Hello,
I’m using BBB board A5C, and kernel version 3.15.3-bone3.1. Trying to debug vmlinux using KGDB over Serial.
Uboot args: netargs setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},${nfsopts} rw ip=dhcp kgdb8250=ttyO0,115200n8 kgdboc=ttyO0,115200n8 kgdbwait
It gives below error
[ 2.202268] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 2.203793] omap_uart 44e09000.serial: no wakeirq for uart0
[ 2.204088] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0
[ 3.041678] console [ttyO0] enabled
[ 3.045821] omap_uart 48022000.serial: no wakeirq for uart0
[ 3.051890] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89, base_baud = 3000000) is a OMAP UART1
[ 3.062002] kgdb: Registered I/O driver kgdboc.
[ 3.066757] kgdb: Waiting for connection from remote gdb…
[ 3.072631] Internal error: Oops - undefined instruction: 0 [#1] THUMB2
Entering kdb (current=0xdf058000, pid 1) due to Keyboard Entry
kdb>go
Catastrophic error detected
kdb_continue_catastrophic=0, attempting to continue
[ 144.265474] Modules linked in:
[ 144.268684] CPU: 0 PID: 1 Comm: swapper Not tainted 3.15.3-bone3.1 #2
[ 144.275436] task: df058000 ti: df046000 task.ti: df046000
[ 144.281104] PC is at kgdb_breakpoint+0x34/0x5c
[ 144.285762] LR is at kgdb_register_io_module+0xc9/0xe0
[ 144.291147] pc : [] lr : [] psr: 40000133
[ 144.291147] sp : df047ea8 ip : 0000002e fp : c08d83a9
[ 144.303182] r10: 00000000 r9 : df046008 r8 : c0904008
[ 144.308656] r7 : c0953b54 r6 : c0904018 r5 : c09e6d6c r4 : c09e6d68
[ 144.315497] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 0000002f
[ 144.322339] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment kernel
[ 144.330182] Control: 50c5387d Table: 80004019 DAC: 00000015
[ 144.336202] Process swapper (pid: 1, stack limit = 0xdf046240)
[ 144.342315] Stack: (0xdf047ea8 to 0xdf048000)
[ 144.346882] 7ea0: 00000000 c09e6d68 c0953b54 c0079f0d 00000000 c0953b1c
[ 144.355457] 7ec0: c0a687e0 c034256d 00000000 00000000 00000000 c08fa274 00000006 c0990e00
[ 144.364033] 7ee0: c0990e00 c00086af df07ee00 c010a799 1ad03929 c077f410 df07ee00 c0565400
[ 144.372608] 7f00: df00a780 1ad03929 0000008f c010a955 dfefc521 c05bbe38 000000f7 c0040d5d
[ 144.381182] 7f20: 00000000 00000000 00000000 c086d608 dfefc529 c09848f0 00000006 1ad03929
[ 144.389758] 7f40: 00000000 c08fa274 00000006 c0990e00 c0990e00 c08ac409 c08e8de8 000000f7
[ 144.398332] 7f60: c08e8ddc c08aca29 00000006 00000006 c08ac409 75bd7dab 57d0f594 76a337f9
[ 144.406908] 7f80: f67b35ff 00000e00 c0550d19 00000000 00000000 00000000 00000000 00000000
[ 144.415482] 7fa0: 00000000 c0550d23 00000000 c000d1f9 00000000 00000000 00000000 00000000
[ 144.424057] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 144.432632] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 dffaff96 df7d5fbb
[ 144.441223] [] (kgdb_breakpoint) from [] (kgdb_register_io_module+0xc9/0xe0)
[ 144.450453] [] (kgdb_register_io_module) from [] (configure_kgdboc+0xe9/0x144)
[ 144.459854] [] (configure_kgdboc) from [] (do_one_initcall+0xb3/0x134)
[ 144.468528] [] (do_one_initcall) from [] (kernel_init_freeable+0x141/0x1b8)
[ 144.477656] [] (kernel_init_freeable) from [] (kernel_init+0xb/0xb4)
[ 144.486148] [] (kernel_init) from [] (ret_from_fork+0x11/0x38)
[ 144.494088] Code: 0690 69b3 b103 4798 (deff) e7ff
[ 144.499141] —[ end trace 2cfec94027b21ac8 ]—
[ 144.503978] Kernel panic - not syncing: Fatal exception
PANIC: Fatal exception
[ 144.511648] Internal error: Oops - undefined instruction: 0 [#2] THUMB2
Entering kdb (current=0xdf058000, pid 1) due to Keyboard Entry