
git bisect bad e502a5bda0075bd48250cb86d3452bd0ec84b075
# bad: [5053141bcbea708eda40c20cc60a120f3a4c87f0] arm64 gicv3: add IORT and
NUMA support
git bisect bad 5053141bcbea708eda40c20cc60a120f3a4c87f0
# good: [37387406493e76b36d7ef77b986894db4416502e] Use ifunc to select the
barrier instruction for RDTSC.
git bisect good 37387406493e76b36d7ef77b986894db4416502e
# first bad commit: [5053141bcbea708eda40c20cc60a120f3a4c87f0] arm64 gicv3: add
IORT and NUMA support

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