* bpf leaking memory
@ 2025-08-01 16:31 Jens Axboe
2025-08-01 22:41 ` Alexei Starovoitov
0 siblings, 1 reply; 3+ messages in thread
From: Jens Axboe @ 2025-08-01 16:31 UTC (permalink / raw)
To: Alexei Starovoitov, Daniel Borkmann; +Cc: open list:XDP SOCKETS (AF_XDP), LKML
Hi,
Current -git (any within the last day or two) leaks memory at boot,
as reported by kmemleak, see below. This is running debian unstable
on aarc64.
unreferenced object 0xffff0000c820d000 (size 64):
comm "systemd", pid 1, jiffies 4294667980
hex dump (first 32 bytes):
01 00 00 00 00 00 ff ff 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 84021ac):
kmemleak_alloc+0x3c/0x50
__kmalloc_node_track_caller_noprof+0x370/0x500
krealloc_noprof+0x238/0x300
kvrealloc_noprof+0x44/0x100
do_check_common+0x2668/0x2d50
bpf_check+0x2464/0x2ec0
bpf_prog_load+0x5c8/0xba8
__sys_bpf+0x9c0/0x20a0
__arm64_sys_bpf+0x24/0x60
invoke_syscall.constprop.0+0x44/0x100
el0_svc_common.constprop.0+0x3c/0xe0
do_el0_svc+0x20/0x30
el0_svc+0x30/0xe0
el0t_64_sync_handler+0x98/0xe0
el0t_64_sync+0x170/0x178
unreferenced object 0xffff0000c8ccd900 (size 64):
comm "systemd", pid 1, jiffies 4294667983
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 8e80d088):
kmemleak_alloc+0x3c/0x50
__kmalloc_node_track_caller_noprof+0x370/0x500
krealloc_noprof+0x238/0x300
kvrealloc_noprof+0x44/0x100
do_check_common+0x2668/0x2d50
bpf_check+0x2464/0x2ec0
bpf_prog_load+0x5c8/0xba8
__sys_bpf+0x9c0/0x20a0
__arm64_sys_bpf+0x24/0x60
invoke_syscall.constprop.0+0x44/0x100
el0_svc_common.constprop.0+0x3c/0xe0
do_el0_svc+0x20/0x30
el0_svc+0x30/0xe0
el0t_64_sync_handler+0x98/0xe0
el0t_64_sync+0x170/0x178
unreferenced object 0xffff0000c8fc0300 (size 64):
comm "systemd", pid 1, jiffies 4294668000
hex dump (first 32 bytes):
01 00 00 00 29 00 00 20 00 00 00 00 00 00 00 00 ....).. ........
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 335bd269):
kmemleak_alloc+0x3c/0x50
__kmalloc_node_track_caller_noprof+0x370/0x500
krealloc_noprof+0x238/0x300
kvrealloc_noprof+0x44/0x100
do_check_common+0x2668/0x2d50
bpf_check+0x2464/0x2ec0
bpf_prog_load+0x5c8/0xba8
__sys_bpf+0x9c0/0x20a0
__arm64_sys_bpf+0x24/0x60
invoke_syscall.constprop.0+0x44/0x100
el0_svc_common.constprop.0+0x3c/0xe0
do_el0_svc+0x20/0x30
el0_svc+0x30/0xe0
el0t_64_sync_handler+0x98/0xe0
el0t_64_sync+0x170/0x178
unreferenced object 0xffff0000c8c84980 (size 64):
comm "systemd", pid 1, jiffies 4294668003
hex dump (first 32 bytes):
01 00 00 00 23 00 00 00 00 00 00 00 00 00 00 00 ....#...........
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 3cc2e52e):
kmemleak_alloc+0x3c/0x50
__kmalloc_node_track_caller_noprof+0x370/0x500
krealloc_noprof+0x238/0x300
kvrealloc_noprof+0x44/0x100
do_check_common+0x2668/0x2d50
bpf_check+0x2464/0x2ec0
bpf_prog_load+0x5c8/0xba8
__sys_bpf+0x9c0/0x20a0
__arm64_sys_bpf+0x24/0x60
invoke_syscall.constprop.0+0x44/0x100
el0_svc_common.constprop.0+0x3c/0xe0
do_el0_svc+0x20/0x30
el0_svc+0x30/0xe0
el0t_64_sync_handler+0x98/0xe0
el0t_64_sync+0x170/0x178
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: bpf leaking memory
2025-08-01 16:31 bpf leaking memory Jens Axboe
@ 2025-08-01 22:41 ` Alexei Starovoitov
2025-08-01 23:26 ` Eduard Zingerman
0 siblings, 1 reply; 3+ messages in thread
From: Alexei Starovoitov @ 2025-08-01 22:41 UTC (permalink / raw)
To: Jens Axboe, Eduard
Cc: Alexei Starovoitov, Daniel Borkmann,
open list:XDP SOCKETS (AF_XDP),
LKML
On Fri, Aug 1, 2025 at 9:31 AM Jens Axboe <axboe@kernel.dk> wrote:
>
> Hi,
>
> Current -git (any within the last day or two) leaks memory at boot,
> as reported by kmemleak, see below. This is running debian unstable
> on aarc64.
>
> unreferenced object 0xffff0000c820d000 (size 64):
> comm "systemd", pid 1, jiffies 4294667980
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 ff ff 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace (crc 84021ac):
> kmemleak_alloc+0x3c/0x50
> __kmalloc_node_track_caller_noprof+0x370/0x500
> krealloc_noprof+0x238/0x300
> kvrealloc_noprof+0x44/0x100
> do_check_common+0x2668/0x2d50
> bpf_check+0x2464/0x2ec0
> bpf_prog_load+0x5c8/0xba8
Thanks for the report.
Reproed on x86 with just boot and
# echo scan > /sys/kernel/debug/kmemleak
# cat /sys/kernel/debug/kmemleak
unreferenced object 0xff1100010174d000 (size 64):
comm "systemd", pid 1, jiffies 4294669288
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 8c5ed7af):
__kmalloc_node_track_caller_noprof+0x338/0x490
krealloc_noprof+0x1db/0x2a0
kvrealloc_noprof+0x36/0xb0
do_check_common+0x2462/0x3290
bpf_check+0x2c29/0x3770
Eduard,
please take a look.
for (i = 0; i < env->scc_cnt; ++i) {
info = env->scc_info[i];
loop is wrong. Nothing updates scc_cnt.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-08-01 16:31 bpf leaking memory Jens Axboe
2025-08-01 22:41 ` Alexei Starovoitov
2025-08-01 23:26 ` Eduard Zingerman
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