The following data I gathered from a UML process running at 100% COU of 1 core :
Is something of those data are helpful ?
0x0805f2aa in to_irq_stack (mask_out=0x83d7b28) at arch/um/kernel/irq.c:439
439 task = cpu_tasks[ti->cpu].task;
(gdb) cont
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0805f2aa in to_irq_stack (mask_out=0x83d7b28) at arch/um/kernel/irq.c:439
439 task = cpu_tasks[ti->cpu].task;
(gdb) bt
#0 0x0805f2aa in to_irq_stack (mask_out=0x83d7b28) at arch/um/kernel/irq.c:439
#1 0x080737fb in hard_handler (sig=<optimized out>, si=0x83d7b4c, p=0x83d7bcc)
at arch/um/os-Linux/signal.c:155
#2 <signal handler called>
#3 0x08286867 in __kfree_skb (skb=0x37fa1240) at net/core/skbuff.c:614
#4 0x08286710 in kfree_skb (skb=0x37fa1240) at net/core/skbuff.c:633
#5 0x08068ce8 in uml_net_rx (dev=0x37cc2000) at arch/um/drivers/net_kern.c:104
#6 0x0806975f in uml_net_interrupt (irq=5, dev_id=0x37cc2000) at
arch/um/drivers/net_kern.c:125
#7 0x080c9edd in handle_irq_event_percpu (desc=0x83e21f0, action=0x37fe5880)
at kernel/irq/handle.c:142
#8 0x080ca017 in handle_irq_event (desc=0x83e21f0) at kernel/irq/handle.c:191
#9 0x080cc2ef in handle_edge_irq (irq=5, desc=0x83e21f0) at
kernel/irq/chip.c:519
#10 0x080c9888 in generic_handle_irq_desc (desc=<optimized out>, irq=5) at
include/linux/irqdesc.h:111
#11 generic_handle_irq (irq=5) at kernel/irq/irqdesc.c:314
#12 0x0805ef35 in do_IRQ (irq=5, regs=0x3716a0f8) at arch/um/kernel/irq.c:294
#13 0x0805efab in sigio_handler (sig=29, unused_si=0x0, regs=0x3716a0f8) at
arch/um/kernel/irq.c:53
#14 0x08073b77 in sig_handler_common (sig=29, si=0x0, mc=0x0) at
arch/um/os-Linux/signal.c:44
#15 0x08073b00 in unblock_signals () at arch/um/os-Linux/signal.c:282
#16 0x08073c90 in set_signals (enable=1) at arch/um/os-Linux/signal.c:302
#17 0x0807ffe5 in arch_local_irq_restore (flags=1) at
/home/tfoerste/devel/linux/arch/um/include/asm/irqflags.h:16
#18 vprintk_emit (facility=0, level=<optimized out>, dict=0x0, dictlen=0,
fmt=0x838ba23 "\001\064WARNING: at %s:%d %pS()\n", args=0x3716a3e0
"*\273\070\b\240")
at kernel/printk.c:1619
#19 0x0832310b in printk (fmt=0x838ba23 "\001\064WARNING: at %s:%d %pS()\n") at
kernel/printk.c:1681
#20 0x0807e470 in warn_slowpath_common (file=0x838bb2a "kernel/softirq.c",
line=160, caller=<optimized out>, taint=9, args=0x0) at kernel/panic.c:413
#21 0x0807e563 in warn_slowpath_null (file=0x838bb2a "kernel/softirq.c",
line=160) at kernel/panic.c:454
#22 0x08085b9f in _local_bh_enable_ip (ip=<optimized out>) at
kernel/softirq.c:160
#23 local_bh_enable () at kernel/softirq.c:187
#24 0x08291998 in rcu_read_unlock_bh () at include/linux/rcupdate.h:802
#25 dev_queue_xmit (skb=0x37fa13c0) at net/core/dev.c:2637
