This is still related to investigate an issue with a hanging UML/crashing UML
(32 bit Gentoo Linux as host and guest).
The following output was derived from the gdb - does it contain any helpful
information ?
The host kernel is 3.7.1, the guest ran a linux-v3.7-9431-gfa4c95b kernel
0x0805f27c in from_irq_stack (nested=0) at arch/um/kernel/irq.c:462
462 current->stack = to;
(gdb) cont
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0805f27c in from_irq_stack (nested=0) at arch/um/kernel/irq.c:462
462 current->stack = to;
(gdb) bt
#0 0x0805f27c in from_irq_stack (nested=0) at arch/um/kernel/irq.c:462
#1 0x080717dd in hard_handler (sig=<optimized out>, si=0x83fdb0c
<cpu0_irqstack+2828>,
p=0x83fdb8c <cpu0_irqstack+2956>) at arch/um/os-Linux/signal.c:175
#2 <signal handler called>
#3 get_symbol_pos (addr=134759829, symbolsize=0x383e9170, offset=0x383e916c)
at kernel/kallsyms.c:219
#4 0x080b728e in kallsyms_lookup (addr=134759829, symbolsize=0x383e9170,
offset=0x383e916c,
modname=0x383e9168, namebuf=0x383e91a1 "") at kernel/kallsyms.c:295
#5 0x080b7327 in __sprint_symbol (buffer=0x383e91a1 "", address=134759829,
symbol_offset=0,
add_offset=1) at kernel/kallsyms.c:354
#6 0x080b74da in sprint_symbol (buffer=0x383e91a1 "", address=134759829) at
kernel/kallsyms.c:385
#7 0x082677d7 in symbol_string (buf=0x84c8343 <textbuf.25117+35> "---\n",
end=0x84c8700 <cont> "Netdevice 0 (72:ef:3d:35:64:64) : xes 6 to 9)e...No,
enabling workaround",
ptr=<optimized out>, ext=83 'S', spec=...) at lib/vsprintf.c:537
#8 0x0826814d in pointer (fmt=<optimized out>, buf=0x84c8343
<textbuf.25117+35> "---\n",
end=<optimized out>, ptr=0x8084595 <local_bh_enable+69>, spec=...) at
lib/vsprintf.c:1054
#9 0x08267f1a in vsnprintf (
buf=0x84c8320 <textbuf.25117> "\001\064WARNING: at kernel/softirq.c:160
---\n", size=992,
fmt=0x83aec3a "pS()\n", args=0x383e93a0 "\225E\b\b") at lib/vsprintf.c:1442
#10 0x08268467 in vscnprintf (
buf=0x84c8320 <textbuf.25117> "\001\064WARNING: at kernel/softirq.c:160
---\n", size=992,
fmt=0x83aec25 "\001\064WARNING: at %s:%d %pS()\n", args=0x383e9394
"\034\355:\b\240")
at lib/vsprintf.c:1548
#11 0x0807eff8 in vprintk_emit (facility=0, level=-1, dict=0x0, dictlen=0,
fmt=0x83aec25 "\001\064WARNING: at %s:%d %pS()\n", args=0x383e9394
"\034\355:\b\240")
at kernel/printk.c:1545
#12 0x0833a37d in printk (fmt=0x83aec25 "\001\064WARNING: at %s:%d %pS()\n") at
kernel/printk.c:1687
#13 0x0807d630 in warn_slowpath_common (file=0x83aed1c "kernel/softirq.c",
line=160,
caller=<optimized out>, taint=9, args=0x0) at kernel/panic.c:413
---Type <return> to continue, or q <return> to quit---
#14 0x0807d713 in warn_slowpath_null (file=0x83aed1c "kernel/softirq.c",
line=160)
at kernel/panic.c:454
#15 0x08084595 in _local_bh_enable_ip (ip=<optimized out>) at
kernel/softirq.c:160
