The option 'log_buf_len' in the kernel command line will make kernel dynamically allocate memory (system ram) from memblock and always hold the memory allocated. If the size of this option is misused such as 'log_buf_len=64M'. This may cause a short of memory for kdump kernel, because the size of memory is usually limited in kdump kernel.
In order to avoid this problem, need to remove this option from the kdump kernel command line.
Signed-off-by: Lianbo Jiang lijiang@redhat.com --- kdump.sysconfig | 2 +- kdump.sysconfig.aarch64 | 2 +- kdump.sysconfig.i386 | 2 +- kdump.sysconfig.ppc64 | 2 +- kdump.sysconfig.ppc64le | 2 +- kdump.sysconfig.s390x | 2 +- kdump.sysconfig.x86_64 | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/kdump.sysconfig b/kdump.sysconfig index df518d64afd8..7c5641a6d8ac 100644 --- a/kdump.sysconfig +++ b/kdump.sysconfig @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 index d5d762436eca..cbe611869e65 100644 --- a/kdump.sysconfig.aarch64 +++ b/kdump.sysconfig.aarch64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386 index c31a8cbe3077..61d940718c66 100644 --- a/kdump.sysconfig.i386 +++ b/kdump.sysconfig.i386 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64 index 1f954521fd6d..6c091a74a74f 100644 --- a/kdump.sysconfig.ppc64 +++ b/kdump.sysconfig.ppc64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le index 1f954521fd6d..6c091a74a74f 100644 --- a/kdump.sysconfig.ppc64le +++ b/kdump.sysconfig.ppc64le @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x index abd45a2f332d..958eb8f24ca3 100644 --- a/kdump.sysconfig.s390x +++ b/kdump.sysconfig.s390x @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64 index a43a97062500..95a26a4d0833 100644 --- a/kdump.sysconfig.x86_64 +++ b/kdump.sysconfig.x86_64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE
On 05/22/2020 02:45 PM, Lianbo Jiang wrote:
The option 'log_buf_len' in the kernel command line will make kernel dynamically allocate memory (system ram) from memblock and always hold the memory allocated. If the size of this option is misused such as 'log_buf_len=64M'. This may cause a short of memory for kdump kernel, because the size of memory is usually limited in kdump kernel.
In order to avoid this problem, need to remove this option from the kdump kernel command line.
Signed-off-by: Lianbo Jiang lijiang@redhat.com
kdump.sysconfig | 2 +- kdump.sysconfig.aarch64 | 2 +- kdump.sysconfig.i386 | 2 +- kdump.sysconfig.ppc64 | 2 +- kdump.sysconfig.ppc64le | 2 +- kdump.sysconfig.s390x | 2 +- kdump.sysconfig.x86_64 | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/kdump.sysconfig b/kdump.sysconfig index df518d64afd8..7c5641a6d8ac 100644 --- a/kdump.sysconfig +++ b/kdump.sysconfig @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 index d5d762436eca..cbe611869e65 100644 --- a/kdump.sysconfig.aarch64 +++ b/kdump.sysconfig.aarch64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386 index c31a8cbe3077..61d940718c66 100644 --- a/kdump.sysconfig.i386 +++ b/kdump.sysconfig.i386 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64 index 1f954521fd6d..6c091a74a74f 100644 --- a/kdump.sysconfig.ppc64 +++ b/kdump.sysconfig.ppc64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le index 1f954521fd6d..6c091a74a74f 100644 --- a/kdump.sysconfig.ppc64le +++ b/kdump.sysconfig.ppc64le @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x index abd45a2f332d..958eb8f24ca3 100644 --- a/kdump.sysconfig.s390x +++ b/kdump.sysconfig.s390x @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64 index a43a97062500..95a26a4d0833 100644 --- a/kdump.sysconfig.x86_64 +++ b/kdump.sysconfig.x86_64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len"
# This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE
Acked-by: Pingfan Liu piliu@redhat.com
-
Lianbo Jiang -
piliu