#26 0x0829d5f2 in neigh_resolve_output (neigh=0x37e97800, skb=0x37fa13c0) at
net/core/neighbour.c:1320
#27 0x082b444d in dst_neigh_output (skb=0x37fa13c0, n=0x37e97800,
dst=<optimized out>) at include/net/dst.h:414
#28 ip_finish_output2 (skb=0x37fa13c0) at net/ipv4/ip_output.c:201
#29 ip_finish_output (skb=<optimized out>) at net/ipv4/ip_output.c:234
#30 0x082b4613 in ip_output (skb=0x37fa13c0) at net/ipv4/ip_output.c:307
#31 0x082b34e3 in dst_output (skb=0x37fa13c0) at include/net/dst.h:449
#32 ip_local_out (skb=0x37fa13c0) at net/ipv4/ip_output.c:110
#33 0x082b3624 in ip_build_and_send_pkt (skb=0x37fa13c0, sk=0x3711cf00,
saddr=838969536, daddr=4261456064, opt=0x0) at net/ipv4/ip_output.c:162
#34 0x082d1060 in tcp_v4_conn_request (sk=0x3711cf00, skb=0x37fa1300) at
net/ipv4/tcp_ipv4.c:1652
#35 0x082c7f3c in tcp_rcv_state_process (sk=0x3711cf00, skb=0x37fa1300,
th=0x3724c662, len=40) at net/ipv4/tcp_input.c:5927
#36 0x082ced1d in tcp_v4_do_rcv (sk=0x3711cf00, skb=0x37fa1300) at
net/ipv4/tcp_ipv4.c:1896
#37 0x082d1dd6 in tcp_v4_rcv (skb=0x37fa1300) at net/ipv4/tcp_ipv4.c:2037
#38 0x082af936 in ip_local_deliver_finish (skb=0x37fa1300) at
net/ipv4/ip_input.c:225
---Type <return> to continue, or q <return> to quit---
#39 ip_local_deliver (skb=0x37fa1300) at net/ipv4/ip_input.c:263
#40 0x082afd38 in dst_input (skb=0x37fa1300) at include/net/dst.h:455
#41 ip_rcv_finish (skb=0x37fa1300) at net/ipv4/ip_input.c:373
#42 ip_rcv (skb=<optimized out>, dev=0x37cc2000, pt=0x83ef740,
orig_dev=0x37cc2000) at net/ipv4/ip_input.c:451
#43 0x0828ecd4 in __netif_receive_skb (skb=0x37fa1300) at net/core/dev.c:3356
#44 0x0828f039 in process_backlog (napi=0x83f2040, quota=1) at
net/core/dev.c:3826
#45 0x08292b2c in net_rx_action (h=0x84a314c) at net/core/dev.c:3984
#46 0x080859a5 in __do_softirq () at kernel/softirq.c:247
#47 0x08085b05 in do_softirq () at kernel/softirq.c:295
#48 do_softirq () at kernel/softirq.c:282
#49 0x08085d55 in invoke_softirq () at kernel/softirq.c:329
#50 irq_exit () at kernel/softirq.c:348
#51 0x0805ef3a in do_IRQ (irq=5, regs=0x3716a8a0) at arch/um/kernel/irq.c:295
#52 0x0805efab in sigio_handler (sig=29, unused_si=0x0, regs=0x3716a8a0) at
arch/um/kernel/irq.c:53
#53 0x08073b77 in sig_handler_common (sig=29, si=0x0, mc=0x0) at
arch/um/os-Linux/signal.c:44
#54 0x08073b00 in unblock_signals () at arch/um/os-Linux/signal.c:282
#55 0x08238f75 in arch_local_irq_enable () at
/home/tfoerste/devel/linux/arch/um/include/asm/irqflags.h:21
#56 spin_unlock_irq (lock=<optimized out>) at include/linux/spinlock.h:335
#57 blk_queue_bio (q=0x37ea0000, bio=0x37136e00) at block/blk-core.c:1529
#58 0x08237876 in generic_make_request (bio=0x37136e00) at block/blk-core.c:1792
