kgdb is not working for powerpc, neither system nor ports. I've used "strings" to extract the later information below about the failures. The time frames to failure are widely variable, minutes to hours. I've never seen the below with a debug kernel, only with production-style. I have not seen any such problems for powerpc64, aarch64 (with -mcpu=cortex-a53 ), armv6 (with -mcpu=cortex-a7 ), or amd64. Just powerpc. The powerpc and powerpc64 hardware is (e.g.) the same old PowerMac G5 so-called "Quad Core" used with two different boot SSDs. Note: This reproduces for me for pure gcc 4.2.1 based builds. My usual clang-targetting- powerpc experiments are not involved here. I'd not updated for a long time before this due to the status of the clang compiler not changing and its powerpc stack code-generation problems being difficult to work around. My kernels are unusual by having both sc and vt in the build and ps3 disabled. I happen to be using sc because it works with the 2560x1440 display that is currently connected but with vt it fails to boot for such a size. Of 7 example vmcore.* files. . . (Note that all are pid 11 Idle-process thread failures) 3 contain: fatal kernel trap: exception = 0x903a64e (unknown) srr0 = 0x7ff760 srr1 = 0xc1007c lr = 0x907f curthread = 0x147d6c0 pid = 11, comm = idle: cpu0 [ thread pid 11 tid 100003 ] Stopped at ffs_truncate+0x1080: stw r11, 0xf8(r31) 1 contains (cpu1 instead of cpu0, so different tid): fatal kernel trap: exception = 0x903a64e (unknown) srr0 = 0x7ff760 srr1 = 0xc1007c lr = 0x907f curthread = 0x147d360 pid = 11, comm = idle: cpu1 [ thread pid 11 tid 100004 ] Stopped at ffs_truncate+0x1080: stw r11, 0xf8(r31) 1 contains: fatal kernel trap: exception = 0x21000000 (unknown) srr0 = 0x7c0903 srr1 = 0xa64e8004 lr = 0x807fc9e7 curthread = 0x147d000 pid = 11, comm = idle: cpu2 [ thread pid 11 tid 100005 ] Stopped at audit_commit+0x24f: illegal instruction 4915f00 1 contains: fatal kernel trap: exception = 0x300 (data storage interrupt) virtual address = 0x7ff76000 dsisr = 0x40000000 srr0 = 0x8e3cf8 srr1 = 0x1032 lr = 0x8e3ce8 curthread = 0x147d6c0 pid = 11, comm = idle: cpu0 panic: data storage interrupt trap cpuid = 0 time = 1494057319 KDB: stack backtrace: 0xdf5e52c0: at kdb_backtrace+0x5c 0xdf5e5330: at vpanic+0x1ec 0xdf5e53a0: at panic+0x54 0xdf5e53f0: at trap_fatal+0x1cc 0xdf5e5420: at trap+0x122c 0xdf5e55c0: at powerpc_interrupt+0x180 0xdf5e55f0: kernel DSI read trap _at_ 0x7ff76000 by db_disasm+0x30: srr1=0x1032 r1=0xdf5e56b0 cr=0x24009022 xer=0 ctr=0x1852cc sr=0x40000000 0xdf5e56b0: at 0x1007460 0xdf5e56d0: at db_print_loc_and_inst+0x60 0xdf5e5700: at db_trap+0x104 0xdf5e5790: at kdb_trap+0x1bc 0xdf5e5810: at trap_fatal+0x1b0 0xdf5e5840: at trap+0x1184 0xdf5e5870: kernel DECR trap by cpu_idle_60x+0x88: srr1=0x9032 r1=0xdf5e5930 cr=0x40000042 xer=0x20000000 ctr=0x8e3bd8 saved LR(0xfffffffe) is invalid And 1 contains: fatal kernel trap: exception = 0x0 (unknown) srr0 = 0x903a64e srr1 = 0x80042100 lr = 0xc9e7c800 curthread = 0x147d360 pid = 11, comm = idle: cpu1 [ thread pid 11 tid 100004 ] Stopped at 0x903a64e: fatal kernel trap: exception = 0x300 (data storage interrupt) virtual address = 0x903a64e dsisr = 0x40000000 srr0 = 0x8e3cf8 srr1 = 0x1032 lr = 0x8e3ce8 curthread = 0x147d360 pid = 11, comm = idle: cpu1 panic: data storage interrupt trap cpuid = 1 time = 1494132014 KDB: stack backtrace: 0xdf5ea2c0: at kdb_backtrace+0x5c 0xdf5ea330: at vpanic+0x1ec 0xdf5ea3a0: at panic+0x54 0xdf5ea3f0: at trap_fatal+0x1cc 0xdf5ea420: at trap+0x122c 0xdf5ea5c0: at powerpc_interrupt+0x180 0xdf5ea5f0: kernel DSI read trap _at_ 0x903a64e by db_disasm+0x30: srr1=0x1032 r1=0xdf5ea6b0 cr=0x24009022 xer=0 ctr=0x1852cc sr=0x40000000 0xdf5ea6b0: at 0x1007460 0xdf5ea6d0: at db_print_loc_and_inst+0x60 0xdf5ea700: at db_trap+0x104 0xdf5ea790: at kdb_trap+0x1bc 0xdf5ea810: at trap_fatal+0x1b0 0xdf5ea840: at trap+0x122c 0xdf5ea870: kernel EXI trap by cpu_idle_60x+0x88: srr1=0x9032 r1=0xdf5ea930 cr=0x40000042 xer=0x20000000 ctr=0x8e3bd8 saved LR(0x5) is invalid Most (but not all) of the above were while the old PowerMac was sitting unused. The pid 11 Idle thread commonality suggests to me some sort of interrupt oddity messing up when the idle threads were put to use for the interrupt. The /usr/src/sys/powerpc/conf/* files in use are (-NODBG for production style and -DBG for debug style): # more /usr/src/sys/powerpc/conf/GENERIC64vtsc-NODBG # # GENERIC -- Custom configuration for the powerpc/powerpc64 # include "GENERIC64" ident GENERIC64vtsc-NODBG makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols nooptions PS3 # Sony Playstation 3 HACK!!! to allow sc options KDB # Enable kernel debugger support options ALT_BREAK_TO_DEBUGGER options BREAK_TO_DEBUGGER # For minimum debugger support (stable branch) use: options KDB_TRACE # Print a stack trace for a panic options DDB # Enable the kernel debugger options GDB # HACK!!! ... # Extra stuff: #options VERBOSE_SYSINIT # Enable verbose sysinit messages #options BOOTVERBOSE=1 #options BOOTHOWTO=RB_VERBOSE #options KTR #options KTR_MASK=KTR_TRAP ##options KTR_CPUMASK=0xF #options KTR_VERBOSE # HACK!!! to allow sc for 2560x1440 display on Radeon X1950 that vt historically mishandled during booting device sc #device kbdmux # HACK: already listed by vt options SC_OFWFB # OFW frame buffer options SC_DFLT_FONT # compile font in makeoptions SC_DFLT_FONT=cp437 # Disable any extra checking for. . . nooptions DEADLKRES # Enable the deadlock resolver nooptions INVARIANTS # Enable calls of extra sanity checking nooptions INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS nooptions WITNESS # Enable checks to detect deadlocks and cycles nooptions WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed nooptions DIAGNOSTIC nooptions MALLOC_DEBUG_MAXZONES # Separate malloc(9) zones I show my production (NODBG) and debug (DBG) # more /usr/src/sys/powerpc/conf/GENERICvtsc-NODBG # # GENERIC -- Custom configuration for the powerpc/powerpc # include "GENERIC" ident GENERICvtsc-NODBG makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols nooptions PS3 # Sony Playstation 3 HACK!!! to allow sc options KDB # Enable kernel debugger support options ALT_BREAK_TO_DEBUGGER options BREAK_TO_DEBUGGER # For minimum debugger support (stable branch) use: options KDB_TRACE # Print a stack trace for a panic options DDB # Enable the kernel debugger options GDB # HACK!!! ... # Extra stuff: #options VERBOSE_SYSINIT # Enable verbose sysinit messages #options BOOTVERBOSE=1 #options BOOTHOWTO=RB_VERBOSE #options KTR #options KTR_MASK=KTR_TRAP ##options KTR_CPUMASK=0xF #options KTR_VERBOSE # HACK!!! to allow sc for 2560x1440 display on Radeon X1950 that vt historically mishandled during booting device sc #device kbdmux # HACK: already listed by vt options SC_OFWFB # OFW frame buffer options SC_DFLT_FONT # compile font in makeoptions SC_DFLT_FONT=cp437 # Disable any extra checking for. . . nooptions DEADLKRES # Enable the deadlock resolver nooptions INVARIANTS # Enable calls of extra sanity checking nooptions INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS nooptions WITNESS # Enable checks to detect deadlocks and cycles nooptions WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed nooptions DIAGNOSTIC nooptions MALLOC_DEBUG_MAXZONES # Separate malloc(9) zones # more /usr/src/sys/powerpc/conf/GENERICvtsc-DBG # # GENERIC -- Custom configuration for the powerpc/powerpc # include "GENERIC" ident GENERICvtsc-DBG makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols nooptions PS3 # Sony Playstation 3 HACK!!! to allow sc options KDB # Enable kernel debugger support options ALT_BREAK_TO_DEBUGGER options BREAK_TO_DEBUGGER # For minimum debugger support (stable branch) use: options KDB_TRACE # Print a stack trace for a panic options DDB # Enable the kernel debugger options GDB # HACK!!! ... # Extra stuff: options VERBOSE_SYSINIT # Enable verbose sysinit messages options BOOTVERBOSE=1 options BOOTHOWTO=RB_VERBOSE #options KTR #options KTR_MASK=KTR_TRAP|KTR_PROC ##options KTR_CPUMASK=0xF #options KTR_VERBOSE # HACK!!! to allow sc for 2560x1440 display on Radeon X1950 that vt historically mishandled during booting device sc #device kbdmux # HACK: already listed by vt options SC_OFWFB # OFW frame buffer options SC_DFLT_FONT # compile font in makeoptions SC_DFLT_FONT=cp437 # Enable any extra checking for. . . options DEADLKRES # Enable the deadlock resolver options INVARIANTS # Enable calls of extra sanity checking options INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS options WITNESS # Enable checks to detect deadlocks and cycles options WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed options DIAGNOSTIC options MALLOC_DEBUG_MAXZONES=8 # Separate malloc(9) zones For both -NODBG and -DBG the: options ALT_BREAK_TO_DEBUGGER options BREAK_TO_DEBUGGER are recent additions because of the problem. I explicitly gave myself the option to break to the debugger if I decide to. === Mark Millard markmi at dsl-only.netReceived on Tue May 09 2017 - 19:07:37 UTC
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