Re: HEAD/i386 r320212: three reproducible panics

On Friday 30 June 2017 12:44:37 Hans Petter Selasky wrote:

 Hello Hans,

> On 06/30/17 11:01, Oleg V. Nauman wrote:
> > On Friday 23 June 2017 19:42:55 Oleg V. Nauman wrote:
> >>   a) Panic on shutdown:
> >> Fatal trap 1: privileged instruction fault while in kernel mode
> >> cpuid = 1; apic id = 01
> >> instruction pointer  = 0x20:0xc6be2023
> >> stack pointer          = 0x28:0xe13c39f4
> >> frame pointer          = 0x28:0xe13c3a20
> >> code segment      = base 0x0, limit 0xfffff, type 0x1b
> >> 
> >>           = DPL 0, pres 1, def32 1, gran 1
> >> 
> >> processor eflags  = interrupt enabled, resume, IOPL = 0
> >> current process      = 11 (swi1: netisr 0)
> >> trap number    = 1
> >> panic: privileged instruction fault
> >> cpuid = 1
> >> time = 1498206262
> >> Uptime: 6m19s
> >> 
> >>   The trace is:
> >> __curthread () at ./machine/pcpu.h:225
> >> 225      __asm("movl %%fs:%1,%0" : "=r" (td)
> >> (kgdb) #0  __curthread () at ./machine/pcpu.h:225
> >> #1  doadump (textdump=-968633472) at ../../../kern/kern_shutdown.c:318
> >> #2  0xc06e88c4 in kern_reboot (howto=<optimized out>)
> >> 
> >>      at ../../../kern/kern_shutdown.c:386
> >> 
> >> #3  0xc06e8c5b in vpanic (fmt=<optimized out>,
> >> 
> >>      ap=0xe13c3874 "}\334\235\300H\254 \306\001")
> >>      at ../../../kern/kern_shutdown.c:779
> >> 
> >> #4  0xc06e8b1b in panic (fmt=0xc092e18e "%s")
> >> 
> >>      at ../../../kern/kern_shutdown.c:710
> >> 
> >> #5  0xc08eed21 in trap_fatal (frame=0xe13c39b4, eva=<optimized out>)
> >> 
> >>      at ../../../i386/i386/trap.c:978
> >> 
> >> #6  0xc08eea38 in trap (frame=<optimized out>)
> >> 
> >>      at ../../../i386/i386/trap.c:704
> >> 
> >> #7  <signal handler called>
> >> #8  0xc6be2023 in ?? ()
> >> #9  0xc082ed53 in tcp_do_segment (m=<optimized out>, th=<optimized out>,
> >> 
> >>      so=<optimized out>, tp=<optimized out>, drop_hdrlen=<optimized out>,
> >>      tlen=<optimized out>, iptos=<optimized out>,
> >>      ti_locked=<error reading variable: Cannot access memory at address
> >>      0x1>)
> >> 
> >> at ../../../netinet/tcp_input.c:2444
> >> #10 0xc082c181 in tcp_input (mp=<optimized out>, offp=<optimized out>,
> >> 
> >>      proto=<optimized out>) at ../../../netinet/tcp_input.c:1191
> >> 
> >> #11 0xc0820878 in ip_input (m=0x0) at ../../../netinet/ip_input.c:823
> >> #12 0xc07d5d0f in netisr_process_workstream_proto (nwsp=<optimized out>,
> >> 
> >>      proto=<optimized out>) at ../../../net/netisr.c:899
> >> 
> >> #13 swi_net (arg=<optimized out>) at ../../../net/netisr.c:946
> >> #14 0xc06bb3c5 in intr_event_execute_handlers (p=0x109, ie=<optimized
> >> out>)
> >> 
> >>      at ../../../kern/kern_intr.c:1336
> >> 
> >> #15 0xc06bb5f0 in ithread_execute_handlers (ie=<optimized out>,
> >> 
> >>      p=<optimized out>) at ../../../kern/kern_intr.c:1349
> >> 
> >> #16 ithread_loop (arg=0xc60e6d00) at ../../../kern/kern_intr.c:1430
> >> #17 0xc06b8a76 in fork_exit (callout=0xc06bb560 <ithread_loop>,
> >> 
> >>      arg=<optimized out>, frame=<optimized out>)
> >>      at ../../../kern/kern_fork.c:1038
> >> 
> >> #18 <signal handler called>
> >> (kgdb)
> >> 
> >   Interesting enough that panic triggered by named shutdown ( well, 'rndc
> > 
> > flush' is triggering this panic too )
> > 
> >   rndc calling isc__app_ctxrun function and finally panics the system:
> > ---- lib/isc/unix/app.c ---
> > 
> >              return (ISC_R_UNEXPECTED);
> >           
> >           }
> > 
> > #ifndef HAVE_UNIXWARE_SIGWAIT
> > 
> >           result = sigwait(&sset, &sig); <--- panic
> >           if (result == 0) {
> > 
> > ----------------------------
> > 
> > variables are set to:
> >   sset= {__bits = {16387, 0, 0, 0}}
> >   sig = 134533280
> 
> Here:
> 
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220358

 Subscribed && updated.

> 
> Try to turn off hyperthreading to get a more sensible panic.

 Done.

> 
> Migh-t look like an issue with 32-bit systems and iflib.

 I do not know if this related to iflib ; iflib functions were not mentioned 
in backtraces.

> 
> --HPS

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