#59 0x08237959 in submit_bio (rw=96, bio=0x37136e00) at block/blk-core.c:1844
#60 0x0812a225 in submit_bh (rw=96, bh=0x379d42a0) at fs/buffer.c:2904
#61 0x081601ca in __ext3_get_inode_loc (iloc=0x3716ac60, in_mem=0,
inode=<optimized out>) at fs/ext3/inode.c:2824
#62 0x08160764 in ext3_iget (sb=0x37e9a000, ino=59551) at fs/ext3/inode.c:2906
#63 0x0816716c in ext3_lookup (dentry=0x3797de80, dir=0x379e6f6c,
flags=<optimized out>) at fs/ext3/namei.c:1033
#64 ext3_lookup (dir=0x379e6f6c, dentry=0x3797de80, flags=1) at
fs/ext3/namei.c:1014
#65 0x08109f2f in lookup_real (dir=<optimized out>, dentry=0x3797de80,
flags=<optimized out>) at fs/namei.c:1321
#66 0x0810a041 in __lookup_hash (name=<optimized out>, base=<optimized out>,
flags=1) at fs/namei.c:1339
#67 0x0810b41b in lookup_slow (nd=0x3716ad8c, name=<optimized out>,
path=0x3716ad24) at fs/namei.c:1458
#68 0x0810c74b in walk_component (follow=1, name=0x3716ad94, type=<optimized
out>, path=0x3716ad24, nd=0x3716ad8c) at fs/namei.c:1547
#69 lookup_last (path=0x3716ad24, nd=0x3716ad8c) at fs/namei.c:1949
#70 path_lookupat (dfd=<optimized out>, name=<optimized out>, flags=65,
nd=0x3716ad8c) at fs/namei.c:1984
#71 0x0810c7d6 in filename_lookup (dfd=-100, name=0x3723e000, flags=1,
nd=0x3716ad8c) at fs/namei.c:2023
#72 0x0810cd4f in user_path_at_empty (dfd=-100, name=0x4f407858 <Address
0x4f407858 out of bounds>, flags=1, path=0x3716ae24, empty=0x0) at
fs/namei.c:2166
#73 0x0810cdde in user_path_at (dfd=-100, name=0x4f407858 <Address 0x4f407858
out of bounds>, flags=1, path=0x3716ae24) at fs/namei.c:2177
#74 0x08105a87 in vfs_fstatat (dfd=-100, filename=0x4f407858 <Address
0x4f407858 out of bounds>, stat=0x3716ae58, flag=<optimized out>) at
fs/stat.c:88
#75 0x08105ae8 in vfs_stat (name=0x4f407858 <Address 0x4f407858 out of bounds>,
stat=0x3716ae58) at fs/stat.c:101
#76 0x08105d39 in sys_stat64 (filename=0x4f407858 <Address 0x4f407858 out of
bounds>, statbuf=0x42afffb0) at fs/stat.c:376
#77 0x08062ec6 in handle_syscall (r=0x37145e90) at
arch/um/kernel/skas/syscall.c:35
#78 0x0807710f in handle_trap (local_using_sysemu=<optimized out>,
regs=0x37145e90, pid=2053) at arch/um/os-Linux/skas/process.c:193
---Type <return> to continue, or q <return> to quit---
#79 userspace (regs=0x37145e90) at arch/um/os-Linux/skas/process.c:426
#80 0x0805f8ec in fork_handler () at arch/um/kernel/process.c:160
#81 0x00000000 in ?? ()
(gdb) quit
A debugging session is active.
Inferior 1 [process 997] will be detached.
Quit anyway? (y or n) y
Detaching from program: /usr/local/bin/linux-v3.6-10970-g4d7127d, process 997
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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