#16 local_bh_enable () at kernel/softirq.c:187
#17 0x082aa680 in rcu_read_unlock_bh () at include/linux/rcupdate.h:827
#18 dev_queue_xmit (skb=0x381c6e40) at net/core/dev.c:2735
#19 0x082ccaa2 in neigh_hh_output (skb=<optimized out>, hh=<optimized out>)
at include/net/neighbour.h:356
#20 dst_neigh_output (skb=0x381c6e40, n=0x3841d900, dst=<optimized out>) at
include/net/dst.h:412
#21 ip_finish_output2 (skb=0x381c6e40) at net/ipv4/ip_output.c:201
#22 ip_finish_output (skb=<optimized out>) at net/ipv4/ip_output.c:234
#23 0x082ccb43 in ip_output (skb=0x381c6e40) at net/ipv4/ip_output.c:307
#24 0x082cbb23 in dst_output (skb=0x381c6e40) at include/net/dst.h:449
#25 ip_local_out (skb=0x381c6e40) at net/ipv4/ip_output.c:110
#26 0x082cbcce in ip_build_and_send_pkt (skb=0x381c6e40, sk=0x382b0a00,
saddr=1090562240,
daddr=4261456064, opt=0x0) at net/ipv4/ip_output.c:162
#27 0x082e874a in tcp_v4_conn_request (sk=0x382b0a00, skb=0x381c6780) at
net/ipv4/tcp_ipv4.c:1646
#28 0x082df88c in tcp_rcv_state_process (sk=0x382b0a00, skb=0x381c6780,
th=0x38269562, len=40)
at net/ipv4/tcp_input.c:5942
#29 0x082e6577 in tcp_v4_do_rcv (sk=0x382b0a00, skb=0x381c6780) at
net/ipv4/tcp_ipv4.c:1890
#30 0x082e90fe in tcp_v4_rcv (skb=0x381c6780) at net/ipv4/tcp_ipv4.c:2030
#31 0x082c82be in ip_local_deliver_finish (skb=0x381c6780) at
net/ipv4/ip_input.c:225
#32 ip_local_deliver (skb=0x381c6780) at net/ipv4/ip_input.c:263
#33 0x082c87ca in dst_input (skb=0x381c6780) at include/net/dst.h:455
#34 ip_rcv_finish (skb=0x381c6780) at net/ipv4/ip_input.c:373
#35 ip_rcv (skb=<optimized out>, dev=0x380f2000, pt=0x841fcc0 <ip_packet_type>,
orig_dev=0x380f2000)
at net/ipv4/ip_input.c:451
#36 0x082a7c70 in __netif_receive_skb (skb=0x381c6780) at net/core/dev.c:3456
#37 0x082a7d39 in process_backlog (napi=0x8422600 <softnet_data+64>, quota=1)
at net/core/dev.c:3925
---Type <return> to continue, or q <return> to quit---
#38 0x082ab412 in net_rx_action (h=0x84c8fcc <softirq_vec+12>) at
net/core/dev.c:4083
#39 0x080843d2 in __do_softirq () at kernel/softirq.c:247
#40 0x08084536 in do_softirq () at kernel/softirq.c:295
#41 0x0808473d in invoke_softirq () at kernel/softirq.c:329
#42 irq_exit () at kernel/softirq.c:348
#43 0x0805ee8a in do_IRQ (irq=5, regs=0x383e9820) at arch/um/kernel/irq.c:295
#44 0x0805ef05 in sigio_handler (sig=29, unused_si=0x0, regs=0x383e9820) at
arch/um/kernel/irq.c:53
#45 0x08071b28 in sig_handler_common (sig=29, si=0x0, mc=0x0) at
arch/um/os-Linux/signal.c:44
#46 0x08071a4b in unblock_signals () at arch/um/os-Linux/signal.c:282
#47 0x08071bce in set_signals (enable=1) at arch/um/os-Linux/signal.c:302
#48 0x0808453e in arch_local_irq_restore (flags=1)
at /home/tfoerste/devel/linux/arch/um/include/asm/irqflags.h:16
#49 do_softirq () at kernel/softirq.c:297
