[2.6.11.8] Hang with IrDA

[Jochen Hein <jochen@jochen.org>]

[Please follow up to Linux-kernel or CC me; I'm not subscribed to irda-users]

I'm trying to communicate with my Handy via IrDA, using scmxx.
# scmxx -d /dev/ircomm0 --system-charset utf-8 -i

That command hangs, SysRQ-t shows:

...
May 11 08:40:24 hermes kernel: scmxx         S CE879D64     0  9248   6505                     (L-TLB)
May 11 08:40:24 hermes kernel: ce879d50 00000046 c1405a60 ce879d64 ce879d2c c0103a92 00000000 c03ebba0 
May 11 08:40:24 hermes kernel:        00000286 c0c5e020 ce879d64 ce879d2c c0c5e020 00000001 c04d5be8 c1405020 
May 11 08:40:24 hermes kernel:        00000000 00000000 1ce069c0 000f66db c012d063 d1006aa0 d1006bf8 00000286 
May 11 08:40:24 hermes kernel: Call Trace:
May 11 08:40:24 hermes kernel:  [schedule_timeout+105/192] schedule_timeout+0x69/0xc0
May 11 08:40:24 hermes kernel:  [pg0+558195132/1068463104] ircomm_tty_wait_until_sent+0xcc/0x160 [ircomm_tty]
May 11 08:40:24 hermes kernel:  [tty_wait_until_sent+225/240] tty_wait_until_sent+0xe1/0xf0
May 11 08:40:24 hermes kernel:  [pg0+558193184/1068463104] ircomm_tty_close+0x120/0x280 [ircomm_tty]
May 11 08:40:24 hermes kernel:  [release_dev+2072/2112] release_dev+0x818/0x840
May 11 08:40:24 hermes kernel:  [tty_release+18/32] tty_release+0x12/0x20
May 11 08:40:24 hermes kernel:  [__fput+333/352] __fput+0x14d/0x160
May 11 08:40:24 hermes kernel:  [filp_close+79/128] filp_close+0x4f/0x80
May 11 08:40:24 hermes kernel:  [put_files_struct+113/208] put_files_struct+0x71/0xd0
May 11 08:40:24 hermes kernel:  [do_exit+211/896] do_exit+0xd3/0x380
May 11 08:40:24 hermes kernel:  [do_group_exit+63/176] do_group_exit+0x3f/0xb0
May 11 08:40:24 hermes kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
...
May 11 08:41:54 hermes kernel: scmxx         S 00000000     0  9248   6505                     (L-TLB)
May 11 08:41:54 hermes kernel: ce879d50 00000046 c1405020 00000000 00000000 699c7680 000f66e7 c03ebba0 
May 11 08:41:54 hermes kernel:        d1006aa0 c8331560 00000000 ce879d2c c8331560 00000001 c04d5be8 c1405020 
May 11 08:41:54 hermes kernel:        00000000 00000000 3c914f40 000f66f0 c012d063 d1006aa0 d1006bf8 00000286 
May 11 08:41:54 hermes kernel: Call Trace:
May 11 08:41:54 hermes kernel:  [schedule_timeout+105/192] schedule_timeout+0x69/0xc0
May 11 08:41:54 hermes kernel:  [pg0+558195132/1068463104] ircomm_tty_wait_until_sent+0xcc/0x160 [ircomm_tty]
May 11 08:41:54 hermes kernel:  [tty_wait_until_sent+225/240] tty_wait_until_sent+0xe1/0xf0
May 11 08:41:54 hermes kernel:  [pg0+558193184/1068463104] ircomm_tty_close+0x120/0x280 [ircomm_tty]
May 11 08:41:54 hermes kernel:  [release_dev+2072/2112] release_dev+0x818/0x840
May 11 08:41:54 hermes kernel:  [tty_release+18/32] tty_release+0x12/0x20
May 11 08:41:54 hermes kernel:  [__fput+333/352] __fput+0x14d/0x160
May 11 08:41:54 hermes kernel:  [filp_close+79/128] filp_close+0x4f/0x80
May 11 08:41:54 hermes kernel:  [put_files_struct+113/208] put_files_struct+0x71/0xd0
May 11 08:41:54 hermes kernel:  [do_exit+211/896] do_exit+0xd3/0x380
May 11 08:41:54 hermes kernel:  [do_group_exit+63/176] do_group_exit+0x3f/0xb0
May 11 08:41:54 hermes kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
...
