[uml-user] linux-v3.4-7644-g07acfc2 core dumped (not reliable)

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Hello,

the current git kernel gave a core dump. The 2nd try to start my user
mode linuc image was fine. Nevertheless it follows the output at the
command line and the back trace.

Hope this helps :-)

...
io scheduler noop registered
io scheduler cfq registered (default)
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <ma...@qu...>
TCP: cubic registered
NET: Registered protocol family 17
Key type dns_resolver registered
initlevel:7=late, 21 registered initcalls
Initialized stdio console driver
Console initialized on /dev/tty0
                                console [tty0] enabled, bootconsole disabled
console [tty0] enabled, bootconsole disabled
                                            Initializing software serial
port version 1
console [mc-1] enabled
 ubda: unknown partition table
 ubdb: unknown partition table
Netdevice 0 (7a:cf:14:11:67:01) :
TUN/TAP backend -
kjournald starting.  Commit interval 5 seconds
EXT3-fs (ubda): mounted filesystem with ordered data mode
VFS: Mounted root (ext3 filesystem) readonly on device 98:0.
Kernel panic - not syncing: Segfault with no mm
0838a4b4:  [<082fc7e8>] dump_stack+0x22/0x24
0838a4cc:  [<082fc866>] panic+0x7c/0x189
0838a4f4:  [<08061509>] segv+0x259/0x2c0
0838a5a4:  [<080615c3>] segv_handler+0x53/0x80
0838a5cc:  [<08072a4d>] sig_handler_common+0x4d/0xc0
0838a848:  [<08072be2>] sig_handler+0x42/0x50
0838a858:  [<0807271c>] hard_handler+0x6c/0xb0
0838a87c:  [<b779f40c>] 0xb779f40c
0838a998:  [<080c628e>] generic_handle_irq+0x2e/0x40
0838a9ac:  [<0805e015>] do_IRQ+0x25/0x40
0838a9bc:  [<08061709>] winch+0x19/0x20
0838a9cc:  [<08072a4d>] sig_handler_common+0x4d/0xc0
0838ac48:  [<08072be2>] sig_handler+0x42/0x50
0838ac58:  [<0807271c>] hard_handler+0x6c/0xb0
0838ac7c:  [<b779f40c>] 0xb779f40c

EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
    Not tainted
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
0838a468:  [<0807926d>] show_regs+0xed/0x120
0838a484:  [<0806189c>] panic_exit+0x2c/0x50
0838a494:  [<0809d8fa>] notifier_call_chain+0x4a/0x70
0838a4bc:  [<0809da43>] atomic_notifier_call_chain+0x23/0x30
0838a4cc:  [<082fc88e>] panic+0xa4/0x189
0838a4f4:  [<08061509>] segv+0x259/0x2c0
0838a5a4:  [<080615c3>] segv_handler+0x53/0x80
0838a5cc:  [<08072a4d>] sig_handler_common+0x4d/0xc0
0838a848:  [<08072be2>] sig_handler+0x42/0x50
0838a858:  [<0807271c>] hard_handler+0x6c/0xb0
0838a87c:  [<b779f40c>] 0xb779f40c
0838a998:  [<080c628e>] generic_handle_irq+0x2e/0x40
0838a9ac:  [<0805e015>] do_IRQ+0x25/0x40
0838a9bc:  [<08061709>] winch+0x19/0x20
0838a9cc:  [<08072a4d>] sig_handler_common+0x4d/0xc0
0838ac48:  [<08072be2>] sig_handler+0x42/0x50
0838ac58:  [<0807271c>] hard_handler+0x6c/0xb0
0838ac7c:  [<b779f40c>] 0xb779f40c

Terminated

And here's the back trace:

(gdb) bt
#0  0xb779f424 in __kernel_vsyscall ()
#1  0xb76663c6 in kill () at ../sysdeps/unix/syscall-template.S:82
#2  0x080739c5 in uml_abort () at arch/um/os-Linux/util.c:93
#3  0x08073d05 in os_dump_core () at arch/um/os-Linux/util.c:138

