When I run `crash /proc/kcore` to check the leak object pointer, I got this. Is there anything else I can offer ?
crash> struct alien_cache -x 0xffff88f914ddc180
struct alien_cache {
lock = {
{
rlock = {
raw_lock = {
val = {
counter = 0x0
}
}
}
}
},
ac = {
avail = 0x0,
limit = 0xc,
batchcount = 0xbaadf00d,
touched = 0x0,
entry = 0xffff88f914ddc198
}
}
Sincerely
At 2018-11-16 10:23:03, "dong" <bauers@xxxxxxx> wrote:
When I straced systemd, I found the weird system call ‘kcmp’. Is that can explain something?% time seconds usecs/call calls errors syscall------ ----------- ----------- --------- --------- ----------------29.06 0.000077 19 4 close16.98 0.000045 23 2 read15.47 0.000041 21 2 open10.94 0.000029 15 2 recvmsg9.43 0.000025 6 4 epoll_wait9.06 0.000024 6 4 epoll_ctl6.42 0.000017 0 54 kcmp2.26 0.000006 2 4 clock_gettime0.38 0.000001 1 2 fstat------ ----------- ----------- --------- --------- ----------------100.00 0.000265 78 totalSincerely
At 2018-11-16 05:06:46, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > >(switched to email. Please respond via emailed reply-to-all, not via the >bugzilla web interface). > >On Thu, 15 Nov 2018 06:31:19 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > >> https://bugzilla.kernel.org/show_bug.cgi?id=201699 >> >> Bug ID: 201699 >> Summary: kmemleak in memcg_create_kmem_cache >> Product: Memory Management >> Version: 2.5 >> Kernel Version: 4.20.0-rc2（other version include 4.14.52 etc.） >> Hardware: Intel >> OS: Linux >> Tree: Mainline >> Status: NEW >> Severity: high >> Priority: P1 >> Component: Slab Allocator >> Assignee: akpm@xxxxxxxxxxxxxxxxxxxx >> Reporter: bauers@xxxxxxx >> Regression: No >> >> On debian OS, when systemd restart a failed service periodically. It will cause >> memory leak. When I enable kmemleak, the message comes up. >> >> >> [ 4658.065578] kmemleak: Found object by alias at 0xffff9d84ba868808 >> [ 4658.065581] CPU: 8 PID: 5194 Comm: kworker/8:3 Not tainted 4.20.0-rc2.bm.1+ >> #1 >> [ 4658.065582] Hardware name: Dell Inc. PowerEdge C6320/082F9M, BIOS 2.1.5 >> 04/12/2016 >> [ 4658.065586] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func >> [ 4658.065587] Call Trace: >> [ 4658.065590] dump_stack+0x5c/0x7b >> [ 4658.065594] lookup_object+0x5e/0x80 >> [ 4658.065596] find_and_get_object+0x29/0x80 >> [ 4658.065598] kmemleak_no_scan+0x31/0xc0 >> [ 4658.065600] setup_kmem_cache_node+0x271/0x350 >> [ 4658.065602] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065603] do_tune_cpucache+0x27/0xb0 >> [ 4658.065605] enable_cpucache+0x80/0x110 >> [ 4658.065606] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065609] ? kmem_cache_alloc+0x1aa/0x280 >> [ 4658.065612] create_cache+0xd9/0x200 >> [ 4658.065614] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065616] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065619] process_one_work+0x1d1/0x3d0 >> [ 4658.065621] worker_thread+0x4f/0x3b0 >> [ 4658.065623] ? rescuer_thread+0x360/0x360 >> [ 4658.065625] kthread+0xf8/0x130 >> [ 4658.065627] ? kthread_create_worker_on_cpu+0x70/0x70 >> [ 4658.065628] ret_from_fork+0x35/0x40 >> [ 4658.065630] kmemleak: Object 0xffff9d84ba868800 (size 128): >> [ 4658.065631] kmemleak: comm "kworker/8:3", pid 5194, jiffies 4296056196 >> [ 4658.065631] kmemleak: min_count = 1 >> [ 4658.065632] kmemleak: count = 0 >> [ 4658.065632] kmemleak: flags = 0x1 >> [ 4658.065633] kmemleak: checksum = 0 >> [ 4658.065633] kmemleak: backtrace: >> [ 4658.065635] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065636] do_tune_cpucache+0x27/0xb0 >> [ 4658.065637] enable_cpucache+0x80/0x110 >> [ 4658.065638] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065640] create_cache+0xd9/0x200 >> [ 4658.065641] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065642] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065644] process_one_work+0x1d1/0x3d0 >> [ 4658.065646] worker_thread+0x4f/0x3b0 >> [ 4658.065647] kthread+0xf8/0x130 >> [ 4658.065648] ret_from_fork+0x35/0x40 >> [ 4658.065649] 0xffffffffffffffff >> [ 4658.065650] kmemleak: Not scanning unknown object at 0xffff9d84ba868808 >> [ 4658.065651] CPU: 8 PID: 5194 Comm: kworker/8:3 Not tainted 4.20.0-rc2.bm.1+ >> #1 >> [ 4658.065652] Hardware name: Dell Inc. PowerEdge C6320/082F9M, BIOS 2.1.5 >> 04/12/2016 >> [ 4658.065653] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func >> [ 4658.065654] Call Trace: >> [ 4658.065656] dump_stack+0x5c/0x7b >> [ 4658.065657] kmemleak_no_scan+0xa0/0xc0 >> [ 4658.065659] setup_kmem_cache_node+0x271/0x350 >> [ 4658.065660] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065662] do_tune_cpucache+0x27/0xb0 >> [ 4658.065663] enable_cpucache+0x80/0x110 >> [ 4658.065664] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065667] ? kmem_cache_alloc+0x1aa/0x280 >> [ 4658.065668] create_cache+0xd9/0x200 >> [ 4658.065670] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065671] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065673] process_one_work+0x1d1/0x3d0 >> [ 4658.065675] worker_thread+0x4f/0x3b0 >> [ 4658.065677] ? rescuer_thread+0x360/0x360 >> [ 4658.065679] kthread+0xf8/0x130 >> [ 4658.065681] ? kthread_create_worker_on_cpu+0x70/0x70 >> [ 4658.065682] ret_from_fork+0x35/0x40 >> [ 4658.065718] kmemleak: Found object by alias at 0xffff9d8cb36bd288 >> [ 4658.065720] CPU: 8 PID: 5194 Comm: kworker/8:3 Not tainted 4.20.0-rc2.bm.1+ >> #1 >> [ 4658.065721] Hardware name: Dell Inc. PowerEdge C6320/082F9M, BIOS 2.1.5 >> 04/12/2016 >> [ 4658.065722] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func >> [ 4658.065722] Call Trace: >> [ 4658.065724] dump_stack+0x5c/0x7b >> [ 4658.065726] lookup_object+0x5e/0x80 >> [ 4658.065728] find_and_get_object+0x29/0x80 >> [ 4658.065729] kmemleak_no_scan+0x31/0xc0 >> [ 4658.065730] setup_kmem_cache_node+0x271/0x350 >> [ 4658.065732] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065734] do_tune_cpucache+0x27/0xb0 >> [ 4658.065735] enable_cpucache+0x80/0x110 >> [ 4658.065737] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065739] ? kmem_cache_alloc+0x1aa/0x280 >> [ 4658.065740] create_cache+0xd9/0x200 >> [ 4658.065742] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065743] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065745] process_one_work+0x1d1/0x3d0 >> [ 4658.065747] worker_thread+0x4f/0x3b0 >> [ 4658.065750] ? rescuer_thread+0x360/0x360 >> [ 4658.065751] kthread+0xf8/0x130 >> [ 4658.065753] ? kthread_create_worker_on_cpu+0x70/0x70 >> [ 4658.065754] ret_from_fork+0x35/0x40 >> [ 4658.065755] kmemleak: Object 0xffff9d8cb36bd280 (size 128): >> [ 4658.065756] kmemleak: comm "kworker/8:3", pid 5194, jiffies 4296056196 >> [ 4658.065757] kmemleak: min_count = 1 >> [ 4658.065757] kmemleak: count = 0 >> [ 4658.065757] kmemleak: flags = 0x1 >> [ 4658.065758] kmemleak: checksum = 0 >> [ 4658.065758] kmemleak: backtrace: >> [ 4658.065759] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065760] do_tune_cpucache+0x27/0xb0 >> [ 4658.065762] enable_cpucache+0x80/0x110 >> [ 4658.065763] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065764] create_cache+0xd9/0x200 >> [ 4658.065765] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065766] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065768] process_one_work+0x1d1/0x3d0 >> [ 4658.065770] worker_thread+0x4f/0x3b0 >> [ 4658.065771] kthread+0xf8/0x130 >> [ 4658.065772] ret_from_fork+0x35/0x40 >> [ 4658.065773] 0xffffffffffffffff >> [ 4658.065774] kmemleak: Not scanning unknown object at 0xffff9d8cb36bd288 >> [ 4658.065775] CPU: 8 PID: 5194 Comm: kworker/8:3 Not tainted 4.20.0-rc2.bm.1+ >> #1 >> [ 4658.065775] Hardware name: Dell Inc. PowerEdge C6320/082F9M, BIOS 2.1.5 >> 04/12/2016 >> [ 4658.065776] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func >> [ 4658.065777] Call Trace: >> [ 4658.065779] dump_stack+0x5c/0x7b >> [ 4658.065780] kmemleak_no_scan+0xa0/0xc0 >> [ 4658.065781] setup_kmem_cache_node+0x271/0x350 >> [ 4658.065783] __do_tune_cpucache+0x18c/0x220 >> [ 4658.065784] do_tune_cpucache+0x27/0xb0 >> [ 4658.065785] enable_cpucache+0x80/0x110 >> [ 4658.065787] __kmem_cache_create+0x217/0x3a0 >> [ 4658.065789] ? kmem_cache_alloc+0x1aa/0x280 >> [ 4658.065790] create_cache+0xd9/0x200 >> [ 4658.065792] memcg_create_kmem_cache+0xef/0x120 >> [ 4658.065793] memcg_kmem_cache_create_func+0x1b/0x60 >> [ 4658.065795] process_one_work+0x1d1/0x3d0 >> [ 4658.065797] worker_thread+0x4f/0x3b0 >> [ 4658.065799] ? rescuer_thread+0x360/0x360 >> [ 4658.065801] kthread+0xf8/0x130 >> [ 4658.065802] ? kthread_create_worker_on_cpu+0x70/0x70 >> [ 4658.065804] ret_from_fork+0x35/0x40 >> >> -- >> You are receiving this mail because: >> You are the assignee for the bug.
