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I experimented with SyncCE; after starting IrDA I got this:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ip_tables: (C) 2000-2006 Netfilter Core Team
=============================================
[ INFO: possible recursive locking detected ]
2.6.19-rc5-2avb #2
- ---------------------------------------------
pppd/26425 is trying to acquire lock:
(&hashbin->hb_spinlock){....}, at: [<dfdea87a>] irlmp_slsap_inuse+0x5a/0x170
[irda]
but task is already holding lock:
(&hashbin->hb_spinlock){....}, at: [<dfdea857>] irlmp_slsap_inuse+0x37/0x170
[irda]
other info that might help us debug this:
1 lock held by pppd/26425:
#0: (&hashbin->hb_spinlock){....}, at: [<dfdea857>]
irlmp_slsap_inuse+0x37/0x170 [irda]
stack backtrace:
[<c010413c>] dump_trace+0x1cc/0x200
[<c010418a>] show_trace_log_lvl+0x1a/0x30
[<c01047f2>] show_trace+0x12/0x20
[<c01048c9>] dump_stack+0x19/0x20
[<c01346ca>] __lock_acquire+0x8fa/0xc20
[<c0134d2d>] lock_acquire+0x5d/0x80
[<c02a851c>] _spin_lock+0x2c/0x40
[<dfdea87a>] irlmp_slsap_inuse+0x5a/0x170 [irda]
[<dfdebab2>] irlmp_open_lsap+0x62/0x180 [irda]
[<dfdf35d1>] irttp_open_tsap+0x181/0x230 [irda]
[<dfdc0c3d>] ircomm_open_tsap+0x5d/0xa0 [ircomm]
[<dfdc05d8>] ircomm_open+0xb8/0xd0 [ircomm]
[<dfdd0477>] ircomm_tty_open+0x4f7/0x570 [ircomm_tty]
[<c020bbe4>] tty_open+0x174/0x340
[<c016bd69>] chrdev_open+0x89/0x170
[<c0167bd6>] __dentry_open+0xa6/0x1d0
[<c0167da5>] nameidata_to_filp+0x35/0x40
[<c0167df9>] do_filp_open+0x49/0x50
[<c0167e47>] do_sys_open+0x47/0xd0
[<c0167f0c>] sys_open+0x1c/0x20
[<c010307d>] sysenter_past_esp+0x56/0x8d
[<b7f86410>] 0xb7f86410
=======================
This apparently happens when irattach is run. Interface itself (irda0) is
created as far as I can tell.
Please let me know if additional information is required.
- -andrey
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