Date: Sat, 4 Jun 2022 17:21:11 -0400 From: Michael Butler <imb@protected-networks.net> To: freebsd-current <freebsd-current@freebsd.org> Cc: manu@freebsd.org Subject: commit 99902b1 causes kernel panics Message-ID: <4cff718d-6f0f-bde8-2077-c83f4adc84df@protected-networks.net>
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On a Dell E6430 laptop with an i5-3340M CPU on-board but no additional
video adapter, this commit causes a panic when i915kms is loaded :-(
This adapter does not use any additional firmware.
Reverting only this change allows me to run way past it - up to commit
00b0158d2ca, so far.
All modules were recompiled to match.
/var/crash/core.txt contains ..
Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 03
fault virtual address = 0x19
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff808abe54
stack pointer = 0x0:0xfffffe011920e9b0
frame pointer = 0x0:0xfffffe011920e9b0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 3
current process = 1274 (Xorg)
trap number = 12
panic: page fault
cpuid = 3
time = 1654274788
Uptime: 57s
Dumping 749 out of 16251
MB:..3%..11%..22%..33%..41%..52%..62%..71%..82%..92%
__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
(offsetof(struct pcpu,
(kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1 dump_savectx () at /usr/src/sys/kern/kern_shutdown.c:401
#2 0xffffffff808b0e88 in dumpsys (di=0x0)
at /usr/src/sys/x86/include/dump.h:87
#3 doadump (textdump=<optimized out>)
at /usr/src/sys/kern/kern_shutdown.c:430
#4 kern_reboot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:537
#5 0xffffffff808b12fc in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe011920e810) at
/usr/src/sys/kern/kern_shutdown.c:975
#6 0xffffffff808b1183 in panic (fmt=<unavailable>)
at /usr/src/sys/kern/kern_shutdown.c:899
#7 0xffffffff80c8712c in trap_fatal (frame=frame@entry=0xfffffe011920e8f0,
eva=25) at /usr/src/sys/amd64/amd64/trap.c:942
#8 0xffffffff80c874d6 in trap_pfault (frame=0xfffffe011920e8f0,
usermode=false, signo=<optimized out>, ucode=<optimized out>)
at /usr/src/sys/amd64/include/cpufunc.h:411
#9 <signal handler called>
#10 _rw_wowned (c=0x19) at /usr/src/sys/kern/kern_rwlock.c:270
#11 0xffffffff80bf1a0a in vm_page_busy_acquire (m=0xfffffe0005affec8,
allocflags=allocflags@entry=16) at /usr/src/sys/vm/vm_page.c:888
#12 0xffffffff8271b9a1 in lkpi_vmf_insert_pfn_prot_locked (
vma=0xfffff8015c3bc300, addr=<optimized out>, pfn=<optimized out>,
prot=24) at /usr/src/sys/compat/linuxkpi/common/src/linux_page.c:297
#13 0xffffffff8252d390 in remap_io_mapping () from /boot/modules/i915kms.ko
#14 0xffffffff826449c6 in vm_fault_gtt () from /boot/modules/i915kms.ko
#15 0xffffffff82714e56 in linux_cdev_pager_populate (
vm_obj=0xfffff80154cd1b58, pidx=<optimized out>,
fault_type=<optimized out>, max_prot=<optimized out>,
first=0xfffffe011920ec20, last=0xfffffe011920ec38)
at /usr/src/sys/compat/linuxkpi/common/src/linux_compat.c:692
#16 0xffffffff80bdb732 in vm_pager_populate (object=0x19,
object@entry=0xfffffe011920ebb0, pidx=16, fault_type=1024,
first=0xfffffe011920ec20, last=0xfffffe011920ec38,
max_prot=<optimized out>) at /usr/src/sys/vm/vm_pager.h:182
#17 vm_fault_populate (fs=0xfffffe011920ecc0)
at /usr/src/sys/vm/vm_fault.c:469
#18 vm_fault_allocate (fs=fs@entry=0xfffffe011920ecc0)
at /usr/src/sys/vm/vm_fault.c:1162
#19 0xffffffff80bda47f in vm_fault_object (fs=0xfffffe011920ecc0,
behindp=0xfffffe011920ecb4, aheadp=0xfffffe011920ecbc)
at /usr/src/sys/vm/vm_fault.c:1414
#20 vm_fault (map=map@entry=0xfffffe012b5233f0,
vaddr=vaddr@entry=35550920704, fault_type=fault_type@entry=2 '\002',
fault_flags=fault_flags@entry=0, m_hold=m_hold@entry=0x0)
at /usr/src/sys/vm/vm_fault.c:1549
#21 0xffffffff80bda07d in vm_fault_trap (map=0xfffffe012b5233f0,
vaddr=<optimized out>, fault_type=<optimized out>,
fault_flags=fault_flags@entry=0, signo=0xfffffe011920ef00,
ucode=0xfffffe011920ef04) at /usr/src/sys/vm/vm_fault.c:667
#22 0xffffffff80c87345 in trap_pfault
(frame=frame@entry=0xfffffe011920ef40,
usermode=true, signo=0xfffffe011a70b318,
signo@entry=0xfffffe011920ef00,
ucode=0x3004, ucode@entry=0xfffffe011920ef04)
at /usr/src/sys/amd64/amd64/trap.c:846
#23 0xffffffff80c86a75 in trap (frame=0xfffffe011920ef40)
at /usr/src/sys/amd64/amd64/trap.c:385
#24 <signal handler called>
#25 0x0000000839618c9f in ?? ()
Backtrace stopped: Cannot access memory at address 0x820718370
(kgdb)
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