[Crash-utility] [PATCH] extension/gcore: Fix the invalid struct size failure of pid_link on 4.19 and newer kernel.
Dave Anderson
anderson at redhat.com
Mon Jun 24 14:52:34 UTC 2019
Thanks Masa, the patch looks good.
And Daisuke, when you update crash-gcore-command package, please also
include the aarch64 patch we discussed last December:
--- crash-gcore-command-1.3.1/gcore.c.orig
+++ crash-gcore-command-1.3.1/gcore.c
@@ -501,6 +501,10 @@ static void gcore_offset_table_init(void
GCORE_MEMBER_OFFSET_INIT(vfp_hard_struct_fpscr, "vfp_hard_struct", "fpscr");
GCORE_MEMBER_OFFSET_INIT(thread_struct_fpsimd_state, "thread_struct", "fpsimd_state");
GCORE_MEMBER_OFFSET_INIT(thread_struct_tp_value, "thread_struct", "tp_value");
+ if (GCORE_INVALID_MEMBER(thread_struct_fpsimd_state)) {
+ GCORE_ANON_MEMBER_OFFSET_INIT(thread_struct_fpsimd_state, "thread_struct", "uw.fpsimd_state");
+ GCORE_ANON_MEMBER_OFFSET_INIT(thread_struct_tp_value, "thread_struct", "uw.tp_value");
+ }
}
static void gcore_size_table_init(void)
Thanks,
Dave
----- Original Message -----
> From: Masayoshi Mizuma <m.mizuma at jp.fujitsu.com>
>
> On 4.19 and newer kernel, gcore command fails as following:
>
> ===========================================================
> gcore: invalid structure size: pid_link
> FILE: libgcore/gcore_coredump_table.c LINE: 423 FUNCTION: pid_alive()
>
> [./crash] error trace: 7f4a7a6762b8 => 7f4a7a676e0f => 53b391 => 53b316
>
> 53b316: SIZE_verify.part.31+70
> 53b391: SIZE_verify+49
>
> gcore: invalid structure size: pid_link
> FILE: libgcore/gcore_coredump_table.c LINE: 423 FUNCTION: pid_alive()
>
> Failed.
> ===========================================================
>
> That is because struct pid_link is removed and struct pid array is added to
> struct signal_struct by commit 2c4704756cab ("pids: Move the pgrp and session
> pid pointers from task_struct to signal_struct").
>
> Get the pointer of struct pid from task_struct->thread_pid or
> signal_struct->pids[] to fix the failure.
>
> Signed-off-by: Masayoshi Mizuma <m mizuma jp fujitsu com>
> ---
> gcore.c | 4 +++
> libgcore/gcore_coredump_table.c | 48 +++++++++++++++++++++++++++------
> libgcore/gcore_defs.h | 2 ++
> 3 files changed, 46 insertions(+), 8 deletions(-)
>
> diff --git a/gcore.c b/gcore.c
> index 65dd7a4..4e1304f 100644
> --- a/gcore.c
> +++ b/gcore.c
> @@ -501,6 +501,10 @@ static void gcore_offset_table_init(void)
> GCORE_MEMBER_OFFSET_INIT(vfp_hard_struct_fpscr, "vfp_hard_struct", "fpscr");
> GCORE_MEMBER_OFFSET_INIT(thread_struct_fpsimd_state, "thread_struct", "fpsimd_state");
> GCORE_MEMBER_OFFSET_INIT(thread_struct_tp_value, "thread_struct", "tp_value");
> + if (MEMBER_EXISTS("task_struct", "thread_pid"))
> + GCORE_MEMBER_OFFSET_INIT(task_struct_thread_pid, "task_struct", "thread_pid");
> + if (MEMBER_EXISTS("signal_struct", "pids"))
> + GCORE_MEMBER_OFFSET_INIT(signal_struct_pids, "signal_struct", "pids");
> }
>
> static void gcore_size_table_init(void)
> diff --git a/libgcore/gcore_coredump_table.c b/libgcore/gcore_coredump_table.c
> index a073591..4cf9c38 100644
