Hello,
with a recent kernel (pre-rc1) I realized this crash and wondering
whether it is worth to bisect or if there's already a fix flying around :
tfoerste@n22 ~/devel/linux $ start_uml.sh
Locating the bottom of the address space ... 0x1000
Locating the top of the address space ... 0xc0000000
Core dump limits :
soft - NONE
hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
- /proc/mm...not found: No such file or directory
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
UML running in SKAS0 mode
Adding 20144128 bytes to physical memory to account for exec-shield gap
bootconsole [earlycon0] enabled
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 382652k available
SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:15
Calibrating delay loop... 4707.12 BogoMIPS (lpj=23535616)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Using 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switching to clocksource itimer
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
mconsole (version 2) initialized on /home/tfoerste/.uml/uml/mconsole
Checking host MADV_REMOVE support...OK
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
Registering the id_resolver key type
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 o...@monad.swb.de).
msgmni has been set to 747
io scheduler noop registered
io scheduler cfq registered (default)
EIP: 0073:[<08144be8>] CPU: 0 Not tainted ESP: 007b:20c57f0c EFLAGS: 00210246
Not tainted
EAX: 00000008 EBX: 0838026c ECX: 083a0930 EDX: 00000000
ESI: 00000000 EDI: 0805a0bb EBP: 20c57f3c DS: 007b ES: 007b
0838a8d8: [<0807924d>] show_regs+0xed/0x120
0838a8f4: [<0806154d>] segv+0x24d/0x2c0
0838a9a4: [<08061613>] segv_handler+0x53/0x80
0838a9cc: [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48: [<08072bb2>] sig_handler+0x42/0x50
0838ac58: [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c: [<b781b40c>] 0xb781b40c
Kernel panic - not syncing: Segfault with no mm
0838a8b4: [<082f33bb>] dump_stack+0x22/0x24
0838a8cc: [<082f3420>] panic+0x63/0x170
0838a8f4: [<08061559>] segv+0x259/0x2c0
0838a9a4: [<08061613>] segv_handler+0x53/0x80
0838a9cc: [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48: [<08072bb2>] sig_handler+0x42/0x50
0838ac58: [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c: [<b781b40c>] 0xb781b40c
EIP: 0073:[<b781b424>] CPU: 0 Not tainted ESP: 007b:bfad2d20 EFLAGS: 00200246
Not tainted
EAX: 00000000 EBX: 00006d75 ECX: 00000013 EDX: 00006d75
ESI: 00006d71 EDI: bfad2db4 EBP: bfad2d54 DS: 007b ES: 007b
0838a868: [<0807924d>] show_regs+0xed/0x120
0838a884: [<080618ec>] panic_exit+0x2c/0x50
0838a894: [<0809c3ea>] notifier_call_chain+0x4a/0x70
0838a8bc: [<0809c533>] atomic_notifier_call_chain+0x23/0x30
0838a8cc: [<082f3448>] panic+0x8b/0x170
0838a8f4: [<08061559>] segv+0x259/0x2c0
0838a9a4: [<08061613>] segv_handler+0x53/0x80
0838a9cc: [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48: [<08072bb2>] sig_handler+0x42/0x50
0838ac58: [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c: [<b781b40c>] 0xb781b40c
Terminated
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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