https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194550
Bug ID: 194550
Summary: panic: race condition with epair and atmconfig
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
When epair created fast enough the system got the panic when performing
atmconfig (afexist in /etc/network.subr executed by devd)
Work-around: kill devd process or in the afexists() in /etc/network.subr
prevent atmconfig execution:
-----
atm)
++ return 1
if [ -x /sbin/atmconfig ]; then
/sbin/atmconfig diag list > /dev/null 2>&1
else
return 1
fi
-----
Panic is easy to reproduce via script:
-----
#!/bin/sh
for i in $( seq 0 300 ); do
echo $i
/sbin/ifconfig epair${i} create
[ $? -ne 0 ] && exit 1
done
-----
Significantly accelerate the emergence of panic if run in parallel:
-----
#!/bin/sh
while [ 1 ];do
/sbin/atmconfig diag list
done
-----
KGDB Backtrace:
--
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor read instruction, page not present
instruction pointer = 0x20:0x0
stack pointer = 0x28:0xfffffe007b5857b0
frame pointer = 0x28:0xfffffe007b5857e0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 3008 (atmconfig)
Uptime: 1m47s
Dumping 145 out of 2021 MB:..12%..23%..34%..45%..56%..67%..78%..89%..100%
Reading symbols from /boot/kernel/pf.ko.symbols...done.
Loaded symbols for /boot/kernel/pf.ko.symbols
Reading symbols from /boot/kernel/nullfs.ko.symbols...done.
Loaded symbols for /boot/kernel/nullfs.ko.symbols
Reading symbols from /boot/kernel/fdescfs.ko.symbols...done.
Loaded symbols for /boot/kernel/fdescfs.ko.symbols
Reading symbols from /boot/kernel/if_epair.ko.symbols...done.
Loaded symbols for /boot/kernel/if_epair.ko.symbols
#0 doadump (textdump=1) at pcpu.h:219
219 __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) list
214 static __inline __pure2 struct thread *
215 __curthread(void)
216 {
217 struct thread *td;
218
219 __asm("movq %%gs:%1,%0" : "=r" (td)
220 : "m" (*(char *)OFFSETOF_CURTHREAD));
221 return (td);
222 }
223 #ifdef __clang__
Current language: auto; currently minimal
(kgdb)
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