From: Harald Freudenberger <freude@linux.ibm.com>
To: Yi Zhang <yi.zhang@redhat.com>
Cc: linux-s390@vger.kernel.org, dengler@linux.ibm.com
Subject: Re: [bug report] kmemleak observed on zcrypt module after system boots up
Date: Mon, 02 Feb 2026 17:44:45 +0100 [thread overview]
Message-ID: <c48e86de56db100cad87bb32f077bcae@linux.ibm.com> (raw)
In-Reply-To: <CAHj4cs_GH0O7-nkh=8EhwscjzesawBJ+6b0MxuWZOOsp4B7HsA@mail.gmail.com>
On 2026-01-30 09:23, Yi Zhang wrote:
> Hi
> I found this kmemleak issue after the system boots up with
> linux-block/for-next, please help check it and let me know if you need
> any test/info.
>
> # uname -r
> 6.19.0-rc7+
> # dmesg | grep kmemleak
> [ 1648.765780] kmemleak: 1 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
> [ 6148.698090] kmemleak: 2 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
> [10419.366662] kmemleak: 3 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
> [14843.424498] kmemleak: 2 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
> [20987.442195] kmemleak: 2 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
>
> # cat /sys/kernel/debug/kmemleak
> unreferenced object 0x990d0000 (size 12288):
> comm "dnf", pid 48539, jiffies 4296356469
> hex dump (first 32 bytes):
> 00 00 00 00 99 0d 36 30 00 00 bb af 00 f7 1d 60 ......60.......`
> 00 00 00 00 99 0d 00 10 00 00 00 00 99 0d 00 10 ................
> backtrace (crc 9893fb1d):
> kmemleak_alloc+0x6c/0xc0
> ___kmalloc_large_node+0x106/0x160
> __kmalloc_large_node_noprof+0x32/0x170
> __kmalloc_noprof+0x6d8/0xa00
> ap_init_apmsg+0xf6/0x190
> zcrypt_rsa_modexpo+0x15c/0x1310 [zcrypt]
> icarsamodexpo_ioctl+0x110/0x270 [zcrypt]
> zcrypt_unlocked_ioctl+0xc60/0x10e0 [zcrypt]
> __s390x_sys_ioctl+0x178/0x1e0
> __do_syscall+0x166/0x460
> system_call+0x6e/0x90
> unreferenced object 0xae148000 (size 12288):
> comm "dnf", pid 48539, jiffies 4296356470
> hex dump (first 32 bytes):
> 00 00 00 00 ae 14 b6 30 00 00 bb af 00 f7 1d 60 .......0.......`
> 00 00 00 00 ae 14 80 10 00 00 00 00 ae 14 80 10 ................
> backtrace (crc 41938ebb):
> kmemleak_alloc+0x6c/0xc0
> ___kmalloc_large_node+0x106/0x160
> __kmalloc_large_node_noprof+0x32/0x170
> __kmalloc_noprof+0x6d8/0xa00
> ap_init_apmsg+0xf6/0x190
> zcrypt_rsa_modexpo+0x15c/0x1310 [zcrypt]
> icarsamodexpo_ioctl+0x110/0x270 [zcrypt]
> zcrypt_unlocked_ioctl+0xc60/0x10e0 [zcrypt]
> __s390x_sys_ioctl+0x178/0x1e0
> __do_syscall+0x166/0x460
> system_call+0x6e/0x90
> unreferenced object 0x87dd4000 (size 12288):
> comm "dnf", pid 48633, jiffies 4296914470
> hex dump (first 32 bytes):
> 00 00 00 00 94 c7 20 00 00 00 00 00 00 fe 90 80 ...... .........
> ff ff ff ff ff ff ff ff 00 10 63 c9 1e a5 48 b8 ..........c...H.
> backtrace (crc fb3113e3):
> kmemleak_alloc+0x6c/0xc0
> ___kmalloc_large_node+0x106/0x160
> __kmalloc_large_node_noprof+0x32/0x170
> __kmalloc_noprof+0x6d8/0xa00
> ap_init_apmsg+0xf6/0x190
> zcrypt_rsa_modexpo+0x15c/0x1310 [zcrypt]
> icarsamodexpo_ioctl+0x110/0x270 [zcrypt]
> zcrypt_unlocked_ioctl+0xc60/0x10e0 [zcrypt]
> __s390x_sys_ioctl+0x178/0x1e0
> __do_syscall+0x166/0x460
> system_call+0x6e/0x90
> unreferenced object 0x8e65c000 (size 12288):
> comm "dnf", pid 48633, jiffies 4296914470
> hex dump (first 32 bytes):
> 00 00 00 00 aa 22 2e 00 00 00 00 00 00 fe 90 80 ....."..........
> ff ff ff ff ff ff ff ff 00 10 63 c9 1e a5 48 b8 ..........c...H.
> backtrace (crc 1b33772d):
> kmemleak_alloc+0x6c/0xc0
> ___kmalloc_large_node+0x106/0x160
> __kmalloc_large_node_noprof+0x32/0x170
> __kmalloc_noprof+0x6d8/0xa00
> ap_init_apmsg+0xf6/0x190
> zcrypt_rsa_modexpo+0x15c/0x1310 [zcrypt]
> icarsamodexpo_ioctl+0x110/0x270 [zcrypt]
> zcrypt_unlocked_ioctl+0xc60/0x10e0 [zcrypt]
> __s390x_sys_ioctl+0x178/0x1e0
> __do_syscall+0x166/0x460
> system_call+0x6e/0x90--
>
>
>
> Best Regards,
> Yi Zhang
Hello Yi Zhang
I tried to reproduce this on the linux-next kernel as of today and on
the (IBM internal current development kernel). In both cases I could
not reproduce this. You mention linux-block, did you see this on
linux-next also ?
Thanks
Harald Freudenberger
next prev parent reply other threads:[~2026-02-02 16:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-30 8:23 [bug report] kmemleak observed on zcrypt module after system boots up Yi Zhang
2026-02-02 16:44 ` Harald Freudenberger [this message]
2026-02-04 10:18 ` Harald Freudenberger
2026-02-04 11:47 ` Yi Zhang
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