[bug report] kmemleak observed during blktests nvme-tcp
Yi Zhang
yi.zhang at redhat.com
Thu Apr 27 08:57:02 PDT 2023
On Thu, Apr 27, 2023 at 6:58 PM Chaitanya Kulkarni
<chaitanyak at nvidia.com> wrote:
>
> On 4/27/23 00:39, Yi Zhang wrote:
> > oops, the kmemleak still exists:
>
> hmmm, problem is I'm not able to reproduce
> nvme_ctrl_dhchap_secret_store(), I could only get
> cdev ad dev_pm_ops_xxxx. Let's see if following fixes
> nvme_ctrl_dhchap_secret_store() case ? as I've added one
> missing kfree() from earlier fix ..
Hi Chaitanya
The kmemleak in nvme_ctrl_dhchap_secret_store was fixed with the
change, feel free to add:
Tested-by: Yi Zhang <yi.zhang at redhat.com>
>
> once you confirm I'd like to send
> nvme_ctrl_dhchap_secret_store() first , meanwhile keep
> looking into cdev and dm_ops :-
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 1bfd52eae2ee..663f8c215d7b 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -3825,8 +3825,10 @@ static ssize_t
> nvme_ctrl_dhchap_secret_store(struct device *dev,
> int ret;
>
> ret = nvme_auth_generate_key(dhchap_secret, &key);
> - if (ret)
> + if (ret) {
> + kfree(dhchap_secret);
> return ret;
> + }
> kfree(opts->dhchap_secret);
> opts->dhchap_secret = dhchap_secret;
> host_key = ctrl->host_key;
> @@ -3834,7 +3836,8 @@ static ssize_t
> nvme_ctrl_dhchap_secret_store(struct device *dev,
> ctrl->host_key = key;
> mutex_unlock(&ctrl->dhchap_auth_mutex);
> nvme_auth_free_key(host_key);
> - }
> + } else
> + kfree(dhchap_secret);
> /* Start re-authentication */
> dev_info(ctrl->device, "re-authenticating controller\n");
> queue_work(nvme_wq, &ctrl->dhchap_auth_work);
> @@ -3879,8 +3882,10 @@ static ssize_t
> nvme_ctrl_dhchap_ctrl_secret_store(struct device *dev,
> int ret;
>
> ret = nvme_auth_generate_key(dhchap_secret, &key);
> - if (ret)
> + if (ret) {
> + kfree(dhchap_secret);
> return ret;
> + }
> kfree(opts->dhchap_ctrl_secret);
> opts->dhchap_ctrl_secret = dhchap_secret;
> ctrl_key = ctrl->ctrl_key;
> @@ -3888,7 +3893,8 @@ static ssize_t
> nvme_ctrl_dhchap_ctrl_secret_store(struct device *dev,
> ctrl->ctrl_key = key;
> mutex_unlock(&ctrl->dhchap_auth_mutex);
> nvme_auth_free_key(ctrl_key);
> - }
> + } else
> + kfree(dhchap_secret);
> /* Start re-authentication */
> dev_info(ctrl->device, "re-authenticating controller\n");
> queue_work(nvme_wq, &ctrl->dhchap_auth_work);
>
>
> > # cat /sys/kernel/debug/kmemleak
> > unreferenced object 0xffff8882a4cc6000 (size 4096):
> > comm "kworker/u32:6", pid 116, jiffies 4294699939 (age 1614.355s)
> > hex dump (first 32 bytes):
> > 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 03 10 03 1f 00 00 00 ................
