Re: [PATCH blktests v2 2/2] [NOT-FOR-MERGE] just for testing

Zhijian Li (Fujitsu)
2024-12-27T05:37:45Z

Hi, Shin'ichiro,

Your attached kconfig+this rnbd test triggered another BUG.

Cced: RDMA

Is this a known issue in RDMA/RXE communities?

On 26/12/2024 21:17, Shinichiro Kawasaki wrote:
> On Dec 25, 2024 / 17:37, Li Zhijian wrote:
>> Hi, Shin'ichiro
>>
>> All your comments has been addressed except the success ratio one. Could
>> you help to check this patch([NOT-FOR-MERGE] just for testing) that can tell
>> where it fails at in your envrionment.
>>
>> I tested it today in my QEMU enviroment, It almost 100% success
>
> Thanks for this effort. I ran rnbd/001 with this series in my QEMU environment.
> It looks still failing. Please find the 001.out.bad file generated [X]. The
> kernel was v6.13-rc4 with the fix patch "RDMA/ulp: Add missing deinit() call".
>
> I wonder what is the difference between your environment and mine. FYI, my QEMU
> environment has 4 CPUs and 16GB DRAM. It runs Fedora 40. I also attach the
> kernel config I used just in case you are interested in.

Due to this bug, I cannot finish rnbd/001 at all.

However, I can reproduce your log by adding `_start_rnbd_client` before the iteration.
And it can be fixed by calling `_stop_rnbd_client` regardless of whether `_start_rnbd_client`
succeeds or not(Please feel free to give it a try when you have the opportunity).

diff --git a/tests/rnbd/001 b/tests/rnbd/001
index 9c6d56e3ee98..321c4c010e78 100755
--- a/tests/rnbd/001
+++ b/tests/rnbd/001
@@ -26,6 +26,7 @@ test_start_stop()
local loop_dev i j=0
loop_dev="$(losetup -f)"

+ _start_rnbd_client # this makes the _start_rnbd_client in below iteration fails
for ((i=0;i<100;i++))
do
if _start_rnbd_client "${loop_dev}" &>/dev/null; then
@@ -33,6 +34,7 @@ test_start_stop()
_stop_rnbd_client &>/dev/null && echo 'disconnect ok' || echo 'disconnect not ok'
((j++))
else
+ _stop_rnbd_client # always stop rnbd so that we can connect again.
echo 'connect not ok'
fi
done

