On Fri, Mar 31, 2023 at 11:08:23AM -0600, jim.cromie@xxxxxxxxx wrote:
> :#> uptime
> 09:45:32 up 1 day, 23:07, 0 users, load average: 0.07, 0.04, 0.01
> :#> uname -a
> Linux (none) 6.3.0-rc1-f2-00001-gac3b43283923 #359 SMP PREEMPT_DYNAMIC
> Wed Mar 29 09:33:11 MDT 2023 x86_64 x86_64 x86_64 GNU/Linux
>
> the leaks I sent previously might be from/on a different commit,
> heres the relevant one
>
> fwiw, the config is unremarkable. it started with
> CONFIG_BUILD_SALT="5.16.8-200.fc35.x86_64"
> then `make localmodconfig` to drop anything I dont have hw for
> then `virtme-configkernel --update` to pick up the 9p,etc config options
> And some extra DEBUG_* options
> If you'd like to see runs with others, or see the config itself, please ask.
If you wanna see things explode
echo 0 > /proc/sys/vm/oom_dump_tasks
./stress-ng --module 20 --module-name xfs
This assumes xfs is not already loaded, and has all dependencies already
loaded. What would test the load_module() path.
If you wanna see if the test is earlier, you can try a module which
is already loaded on your system.
> :#> uname -a
> Linux (none) 6.3.0-rc1-f2-00001-gac3b43283923 #359 SMP PREEMPT_DYNAMIC
> Wed Mar 29 09:33:11 MDT 2023 x86_64 x86_64 x86_64 GNU/Linux
> :#> ./grok_kmemleak -n
> not: bless( {
> 'backtraces' => {
> '[<0000000058fb276d>] __kmalloc_node_track_caller+0x4a/0x140
> [<00000000a2f80203>] memdup_user+0x26/0x90
> [<00000000f7cd3624>] strndup_user+0x3f/0x60
> [<0000000098fd26c5>] load_module+0x188b/0x20e0
Can you do:
gdb vmlinux
l *(load_module+0x188b)
And provide the output?
> }, 'LeakSet' )
> mods: bless( {
> 'backtraces' => {
> '[<0000000058fb276d>] __kmalloc_node_track_caller+0x4a/0x140
> [<00000000ab7b01fd>] kstrdup+0x32/0x60
> [<000000005ed25b98>] kobject_set_name_vargs+0x1c/0x90
> [<0000000090fe19ca>] kobject_init_and_add+0x4d/0x90
> [<0000000045666935>] mod_sysfs_setup+0xa9/0x6e0
Ok that is a specific enough hint. I'll take a review of this sysfs
path see what changed that could break.
> [<00000000d6f7187b>] load_module+0x1de3/0x20e0
> [<0000000074361279>] __do_sys_finit_module+0x93/0xf0
> [<000000004caeb948>] do_syscall_64+0x34/0x80
> [<000000009f5d036c>] entry_SYSCALL_64_after_hwframe+0x46/0xb0' => 16
> },
Luis