May 11 08:42:33 hermes kernel: scmxx         S 00000000     0  9248   6505                     (L-TLB)
May 11 08:42:33 hermes kernel: ce879d50 00000046 c1405020 00000000 00000000 699c7680 000f66e7 c03ebba0 
May 11 08:42:33 hermes kernel:        d1006aa0 c819baa0 00000000 ce879d2c c819baa0 00000001 c04d5be8 c1405020 
May 11 08:42:33 hermes kernel:        00000000 00000000 3142a180 000f66f9 c012d063 d1006aa0 d1006bf8 00000286 
May 11 08:42:33 hermes kernel: Call Trace:
May 11 08:42:33 hermes kernel:  [schedule_timeout+105/192] schedule_timeout+0x69/0xc0
May 11 08:42:33 hermes kernel:  [pg0+558195132/1068463104] ircomm_tty_wait_until_sent+0xcc/0x160 [ircomm_tty]
May 11 08:42:33 hermes kernel:  [tty_wait_until_sent+225/240] tty_wait_until_sent+0xe1/0xf0
May 11 08:42:33 hermes kernel:  [pg0+558193184/1068463104] ircomm_tty_close+0x120/0x280 [ircomm_tty]
May 11 08:42:33 hermes kernel:  [release_dev+2072/2112] release_dev+0x818/0x840
May 11 08:42:33 hermes kernel:  [tty_release+18/32] tty_release+0x12/0x20
May 11 08:42:33 hermes kernel:  [__fput+333/352] __fput+0x14d/0x160
May 11 08:42:33 hermes kernel:  [filp_close+79/128] filp_close+0x4f/0x80
May 11 08:42:33 hermes kernel:  [put_files_struct+113/208] put_files_struct+0x71/0xd0
May 11 08:42:33 hermes kernel:  [do_exit+211/896] do_exit+0xd3/0x380
May 11 08:42:33 hermes kernel:  [do_group_exit+63/176] do_group_exit+0x3f/0xb0
May 11 08:42:33 hermes kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
...
May 11 08:43:25 hermes kernel: scmxx         S CE879CF4     0  9248   6505                     (L-TLB)
May 11 08:43:25 hermes kernel: ce879d50 00000046 ce879d1c ce879cf4 c012974d ce879d14 c01053fa c03ebba0 
May 11 08:43:25 hermes kernel:        c01053fa c5d22aa0 0268cb43 ce879d64 c5d22aa0 00000001 c04d5be8 c1405020 
May 11 08:43:25 hermes kernel:        00000000 00000000 81de8080 000f6705 c012d063 d1006aa0 d1006bf8 00000286 
May 11 08:43:25 hermes kernel: Call Trace:
May 11 08:43:25 hermes kernel:  [schedule_timeout+105/192] schedule_timeout+0x69/0xc0
May 11 08:43:25 hermes kernel:  [pg0+558195132/1068463104] ircomm_tty_wait_until_sent+0xcc/0x160 [ircomm_tty]
May 11 08:43:25 hermes kernel:  [tty_wait_until_sent+225/240] tty_wait_until_sent+0xe1/0xf0
May 11 08:43:25 hermes kernel:  [pg0+558193184/1068463104] ircomm_tty_close+0x120/0x280 [ircomm_tty]
May 11 08:43:25 hermes kernel:  [release_dev+2072/2112] release_dev+0x818/0x840
May 11 08:43:25 hermes kernel:  [tty_release+18/32] tty_release+0x12/0x20
May 11 08:43:25 hermes kernel:  [__fput+333/352] __fput+0x14d/0x160
May 11 08:43:25 hermes kernel:  [filp_close+79/128] filp_close+0x4f/0x80
May 11 08:43:25 hermes kernel:  [put_files_struct+113/208] put_files_struct+0x71/0xd0
May 11 08:43:25 hermes kernel:  [do_exit+211/896] do_exit+0xd3/0x380
May 11 08:43:25 hermes kernel:  [do_group_exit+63/176] do_group_exit+0x3f/0xb0
May 11 08:43:25 hermes kernel:  [syscall_call+7/11] syscall_call+0x7/0xb

There is no other IrDA-user, the process can't be killed with "kill
-9", strace to that PID is not permitted (as root):
attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted

Any ideas?

Jochen

-- 
#include <~/.signature>: permission denied
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