[uml-user] uml crashes with current kernel

[Toralf F. <tor...@gm...>]

Hello,


I'm unsure whether this is the known tty-related signal issue (host kernel is 3.4.4)

Nevertheless today I observed this crash :

Core was generated by `/usr/local/bin/linux-v3.5-rc5-98-g9e85a6f earlyprintk ubda=/home/tfoerste/virtu'.
Program terminated with signal 6, Aborted.
#0  0xb778c424 in __kernel_vsyscall ()
(gdb) bt
#0  0xb778c424 in __kernel_vsyscall ()
#1  0xb76533c6 in kill () at ../sysdeps/unix/syscall-template.S:82
#2  0x080749d5 in uml_abort () at arch/um/os-Linux/util.c:93
#3  0x08074d15 in os_dump_core () at arch/um/os-Linux/util.c:138
#4  0x080628c7 in panic_exit (self=0x83ac518, unused1=0, unused2=0x83cfaa0) at arch/um/kernel/um_arch.c:240
#5  0x0809f2ca in notifier_call_chain (nl=<optimized out>, val=0, v=0x83cfaa0, nr_to_call=-2, nr_calls=0x0)
    at kernel/notifier.c:93
#6  0x0809f413 in __atomic_notifier_call_chain (nr_calls=0x0, nr_to_call=-1, v=0x83cfaa0, val=0, nh=0x83cfa44)
    at kernel/notifier.c:182
#7  atomic_notifier_call_chain (nh=0x83cfa44, val=0, v=0x83cfaa0) at kernel/notifier.c:191
#8  0x083136ce in panic (fmt=0x8371d50 "Kernel mode fault at addr 0x%lx, ip 0x%lx") at kernel/panic.c:120
#9  0x0806248c in segv (fi=<incomplete type>, ip=0, is_user=0, regs=0x83aa5e0) at arch/um/kernel/trap.c:238
#10 0x080625d3 in segv_handler (sig=11, regs=0x83aa5e0) at arch/um/kernel/trap.c:184
#11 0x08073a5d in sig_handler_common (sig=11, mc=0x83aa920) at arch/um/os-Linux/signal.c:43
#12 0x08073bf2 in sig_handler (sig=11, mc=0x83aa920) at arch/um/os-Linux/signal.c:230
#13 0x0807372c in hard_handler (sig=<optimized out>, info=0x83aa88c, p=0x83aa90c) at arch/um/os-Linux/signal.c:164
#14 <signal handler called>
#15 0x00000000 in ?? ()
#16 0x080ca81f in mask_ack_irq (desc=0x83b5240) at kernel/irq/chip.c:234
#17 handle_edge_irq (irq=10, desc=0x83b5240) at kernel/irq/chip.c:493
#18 0x080c7dbe in generic_handle_irq_desc (desc=0x83b5240, irq=10) at include/linux/irqdesc.h:114
#19 generic_handle_irq (irq=10) at kernel/irq/irqdesc.c:314
#20 0x0805f015 in do_IRQ (irq=10, regs=0x83aa9e0) at arch/um/kernel/irq.c:294
#21 0x08062719 in winch (sig=28, regs=0x83aa9e0) at arch/um/kernel/trap.c:285
#22 0x08073a5d in sig_handler_common (sig=28, mc=0x83aad20) at arch/um/os-Linux/signal.c:43
#23 0x08073bf2 in sig_handler (sig=28, mc=0x83aad20) at arch/um/os-Linux/signal.c:230
#24 0x0807372c in hard_handler (sig=<optimized out>, info=0x83aac8c, p=0x83aad0c) at arch/um/os-Linux/signal.c:164
#25 <signal handler called>
#26 0xb778c424 in __kernel_vsyscall ()
#27 0xb76e95b3 in __read_nocancel () at ../sysdeps/unix/syscall-template.S:82
#28 0x08064b51 in read (__nbytes=1, __buf=0x20f82ecb, __fd=20) at /usr/include/bits/unistd.h:45
#29 generic_read (fd=20, c_out=0x20f82ecb "", unused=0x0) at arch/um/drivers/chan_user.c:26
#30 0x080651ba in winch_interrupt (irq=10, data=0x20dffc40) at arch/um/drivers/line.c:731
#31 0x080c842d in handle_irq_event_percpu (desc=0x83b5240, action=0x20dff400) at kernel/irq/handle.c:142
#32 0x080c8567 in handle_irq_event (desc=0x83b5240) at kernel/irq/handle.c:192
#33 0x080ca7df in handle_edge_irq (irq=10, desc=0x83b5240) at kernel/irq/chip.c:519
#34 0x080c7dbe in generic_handle_irq_desc (desc=0x83b5240, irq=10) at include/linux/irqdesc.h:114
#35 generic_handle_irq (irq=10) at kernel/irq/irqdesc.c:314
#36 0x0805f015 in do_IRQ (irq=10, regs=0x20f4de90) at arch/um/kernel/irq.c:294
#37 0x08062719 in winch (sig=28, regs=0x20f4de90) at arch/um/kernel/trap.c:285
#38 0x08076e25 in userspace (regs=0x20f4de90) at arch/um/os-Linux/skas/process.c:442
#39 0x0805fc94 in fork_handler () at arch/um/kernel/process.c:181
#40 0x00000000 in ?? ()

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