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This command allows users to quickly retrieve a stacktrace using a handle obtained from a memory coredump. Example output: (gdb) lx-stack_depot_lookup 0x00c80300 0xffff8000807965b4 <kmem_cache_alloc_noprof+660>: mov x20, x0 0xffff800081a077d8 <kmem_cache_oob_alloc+76>: mov x1, x0 0xffff800081a079a0 <test_version_show+100>: cbnz w0, 0xffff800081a07968 <test_version_show+44> 0xffff800082f4a3fc <kobj_attr_show+60>: ldr x19, [sp, #16] 0xffff800080a0fb34 <sysfs_kf_seq_show+460>: ldp x3, x4, [sp, #96] 0xffff800080a0a550 <kernfs_seq_show+296>: ldp x19, x20, [sp, #16] 0xffff8000808e7b40 <seq_read_iter+836>: mov w5, w0 0xffff800080a0b8ac <kernfs_fop_read_iter+804>: mov x23, x0 0xffff800080914a48 <copy_splice_read+972>: mov x6, x0 0xffff8000809151c4 <do_splice_read+348>: ldr x21, [sp, #32] Link: https://lkml.kernel.org/r/20240723064902.124154-5-kuan-ying.lee@canonical.com Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Kieran Bingham <kbingham@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (c) 2023 MediaTek Inc.
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#
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# Authors:
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# Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
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#
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import gdb
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from linux import utils, constants
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if constants.LX_CONFIG_STACKDEPOT:
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stack_record_type = utils.CachedType('struct stack_record')
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DEPOT_STACK_ALIGN = 4
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def help():
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t = """Usage: lx-stack_depot_lookup [Hex handle value]
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Example:
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lx-stack_depot_lookup 0x00c80300\n"""
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gdb.write("Unrecognized command\n")
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raise gdb.GdbError(t)
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def stack_depot_fetch(handle):
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global DEPOT_STACK_ALIGN
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global stack_record_type
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stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled')
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if stack_depot_disabled:
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raise gdb.GdbError("stack_depot_disabled\n")
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handle_parts_t = gdb.lookup_type("union handle_parts")
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parts = handle.cast(handle_parts_t)
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offset = parts['offset'] << DEPOT_STACK_ALIGN
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pools_num = gdb.parse_and_eval('pools_num')
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if handle == 0:
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raise gdb.GdbError("handle is 0\n")
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pool_index = parts['pool_index_plus_1'] - 1
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if pool_index >= pools_num:
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gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pools_num, handle))
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return gdb.Value(0), 0
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stack_pools = gdb.parse_and_eval('stack_pools')
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try:
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pool = stack_pools[pool_index]
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stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer())
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size = int(stack['size'].cast(utils.get_ulong_type()))
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return stack['entries'], size
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except Exception as e:
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gdb.write("%s\n" % e)
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return gdb.Value(0), 0
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def stack_depot_print(handle):
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if not constants.LX_CONFIG_STACKDEPOT:
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raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled")
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entries, nr_entries = stack_depot_fetch(handle)
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if nr_entries > 0:
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for i in range(0, nr_entries):
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try:
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gdb.execute("x /i 0x%x" % (int(entries[i])))
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except Exception as e:
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gdb.write("%s\n" % e)
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class StackDepotLookup(gdb.Command):
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"""Search backtrace by handle"""
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def __init__(self):
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if constants.LX_CONFIG_STACKDEPOT:
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super(StackDepotLookup, self).__init__("lx-stack_depot_lookup", gdb.COMMAND_SUPPORT)
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def invoke(self, args, from_tty):
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if not constants.LX_CONFIG_STACKDEPOT:
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raise gdb.GdbError('CONFIG_STACKDEPOT is not set')
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argv = gdb.string_to_argv(args)
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if len(argv) == 1:
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handle = int(argv[0], 16)
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stack_depot_print(gdb.Value(handle).cast(utils.get_uint_type()))
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else:
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help()
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StackDepotLookup()
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