Date: Wed, 16 Oct 2013 02:18:27 +0800 From: Jia-Shiun Li <jiashiun@gmail.com> To: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: BBB triggered trap when disconnecting uart Message-ID: <CAHNYxxPe7maWJMNqXRV4YcpxSdHBv6pKDdMzyVLL8d3Kus7mbg@mail.gmail.com>
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I originally thought it hanged when I unplug my USB-serial dongle (a
PL2303-based one on Windows). But looking closely I found it was
actually dropping to ddb, because if pressed Enter in terminal window
it will continue. And I got the following back trace. Is it possible
the USB-serial chip or term (putty) sent garbage chars to trigger it,
or simply because something went wrong in uart_intr?
The behavior is reproducible. Also happens when I suspend/resume PC.
And system is
FreeBSD beaglebone 10.0-ALPHA4 FreeBSD 10.0-ALPHA4 #0 r256041: Fri Oct
4 16:13:26 CST 2013
jsli@4cbsd:/root/crochet-freebsd/work/obj/arm.armv6/usr/src/sys/BEAGLEBONE
arm
---- 9< --------- 9< --------- 9< -----
t
Tracing pid 65332 tid 100108 td 0xc4d9f960
db_trace_self() at db_trace_self
pc = 0xc052f8fc lr = 0xc022c128 (db_stack_trace+0xf4)
sp = 0xde9467a0 fp = 0xde9467b8
r10 = 0xc0626900
db_stack_trace() at db_stack_trace+0xf4
pc = 0xc022c128 lr = 0xc022ba94 (db_command+0x264)
sp = 0xde9467c0 fp = 0xde946860
r4 = 0x00000000 r5 = 0x00000000
r6 = 0xc059b343
db_command() at db_command+0x264
pc = 0xc022ba94 lr = 0xc022b804 (db_command_loop+0x60)
sp = 0xde946868 fp = 0xde946878
r4 = 0xc0571596 r5 = 0xc058b91b
r6 = 0xc07ccbb0 r7 = 0xde946a48
r8 = 0xc4d9f960 r9 = 0xc0669a04
r10 = 0xc0626b70
db_command_loop() at db_command_loop+0x60
pc = 0xc022b804 lr = 0xc022e204 (db_trap+0xdc)
sp = 0xde946880 fp = 0xde9469a0
r4 = 0x00000000 r5 = 0xde946888
r6 = 0xc0669a30
db_trap() at db_trap+0xdc
pc = 0xc022e204 lr = 0xc038f5bc (kdb_trap+0xd4)
sp = 0xde9469a8 fp = 0xde9469c8
r4 = 0x00000000 r5 = 0x00000001
r6 = 0xc0669a30 r7 = 0xde946a48
kdb_trap() at kdb_trap+0xd4
pc = 0xc038f5bc lr = 0xc0541e70 (undefinedinstruction+0x2b0)
sp = 0xde9469d0 fp = 0xde946a40
r4 = 0x00000000 r5 = 0xc0541b1c
r6 = 0x00000000 r7 = 0xe7ffffff
r8 = 0xc4d9f960 r9 = 0xde946a48
r10 = 0xc038ee34
undefinedinstruction() at undefinedinstruction+0x2b0
pc = 0xc0541e70 lr = 0xc0531134 (exception_exit)
sp = 0xde946a48 fp = 0xde946aa0
r4 = 0x00000001 r5 = 0xc27d4a00
r6 = 0x00060000 r7 = 0xc062ba1c
r8 = 0xc27d4b74 r9 = 0x0000ff7f
r10 = 0x00000000
exception_exit() at exception_exit
pc = 0xc0531134 lr = 0xc038ee24 (kdb_break+0x50)
sp = 0xde946a9c fp = 0xde946aa0
r0 = 0xc0669a14 r1 = 0xc057168a
r2 = 0x00000000 r3 = 0x60000193
r4 = 0x00000001 r5 = 0xc27d4a00
r6 = 0x00060000 r7 = 0xc062ba1c
r8 = 0xc27d4b74 r9 = 0x0000ff7f
r10 = 0x00000000 r12 = 0x00000000
$a() at $a
pc = 0xc038ee38 lr = 0xc025df78 (uart_intr+0xa4)
sp = 0xde946aa8 fp = 0xde946ae8
r4 = 0xc264ed00
