diff options
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 1 | ||||
| -rw-r--r-- | Documentation/admin-guide/sysctl/kernel.rst | 1 | ||||
| -rw-r--r-- | kernel/panic.c | 4 |
3 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 31b3a25680d0..800b4b5dcbb4 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4182,6 +4182,7 @@ bit 4: print ftrace buffer bit 5: print all printk messages in buffer bit 6: print all CPUs backtrace (if available in the arch) + bit 7: print only tasks in uninterruptible (blocked) state *Be aware* that this option may print a _lot_ of lines, so there are risks of losing older messages in the log. Use this option carefully, maybe worth to setup a diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index bc578663619d..a9b71190399d 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -853,6 +853,7 @@ bit 3 print locks info if ``CONFIG_LOCKDEP`` is on bit 4 print ftrace buffer bit 5 print all printk messages in buffer bit 6 print all CPUs backtrace (if available in the arch) +bit 7 print only tasks in uninterruptible (blocked) state ===== ============================================ So for example to print tasks and memory info on panic, user can:: diff --git a/kernel/panic.c b/kernel/panic.c index d49b68184c56..d4cb86d97f8f 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -73,6 +73,7 @@ EXPORT_SYMBOL_GPL(panic_timeout); #define PANIC_PRINT_FTRACE_INFO 0x00000010 #define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020 #define PANIC_PRINT_ALL_CPU_BT 0x00000040 +#define PANIC_PRINT_BLOCKED_TASKS 0x00000080 unsigned long panic_print; ATOMIC_NOTIFIER_HEAD(panic_notifier_list); @@ -227,6 +228,9 @@ static void panic_print_sys_info(bool console_flush) if (panic_print & PANIC_PRINT_FTRACE_INFO) ftrace_dump(DUMP_ALL); + + if (panic_print & PANIC_PRINT_BLOCKED_TASKS) + show_state_filter(TASK_UNINTERRUPTIBLE); } void check_panic_on_warn(const char *origin) |