Adrian Chadd wrote:
What, so fetching data from ftpd running on the xen domU to another
LAN connected host?

so the problem seems to come more from upload traffic than download ?

See, thats the sort of information I need to reproduce the problem. :)

I enable a ftp on a local LAN host (not the dom0) and it confirms that ftp get works whereas a ftp put command triggers an immediate crash :

   # ftp 192.168.0.103
   ftp: Unknown port `ftp', using port 21
   Connected to 192.168.0.103.
   220 random FTP server ready.
   Name (192.168.0.103): bruno
   331 Password required for bruno.
   Password:
   230 User bruno logged in.
   Remote system type is UNIX.
   Using binary mode to transfer files.
   ftp> get zaum_by_slbprod-2.6.sql
   local: zaum_by_slbprod-2.6.sql remote: zaum_by_slbprod-2.6.sql
   229 Entering Extended Passive Mode (|||14185|)
   150 Opening BINARY mode data connection for zaum_by_slbprod-2.6.sql
   (10514 bytes).
   226 Transfer complete.
   10514 bytes received in 00:00 (31.29 KB/s)
   ftp> put foobar
   local: foobar remote: foobar
   229 Entering Extended Passive Mode (|||20050|)
   150 Opening BINARY mode data connection for foobar.
   Kernel page fault with the following non-sleepable locks held:
   exclusive sleep mutex xennetif_tx (network transmit lock) r = 0
   (0xc39430a0) locked @
   /home/adrian/work/freebsd/xen/svn/head/sys/dev/xen/netfront/netfront.c:1144
   KDB: stack backtrace:
   X_db_sym_numargs(c03578d2,c3527ab4,c01166d5,c037b2c8,478,...) at
   X_db_sym_numargs+0x146
   kdb_backtrace(c037b2c8,478,ffffffff,c050a9cc,c3527aec,...) at
   kdb_backtrace+0x29
   witness_display_spinlock(c0359db5,c3527b00,4,1,0,...) at
   witness_display_spinlock+0x75
   witness_warn(5,0,c0383c74,c3527b5c,c,...) at witness_warn+0x1fd
   trap(c3527b88) at trap+0x13e
   alltraps(c39430a0,0,c037b2c8,478,2,...) at alltraps+0x1b
   xlvbd_add(c3943000,c3527cc8,c00c6924,c03ce780,c3782538,...) at
   xlvbd_add+0x36b3
   intr_event_execute_handlers(c37087ec,c3782500,c034fbb5,4e9,c3782570,...)
   at intr_event_execute_handlers+0x125
   intr_event_add_handler(c3948140,c3527d38,c034f8e8,335,c37087ec,...)
   at intr_event_add_handler+0x41f
   fork_exit(c00afe50,c3948140,c3527d38) at fork_exit+0xb8
   fork_trampoline() at fork_trampoline+0x8
   --- trap 0, eip = 0, esp = 0xc3527d70, ebp = 0 ---


   Fatal trap 12: page fault while in kernel mode
   cpuid = 0; apic id = 00
   fault virtual address   = 0x2
   fault code              = supervisor read, page not present
   instruction pointer     = 0x21:0xc02f719b
   stack pointer           = 0x29:0xc3527bc8
   frame pointer           = 0x29:0xc3527bf8
   code segment            = base 0x0, limit 0xf9800, type 0x1b
                           = DPL 1, pres 1, def32 1, gran 1
   processor eflags        = interrupt enabled, resume, IOPL = 0
   current process         = 12 (irq135: xn)
   [thread pid 12 tid 100024 ]
   Stopped at      xlvbd_add+0x204b:       cmpl    $0,0(%edx)
db> bt Tracing pid 12 tid 100024 td 0xc3756d80
   xlvbd_add(c39430a0,0,c037b2c8,478,2,...) at xlvbd_add+0x204b
   xlvbd_add(c3943000,c3527cc8,c00c6924,c03ce780,c3782538,...) at
   xlvbd_add+0x36b3
   intr_event_execute_handlers(c37087ec,c3782500,c034fbb5,4e9,c3782570,...)
   at intr_event_execute_handlers+0x125
   intr_event_add_handler(c3948140,c3527d38,c034f8e8,335,c37087ec,...)
   at intr_event_add_handler+0x41f
   fork_exit(c00afe50,c3948140,c3527d38) at fork_exit+0xb8
   fork_trampoline() at fork_trampoline+0x8
   --- trap 0, eip = 0, esp = 0xc3527d70, ebp = 0 ---
   db>

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