uart_intr() at uart_intr+0xa4
pc = 0xc025df78 lr = 0xc032b594 (intr_event_handle+0x84)
sp = 0xde946af0 fp = 0xde946b18
r4 = 0xc264ed00 r5 = 0xde946b38
r6 = 0xc4d9f960 r7 = 0xc0585a55
r8 = 0xc0585a2e r9 = 0x00000000
r10 = 0xc27c2bc0
intr_event_handle() at intr_event_handle+0x84
pc = 0xc032b594 lr = 0xc0532350 (arm_handler_execute+0x50)
sp = 0xde946b20 fp = 0xde946b30
r4 = 0xde946b38 r5 = 0x00000048
r6 = 0xc0652420 r7 = 0xc07ca0d8
r8 = 0x20a87000 r9 = 0x00000000
r10 = 0x00000953
arm_handler_execute() at arm_handler_execute+0x50
pc = 0xc0532350 lr = 0xc054fcc8 (irq_entry+0x6c)
sp = 0xde946b38 fp = 0xde946bc8
r4 = 0xc09b7a30 r5 = 0xc05afd2b
r6 = 0xc05afd2b r7 = 0xc09b7a30
irq_entry() at irq_entry+0x6c
pc = 0xc054fcc8 lr = 0xc0360970 (_sx_sunlock+0x74)
sp = 0xde946b8c fp = 0xde946bc8
r0 = 0x00000000 r1 = 0x00000000
r2 = 0xc05afd2b r3 = 0x00000fe2
r4 = 0xc09b7a30 r5 = 0xc05afd2b
r6 = 0xc05afd2b r7 = 0xc09b7a30
r8 = 0x20a87000 r9 = 0x00000000
r10 = 0x00000953 r12 = 0x000000c0
witness_unlock() at witness_unlock+0x48
pc = 0xc03a9bf0 lr = 0xc0360970 (_sx_sunlock+0x74)
sp = 0xde946bd0 fp = 0xde946bf0
r4 = 0xc09b7a30 r5 = 0x00000fe2
r6 = 0xc05afd2b r7 = 0xc09b7a40
r8 = 0x20a87000 r9 = 0x00000000
r10 = 0x00000953
_sx_sunlock() at _sx_sunlock+0x74
pc = 0xc0360970 lr = 0xc05108c0 (vm_map_lookup_done+0x44)
sp = 0xde946bf8 fp = 0xde946bf8
r4 = 0xde946d10 r5 = 0x00000000
r6 = 0xc3fa1280 r7 = 0x20a88000
vm_map_lookup_done() at vm_map_lookup_done+0x44
pc = 0xc05108c0 lr = 0xc05062cc (unlock_and_deallocate+0xc8)
sp = 0xde946c00 fp = 0xde946c10
unlock_and_deallocate() at unlock_and_deallocate+0xc8
pc = 0xc05062cc lr = 0xc0506180 ($a+0xfc)
sp = 0xde946c18 fp = 0xde946d88
r4 = 0xc05af61a r5 = 0x00000000
r6 = 0xc3fa1280 r7 = 0x20a88000
$a() at $a+0xfc
pc = 0xc0506180 lr = 0xc0504580 (vm_fault+0x88)
sp = 0xde946d90 fp = 0xde946db0
r4 = 0xc09b79e0 r5 = 0x00000002
r6 = 0xc4d9f960 r7 = 0x20a87000
r8 = 0x00000000 r9 = 0x00000002
r10 = 0xc07d0b88
vm_fault() at vm_fault+0x88
pc = 0xc0504580 lr = 0xc054089c (data_abort_handler+0x2a8)
sp = 0xde946db8 fp = 0xde946e58
r4 = 0xc4d9b000 r5 = 0xc4d9f960
r6 = 0xc05b5d32 r7 = 0xc4d9b0ac
r8 = 0xde946e60 r9 = 0xde946eb0
r10 = 0xc09b79e0
data_abort_handler() at data_abort_handler+0x2a8
pc = 0xc054089c lr = 0xc0531134 (exception_exit)
sp = 0xde946e60 fp = 0xbfffdeb0
r4 = 0x20a87000 r5 = 0x00001000
r6 = 0x204000c0 r7 = 0x00000138
r8 = 0x00000000 r9 = 0x204000c8
r10 = 0x20848080
exception_exit() at exception_exit
pc = 0xc0531134 lr = 0x000c5fc8 (0xc5fc8)
sp = 0xde946eb4 fp = 0xbfffdeb0
r0 = 0x20a87000 r1 = 0x00000f80
r2 = 0xa5a5a5a5 r3 = 0xa5a5a5a5
r4 = 0x20a87000 r5 = 0x00001000
r6 = 0x204000c0 r7 = 0x00000138
r8 = 0x00000000 r9 = 0x204000c8
r10 = 0x20848080 r12 = 0x20a87000
Unable to unwind into user mode
db>
Jia-Shiun.
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