> --- a/libgcore/gcore_coredump_table.c
> +++ b/libgcore/gcore_coredump_table.c
> @@ -224,7 +224,7 @@ __task_pid_nr_ns(ulong task, enum pid_type type)
> sizeof(ns), "__task_pid_nr_ns: ns", gcore_verbose_error_handle());
>
> if (pid_alive(task)) {
> - ulong pids_type_pid;
> + ulong pids_type_pid, signal;
>
> if (type != PIDTYPE_PID)
> readmem(task + MEMBER_OFFSET("task_struct",
> @@ -233,10 +233,34 @@ __task_pid_nr_ns(ulong task, enum pid_type type)
> "__task_pid_nr_ns: group_leader",
> gcore_verbose_error_handle());
>
> - readmem(task + OFFSET(task_struct_pids) + type * SIZE(pid_link)
> - + OFFSET(pid_link_pid), KVADDR, &pids_type_pid,
> - sizeof(pids_type_pid),
> - "__task_pid_nr_ns: pids_type_pid", gcore_verbose_error_handle());
> + if (VALID_MEMBER(task_struct_pids))
> + readmem(task + OFFSET(task_struct_pids) +
> + type * SIZE(pid_link) + OFFSET(pid_link_pid),
> + KVADDR, &pids_type_pid,
> + sizeof(pids_type_pid),
> + "__task_pid_nr_ns: pids_type_pid",
> + gcore_verbose_error_handle());
> + else
> + if (type == PIDTYPE_PID)
> + readmem(task + GCORE_OFFSET(task_struct_thread_pid),
> + KVADDR, &pids_type_pid,
> + sizeof(pids_type_pid),
> + "__task_pid_nr_ns: pids_type_pid",
> + gcore_verbose_error_handle());
> + else {
> + readmem(task + OFFSET(task_struct_signal),
> + KVADDR, &signal,
> + sizeof(signal),
> + "__task_pid_nr_ns: signal",
> + gcore_verbose_error_handle());
> +
> + readmem(signal + GCORE_OFFSET(signal_struct_pids) +
> + type * sizeof(void *),
> + KVADDR, &pids_type_pid,
> + sizeof(pids_type_pid),
> + "__task_pid_nr_ns: pids_type_pid",
> + gcore_verbose_error_handle());
> + }
>
> nr = pid_nr_ns(pids_type_pid, ns);
> }
> @@ -420,9 +444,17 @@ pid_alive(ulong task)
> {
> pid_t pid;
>
> - readmem(task + OFFSET(task_struct_pids) + PIDTYPE_PID * SIZE(pid_link)
> - + OFFSET(pid_link_pid), KVADDR, &pid, sizeof(pid), "pid_alive",
> - gcore_verbose_error_handle());
> + if (VALID_MEMBER(task_struct_pids))
> + readmem(task + OFFSET(task_struct_pids) +
> + PIDTYPE_PID * SIZE(pid_link) + OFFSET(pid_link_pid),
> + KVADDR, &pid, sizeof(pid),
> + "pid_alive",
> + gcore_verbose_error_handle());
> + else
> + readmem(task + GCORE_OFFSET(task_struct_thread_pid),
> + KVADDR, &pid, sizeof(pid),
> + "task_struct.thread_pid",
> + gcore_verbose_error_handle());
>
> return !!pid;
> }
> diff --git a/libgcore/gcore_defs.h b/libgcore/gcore_defs.h
> index 18c4c2c..3c839f9 100644
> --- a/libgcore/gcore_defs.h
> +++ b/libgcore/gcore_defs.h
> @@ -1077,6 +1077,7 @@ struct gcore_offset_table
> long sched_entity_sum_exec_runtime;
> long signal_struct_cutime;
> long signal_struct_pgrp;
> + long signal_struct_pids;
> long signal_struct_session;
> long signal_struct_stime;
> long signal_struct_sum_sched_runtime;
> @@ -1090,6 +1091,7 @@ struct gcore_offset_table
> long task_struct_static_prio;
> long task_struct_uid;
> long task_struct_used_math;
> + long task_struct_thread_pid;
> long thread_info_status;
> long thread_info_fpstate;
> long thread_info_vfpstate;
> --
> 2.18.1
>
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