> > backtrace:
> > [<ffffffff86564437>] kmalloc_trace+0x27/0xe0
> > [<ffffffffc08cc68e>] nvme_identify_ns+0xae/0x230 [nvme_core]
> > [<ffffffffc08cc8b9>] nvme_ns_info_from_identify+0x99/0x4a0 [nvme_core]
> > [<ffffffffc08e0696>] nvme_scan_ns+0x1b6/0x460 [nvme_core]
> > [<ffffffffc08e0ae2>] nvme_scan_ns_list+0x192/0x4f0 [nvme_core]
> > [<ffffffffc08e1271>] nvme_scan_work+0x2f1/0xa30 [nvme_core]
> > [<ffffffff85e98629>] process_one_work+0x8b9/0x1550
> > [<ffffffff85e9987c>] worker_thread+0x5ac/0xed0
> > [<ffffffff85eb2902>] kthread+0x2a2/0x340
> > [<ffffffff85c062cc>] ret_from_fork+0x2c/0x50
> > unreferenced object 0xffff88829782bc00 (size 512):
> > comm "nvme", pid 1539, jiffies 4294914967 (age 1399.449s)
> > hex dump (first 32 bytes):
> > 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
> > ff ff ff ff ff ff ff ff a0 73 bf 8d ff ff ff ff .........s......
> > backtrace:
> > [<ffffffff86564437>] kmalloc_trace+0x27/0xe0
> > [<ffffffff873658c5>] device_add+0x645/0x12f0
> > [<ffffffff867c38e3>] cdev_device_add+0xf3/0x230
> > [<ffffffffc08c77c6>] nvme_init_ctrl+0xbe6/0x1140 [nvme_core]
> > [<ffffffffc1ab0e0c>] 0xffffffffc1ab0e0c
> > [<ffffffffc0d38177>] 0xffffffffc0d38177
> > [<ffffffffc0d38613>] 0xffffffffc0d38613
> > [<ffffffff867b5056>] vfs_write+0x216/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff88824216a880 (size 96):
> > comm "nvme", pid 1539, jiffies 4294914968 (age 1399.448s)
> > hex dump (first 32 bytes):
> > 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 00 ................
> > backtrace:
> > [<ffffffff86564437>] kmalloc_trace+0x27/0xe0
> > [<ffffffff87395fa0>] dev_pm_qos_update_user_latency_tolerance+0xe0/0x200
> > [<ffffffffc08c783c>] nvme_init_ctrl+0xc5c/0x1140 [nvme_core]
> > [<ffffffffc1ab0e0c>] 0xffffffffc1ab0e0c
> > [<ffffffffc0d38177>] 0xffffffffc0d38177
> > [<ffffffffc0d38613>] 0xffffffffc0d38613
> > [<ffffffff867b5056>] vfs_write+0x216/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff8881b00f4900 (size 64):
> > comm "check", pid 1587, jiffies 4294922730 (age 1391.686s)
> > hex dump (first 32 bytes):
> > 44 48 48 43 2d 31 3a 30 30 3a 79 68 33 70 6f 45 DHHC-1:00:yh3poE
> > 61 47 37 31 68 45 69 2f 33 42 41 75 54 2f 61 6c aG71hEi/3BAuT/al
> > backtrace:
> > [<ffffffff86564d3b>] __kmalloc+0x4b/0x190
> > [<ffffffffc08d5841>] nvme_ctrl_dhchap_secret_store+0x111/0x360 [nvme_core]
> > [<ffffffff869ce038>] kernfs_fop_write_iter+0x358/0x530
> > [<ffffffff867b5642>] vfs_write+0x802/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff8882b4567700 (size 64):
> > comm "check", pid 1587, jiffies 4294922738 (age 1391.678s)
> > hex dump (first 32 bytes):
> > 44 48 48 43 2d 31 3a 30 30 3a 79 68 33 70 6f 45 DHHC-1:00:yh3poE
> > 61 47 37 31 68 45 69 2f 33 42 41 75 54 2f 61 6c aG71hEi/3BAuT/al
> > backtrace:
> > [<ffffffff86564d3b>] __kmalloc+0x4b/0x190
> > [<ffffffffc08d5841>] nvme_ctrl_dhchap_secret_store+0x111/0x360 [nvme_core]
> > [<ffffffff869ce038>] kernfs_fop_write_iter+0x358/0x530
> > [<ffffffff867b5642>] vfs_write+0x802/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff8882b6fbe000 (size 512):
> > comm "nvme", pid 1934, jiffies 4294932235 (age 1382.239s)
> > hex dump (first 32 bytes):
> > 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
> > ff ff ff ff ff ff ff ff a0 73 bf 8d ff ff ff ff .........s......
