Hi Justin,
The 32-bit qemu mips runtime tests for -next at kerneltests.org are crashing
for non-SMP builds as follows.
cacheinfo: Failed to find cpu0 device node
cacheinfo: Unable to detect cache hierarchy for CPU 0
CPU 0 Unable to handle kernel paging request at virtual address 00000004, epc ==
8013c6a8, ra == 8013cb54
Oops[#1]:
CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-rc7-next-20170208 #1
Workqueue: events_unbound call_usermodehelper_exec_work
task: 8704a420 task.stack: 87068000
$ 0 : 00000000 80770000 873a8204 8700c214
$ 4 : 00000000 873a8200 00000000 ffff00fe
$ 8 : 8706bfe0 0000a400 fffffffc 8704a459
$12 : 00000000 00000000 00000000 00000720
$16 : 873a8200 87045880 00000000 8700c200
$20 : 87014000 87014005 8700c200 8700c200
$24 : 00000000 8014d1e8
$28 : 87068000 8706be70 87045880 8013cb54
Hi : 00077698
Lo : ab801af8
epc : 8013c6a8 process_one_work+0xd4/0x408
ra : 8013cb54 worker_thread+0x178/0x598
Status: 1000a402 KERNEL EXL
Cause : 0080000c (ExcCode 03)
BadVA : 00000004
PrId : 00019300 (MIPS 24Kc)
Modules linked in:
Process kworker/u2:0 (pid: 5, threadinfo=87068000, task=8704a420, tls=00000000)
Stack : 80700000 8700c214 00000088 80700000 8700c200 8700c200 8700c200 87045898
80700000 8700c214 00000088 80700000 8700c200 8013cb54 8013c9dc 8704fe00
87045600 87045700 80700000 80700000 80700000 80676560 87045600 87045700
87045618 87045880 8013c9dc 8704fe00 80670000 80760000 806e0000 80142958
00000000 00000000 00000000 00000000 80142850 80142850 87045700 8704b380
...
Call Trace:
[<8013c6a8>] process_one_work+0xd4/0x408
[<8013cb54>] worker_thread+0x178/0x598
[<80142958>] kthread+0x108/0x138
[<80105e18>] ret_from_kernel_thread+0x14/0x1c
Code: 8e030008 8e040004 8e150000 <ac830004> 7eb51900 ac640000 ae020004 16400094 ae020008
Bisect points to 'MIPS: Add cacheinfo support'; see below for details.
Reverting this patch fixes te problem.
Configuration is pretty much malta_defconfig with SMP disabled.
I can provide more details if needed.
Thanks,
Guenter
---
# bad: [e3e6c5f3544c5d05c6b3b309a34f4f2c3537e993] Add linux-next specific files for 20170208
# good: [d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c] Linux 4.10-rc7
git bisect start 'HEAD' 'v4.10-rc7'
# bad: [403e468309f9e2b2dbe264be1ad29b1486ed720e] Merge remote-tracking branch 'crypto/master'
git bisect bad 403e468309f9e2b2dbe264be1ad29b1486ed720e
# bad: [44448c3f07a3ae77164de4405fa97baca4f103f5] Merge remote-tracking branch 'hid/for-next'
git bisect bad 44448c3f07a3ae77164de4405fa97baca4f103f5
# good: [dd4318312c6fc5c00ae7619f875fb73538a2c1e6] Merge remote-tracking branch 'omap/for-next'
git bisect good dd4318312c6fc5c00ae7619f875fb73538a2c1e6
# bad: [2fe482530119a6d07acca625b29d527dc22435e6] Merge remote-tracking branch 'powerpc/next'
git bisect bad 2fe482530119a6d07acca625b29d527dc22435e6
# good: [8576190cecf3370ce07ed04178cb3ecbf17dc2d9] Merge remote-tracking branch 'clk/clk-next'
git bisect good 8576190cecf3370ce07ed04178cb3ecbf17dc2d9
# bad: [bf0505dfeac3f7df81b62d9d81987aaef6739ffd] MIPS: Fix special case in 64 bit IP checksumming.
git bisect bad bf0505dfeac3f7df81b62d9d81987aaef6739ffd
# good: [e89ef66d7682f031f026eee6bba03c8c2248d2a9] MIPS: init: Ensure reserved memory regions are not added to bootmem
git bisect good e89ef66d7682f031f026eee6bba03c8c2248d2a9
# bad: [a8b3b0c94ac282628f0668d1366239a3fa72dc9d] MIPS: Netlogic: Fix assembler warning from smpboot.S
git bisect bad a8b3b0c94ac282628f0668d1366239a3fa72dc9d
# bad: [07724712bf22aec5fe44e5d399f115755f436721] MIPS: ralink: Add missing symbol for highmem support.
git bisect bad 07724712bf22aec5fe44e5d399f115755f436721
# good: [856b0f591e951a234d6642cc466023df182eb51c] MIPS: kexec: add debug info about the new kexec'ed image
git bisect good 856b0f591e951a234d6642cc466023df182eb51c
# bad: [2517caf19dbfac3b39f2db5500c5fd03c4370e81] MIPS: ralink: Add missing I2C and I2S clocks.
git bisect bad 2517caf19dbfac3b39f2db5500c5fd03c4370e81
# bad: [ef462f3b64e9fb0c8e1cd5d60f5bd7f13ac2156d] MIPS: Add cacheinfo support
git bisect bad ef462f3b64e9fb0c8e1cd5d60f5bd7f13ac2156d
# good: [0014dea6b71ae3e0384c3358f632b4728c3d432e] MIPS: generic/kexec: add support for a DTB passed in a separate buffer
git bisect good 0014dea6b71ae3e0384c3358f632b4728c3d432e
# first bad commit: [ef462f3b64e9fb0c8e1cd5d60f5bd7f13ac2156d] MIPS: Add cacheinfo support
