[uml-devel] "Kernel panic: Segfault with no mm"

[Lars Marowsky-Bree <lmb@suse.de>]

Hi all,

with the UML kernel on 2.4.21 I am seeing the above. I can trigger it by
a NULL pointer dereference in the kernel (ie, my buggy code / module
;-).

Instead of a regular panic, I get the above. It appears something is
going astray with the mm handling.

#0  panic (fmt=0xa01b8ad2 "Segfault with no mm") at panic.c:59
#1  0xa00af3b4 in segv (address=1074944004, ip=2706132208, is_write=0, 
    is_user=0, sc=0xa1468280) at trap_kern.c:119
#2  0xa00af866 in segv_handler (sig=11, regs=0xa1468280) at trap_user.c:69
#3  0xa00b351c in sig_handler_common_tt (sig=11, sc_ptr=0x58) at trap_user.c:37
#4  0xa00af990 in sig_handler (sig=1, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 43, __dsh = 0, edi = 2694189056, esi = 2694189056, ebp = 2705767004, esp = 2705766988, ebx = 4294967295, edx = 0, ecx = 2705766824, eax = 2706243584, trapno = 13, err = 0, eip = 2706132208, cs = 35, __csh = 0, eflags = 66118, esp_at_signal = 2705766988, ss = 43, __ssh = 0, fpstate = 0x0, oldmask = 436281344, cr2 = 1074944004})
    at trap_user.c:104
#5  <signal handler called>

I wonder whether anyone has seen that before or whether it is something
peculiar to my setup. (Which also includes the aa patches for the VM)


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

-- 
High Availability & Clustering		ever tried. ever failed. no matter.
SuSE Labs				try again. fail again. fail better.
Research & Development, SuSE Linux AG		-- Samuel Beckett



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