> > backtrace:
> > [<ffffffff86564437>] kmalloc_trace+0x27/0xe0
> > [<ffffffff873658c5>] device_add+0x645/0x12f0
> > [<ffffffff867c38e3>] cdev_device_add+0xf3/0x230
> > [<ffffffffc08c77c6>] nvme_init_ctrl+0xbe6/0x1140 [nvme_core]
> > [<ffffffffc1ab0e0c>] 0xffffffffc1ab0e0c
> > [<ffffffffc0d38177>] 0xffffffffc0d38177
> > [<ffffffffc0d38613>] 0xffffffffc0d38613
> > [<ffffffff867b5056>] vfs_write+0x216/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff888288a53b80 (size 96):
> > comm "nvme", pid 1934, jiffies 4294932237 (age 1382.237s)
> > hex dump (first 32 bytes):
> > 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 00 ................
> > backtrace:
> > [<ffffffff86564437>] kmalloc_trace+0x27/0xe0
> > [<ffffffff87395fa0>] dev_pm_qos_update_user_latency_tolerance+0xe0/0x200
> > [<ffffffffc08c783c>] nvme_init_ctrl+0xc5c/0x1140 [nvme_core]
> > [<ffffffffc1ab0e0c>] 0xffffffffc1ab0e0c
> > [<ffffffffc0d38177>] 0xffffffffc0d38177
> > [<ffffffffc0d38613>] 0xffffffffc0d38613
> > [<ffffffff867b5056>] vfs_write+0x216/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff88829e6a3b80 (size 64):
> > comm "check", pid 1981, jiffies 4294936167 (age 1378.307s)
> > hex dump (first 32 bytes):
> > 44 48 48 43 2d 31 3a 30 30 3a 61 56 6f 56 44 4f DHHC-1:00:aVoVDO
> > 79 69 31 6c 59 33 74 79 77 47 33 6a 4f 6e 37 33 yi1lY3tywG3jOn73
> > backtrace:
> > [<ffffffff86564d3b>] __kmalloc+0x4b/0x190
> > [<ffffffffc08d5841>] nvme_ctrl_dhchap_secret_store+0x111/0x360 [nvme_core]
> > [<ffffffff869ce038>] kernfs_fop_write_iter+0x358/0x530
> > [<ffffffff867b5642>] vfs_write+0x802/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> > unreferenced object 0xffff88829e6a3a80 (size 64):
> > comm "check", pid 1981, jiffies 4294936885 (age 1377.589s)
> > hex dump (first 32 bytes):
> > 44 48 48 43 2d 31 3a 30 30 3a 61 56 6f 56 44 4f DHHC-1:00:aVoVDO
> > 79 69 31 6c 59 33 74 79 77 47 33 6a 4f 6e 37 33 yi1lY3tywG3jOn73
> > backtrace:
> > [<ffffffff86564d3b>] __kmalloc+0x4b/0x190
> > [<ffffffffc08d5841>] nvme_ctrl_dhchap_secret_store+0x111/0x360 [nvme_core]
> > [<ffffffff869ce038>] kernfs_fop_write_iter+0x358/0x530
> > [<ffffffff867b5642>] vfs_write+0x802/0xc60
> > [<ffffffff867b62e9>] ksys_write+0xf9/0x1d0
> > [<ffffffff881adc4c>] do_syscall_64+0x5c/0x90
> > [<ffffffff882000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> >
> >
>
> [..]
>
> -ck
>
>
--
Best Regards,
Yi Zhang
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