#4  0x080618b7 in panic_exit (self=0x838c518, unused1=0,
unused2=0x83af3e0) at arch/um/kernel/um_arch.c:240
#5  0x0809d8fa in notifier_call_chain (nl=<optimized out>, val=0,
v=0x83af3e0, nr_to_call=-2, nr_calls=0x0)
    at kernel/notifier.c:93

#6  0x0809da43 in __atomic_notifier_call_chain (nr_calls=0x0,
nr_to_call=-1, v=0x83af3e0, val=0, nh=0x83af380)
    at kernel/notifier.c:182

#7  atomic_notifier_call_chain (nh=0x83af380, val=0, v=0x83af3e0) at
kernel/notifier.c:191
#8  0x082fc88e in panic (fmt=0x8351566 "Segfault with no mm") at
kernel/panic.c:120
#9  0x08061509 in segv (fi=<incomplete type>, ip=0, is_user=0,
regs=0x838a5e0) at arch/um/kernel/trap.c:194
#10 0x080615c3 in segv_handler (sig=11, regs=0x838a5e0) at
arch/um/kernel/trap.c:170
#11 0x08072a4d in sig_handler_common (sig=11, mc=0x838a920) at
arch/um/os-Linux/signal.c:43
#12 0x08072be2 in sig_handler (sig=11, mc=0x838a920) at
arch/um/os-Linux/signal.c:230
#13 0x0807271c in hard_handler (sig=<optimized out>, info=0x838a88c,
p=0x838a90c)
    at arch/um/os-Linux/signal.c:164
#14 <signal handler called>
#15 0x00000000 in ?? ()
#16 0x080c8c8f in mask_ack_irq (desc=0x8395200) at kernel/irq/chip.c:234
#17 handle_edge_irq (irq=10, desc=0x8395200) at kernel/irq/chip.c:489
#18 0x080c628e in generic_handle_irq_desc (desc=0x8395200, irq=10) at
include/linux/irqdesc.h:114
#19 generic_handle_irq (irq=10) at kernel/irq/irqdesc.c:314
#20 0x0805e015 in do_IRQ (irq=10, regs=0x838a9e0) at
arch/um/kernel/irq.c:294
#21 0x08061709 in winch (sig=28, regs=0x838a9e0) at
arch/um/kernel/trap.c:271
#22 0x08072a4d in sig_handler_common (sig=28, mc=0x838ad20) at
arch/um/os-Linux/signal.c:43
#23 0x08072be2 in sig_handler (sig=28, mc=0x838ad20) at
arch/um/os-Linux/signal.c:230
#24 0x0807271c in hard_handler (sig=<optimized out>, info=0x838ac8c,
p=0x838ad0c)
    at arch/um/os-Linux/signal.c:164
#25 <signal handler called>
#26 0xb779f424 in __kernel_vsyscall ()
#27 0xb76d41e0 in __nanosleep_nocancel () at
../sysdeps/unix/syscall-template.S:82
#28 0x08073341 in idle_sleep (nsecs=<optimized out>) at
arch/um/os-Linux/time.c:183
#29 0x0805efab in default_idle () at arch/um/kernel/process.c:254
#30 0x0805eff6 in cpu_idle () at arch/um/kernel/process.c:263
#31 0x082fba8e in rest_init () at init/main.c:384
#32 0x0804969f in start_kernel () at init/main.c:636
#33 0x0804ac66 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:46
#34 0x08071a3e in run_kernel_thread (fn=0x804ac3a <start_kernel_proc>,
arg=0x0, jmp_ptr=0x838ba40)
    at arch/um/os-Linux/process.c:257
#35 0x0805ed25 in new_thread_handler () at arch/um/kernel/process.c:156
#36 0x00000000 in ?? ()

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3