#50 0x080845d7 in _local_bh_enable_ip (ip=<optimized out>) at
kernel/softirq.c:176
#51 local_bh_enable () at kernel/softirq.c:187
#52 0x082ccac4 in rcu_read_unlock_bh () at include/linux/rcupdate.h:827
#53 ip_finish_output2 (skb=0x3817b0b0) at net/ipv4/ip_output.c:203
#54 ip_finish_output (skb=<optimized out>) at net/ipv4/ip_output.c:234
#55 0x082ccb43 in ip_output (skb=0x3817b0b0) at net/ipv4/ip_output.c:307
#56 0x082cbb23 in dst_output (skb=0x3817b0b0) at include/net/dst.h:449
#57 ip_local_out (skb=0x3817b0b0) at net/ipv4/ip_output.c:110
#58 0x082cbfdd in ip_queue_xmit (skb=0x3817b0b0, fl=0x382b15c8) at
net/ipv4/ip_output.c:403
#59 0x082e1e77 in tcp_transmit_skb (sk=0x382b1400, skb=0x3817b0b0,
clone_it=<optimized out>,
gfp_mask=32) at net/ipv4/tcp_output.c:1106
#60 0x082e288c in tcp_write_xmit (sk=0x382b1400, mss_now=1448, nonagle=1,
push_one=0, gfp=32)
at net/ipv4/tcp_output.c:2029
#61 0x082e2a68 in __tcp_push_pending_frames (sk=0x382b1400, cur_mss=1448,
nonagle=1)
at net/ipv4/tcp_output.c:2068
#62 0x082d4474 in tcp_push (nonagle=<optimized out>, mss_now=1448, flags=64,
sk=0x382b1400)
---Type <return> to continue, or q <return> to quit---
at net/ipv4/tcp.c:636
#63 tcp_sendmsg (iocb=0x383e9d68, sk=0x382b1400, msg=0x383e9d20, size=826) at
net/ipv4/tcp.c:1225
#64 0x082f75b3 in inet_sendmsg (iocb=0x383e9d68, sock=0x37cea900,
msg=0x383e9d20, size=826)
at net/ipv4/af_inet.c:784
#65 0x082980ec in __sock_sendmsg_nosec (size=<optimized out>, msg=0x383e9d20,
sock=0x37cea900,
iocb=0x383e9d68) at net/socket.c:628
#66 __sock_sendmsg (size=<optimized out>, msg=0x383e9d20, sock=0x37cea900,
iocb=0x383e9d68)
at net/socket.c:636
#67 do_sock_write (nr_segs=2, iov=0x383e9e18, iocb=0x383e9d68, msg=0x383e9d20,
file=<optimized out>)
at net/socket.c:974
#68 sock_aio_write (iocb=0x383e9d68, iov=0x383e9e18, nr_segs=2, pos=0) at
net/socket.c:989
#69 0x081002f6 in do_sync_readv_writev (filp=0x3838a080, iov=0x383e9e18,
nr_segs=2, len=826,
ppos=0x383e9e94, fn=0x8297fd0 <sock_aio_write>) at fs/read_write.c:572
#70 0x081005bf in do_readv_writev (type=1, file=0x3838a080, uvector=<optimized
out>, nr_segs=2,
pos=0x383e9e94) at fs/read_write.c:730
#71 0x08100763 in vfs_writev (file=0x3838a080, vec=0x4b448bd0, vlen=2,
pos=0x383e9e94)
at fs/read_write.c:768
#72 0x08100870 in sys_writev (fd=13, vec=0x4b448bd0, vlen=2) at
fs/read_write.c:800
#73 0x08062b22 in handle_syscall (r=0x383ccd50) at
arch/um/kernel/skas/syscall.c:35
#74 0x08074f6d in handle_trap (local_using_sysemu=<optimized out>,
regs=0x383ccd50, pid=10301)
at arch/um/os-Linux/skas/process.c:193
#75 userspace (regs=0x383ccd50) at arch/um/os-Linux/skas/process.c:426
#76 0x0805f7fc in fork_handler () at arch/um/kernel/process.c:160
#77 0x00000002 in ?? ()
(
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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