===========================

[ 27.864420] run blktests rnbd/001 at 2024-12-27 13:21:37
[ 27.888742] infiniband eth0_rxe: set active
[ 27.889497] infiniband eth0_rxe: added eth0
[ 27.910304] rnbd_client L599: Mapping device /dev/loop0 on session blktest, (access_mode: rw, nr_poll_queues: 0)
[ 27.924065] rnbd_client L1190: [session=blktest] mapped 4/4 default/read queues.
[ 27.925825] rnbd_server L782: </dev/loop0@blktest>: Opened device 'loop0'
[ 27.927554] rnbd_client L1612: </dev/loop0@blktest> map_device: Device mapped as rnbd0 (nsectors: 0, logical_block_size: 512, physical_block_size: 512, max_write_zeroes_sectors: 0, max_discard_sectors: 0, discard_granularity: 51
2, discard_alignment: 0, secure_discard: 0, max_segments: 128, max_hw_sectors: 248, wc: 0, fua: 0)
[ 27.938295] rnbd_client L323: </dev/loop0@blktest> Unmapping device, option: normal.
[ 27.962570] rnbd_server L238: </dev/loop0@blktest>: Device closed
[ 27.967500] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 27.967500] BUG: kernel NULL pointer dereference, address: 0000000000000000 13:21:38 [11/9189]
[ 27.976554] #PF: supervisor read access in kernel mode
[ 27.984926] #PF: error_code(0x0000) - not-present page
[ 27.989126] PGD 0 P4D 0
[ 27.991067] Oops: Oops: 0000 [#1] PREEMPT SMP PTI
[ 27.993226] CPU: 3 UID: 0 PID: 304 Comm: kworker/u20:2 Not tainted 6.13.0-rc3+ #1
[ 27.996697] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 27.999333] Workqueue: rxe_wq do_work [rdma_rxe]
[ 28.000309] RIP: 0010:memcpy_orig+0xd5/0x140
[ 28.001304] Code: 16 f8 4c 89 07 4c 89 4f 08 4c 89 54 17 f0 4c 89 5c 17 f8 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 fa 08 72 1b <4c> 8b 06 4c 8b 4c 16 f8 4c 89 07 4c 89 4c 17 f8 c3 cc cc cc cc 66
[ 28.004932] RSP: 0018:ffffb934c0643cc0 EFLAGS: 00010246
[ 28.005845] RAX: ffff976bc1e12d5a RBX: 0000000000000000 RCX: 0000000000000000
[ 28.007090] RDX: 0000000000000008 RSI: 0000000000000000 RDI: ffff976bc1e12d5a
[ 28.008380] RBP: ffff976bc1e12d5a R08: 0000000000000001 R09: 0000000000000001
[ 28.009639] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000080000000
[ 28.010836] R13: 0000000000000008 R14: 0000000000000008 R15: 0000000000000008
[ 28.011948] FS: 0000000000000000(0000) GS:ffff976f2fd80000(0000) knlGS:0000000000000000
[ 28.013335] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.014275] CR2: 0000000000000000 CR3: 00000001837da002 CR4: 00000000001706f0
[ 28.015424] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 28.016598] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 28.017728] Call Trace:
[ 28.018114] <TASK>
[ 28.018453] ? __die_body.cold+0x19/0x27
[ 28.019167] ? page_fault_oops+0x15a/0x2d0
[ 28.019861] ? search_module_extables+0x19/0x60
[ 28.020617] ? search_bpf_extables+0x5f/0x80
[ 28.021611] ? exc_page_fault+0x7e/0x180
[ 28.022488] ? asm_exc_page_fault+0x26/0x30
[ 28.023547] ? memcpy_orig+0xd5/0x140
[ 28.024396] rxe_mr_copy+0x1c3/0x200 [rdma_rxe]
[ 28.025476] ? rxe_pool_get_index+0x4b/0x80 [rdma_rxe]
[ 28.026612] copy_data+0xa5/0x230 [rdma_rxe]
[ 28.027611] rxe_requester+0xd9b/0xf70 [rdma_rxe]
[ 28.028727] ? finish_task_switch.isra.0+0x99/0x2e0
[ 28.029878] rxe_sender+0x13/0x40 [rdma_rxe]
[ 28.030920] do_task+0x68/0x1e0 [rdma_rxe]
[ 28.031893] process_one_work+0x177/0x330
[ 28.032854] worker_thread+0x252/0x390
[ 28.033748] ? __pfx_worker_thread+0x10/0x10
[ 28.034665] kthread+0xd2/0x100
[ 28.035382] ? __pfx_kthread+0x10/0x10
[ 28.036252] ret_from_fork+0x34/0x50
[ 28.037220] ? __pfx_kthread+0x10/0x10
[ 28.038072] ret_from_fork_asm+0x1a/0x30
[ 28.038991] </TASK>
[ 28.039543] Modules linked in: loop rnbd_client rtrs_client rnbd_server rtrs_server rtrs_core rdma_cm iw_cm ib_cm rdma_rxe ib_uverbs ib_core ip6_udp_tunnel udp_tunnel rfkill intel_rapl_msr intel_rapl_common kmem rapl cxl_mem iTC
O_wdt intel_pmc_bxt cxl_pmem dax_hmem iTCO_vendor_support device_dax cxl_acpi cxl_pci cxl_port joydev qxl cxl_core pcspkr drm_ttm_helper lpc_ich ttm i2c_i801 virtio_balloon i2c_smbus nd_pmem nd_btt dax_pmem einj ip_tables crct10dif
_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel sha512_ssse3 sha256_ssse3 sha1_ssse3 virtiofs fuse virtio_net nfit virtio_console net_failover libnvdimm serio_raw virtio_blk failover qemu_fw_cf
g dm_multipath sunrpc
[ 28.051034] CR2: 0000000000000000
[ 28.052072] ---[ end trace 0000000000000000 ]---
[ 28.053099] RIP: 0010:memcpy_orig+0xd5/0x140
[ 28.054188] Code: 16 f8 4c 89 07 4c 89 4f 08 4c 89 54 17 f0 4c 89 5c 17 f8 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 fa 08 72 1b <4c> 8b 06 4c 8b 4c 16 f8 4c 89 07 4c 89 4c 17 f8 c3 cc cc cc cc 66
[ 28.058290] RSP: 0018:ffffb934c0643cc0 EFLAGS: 00010246
[ 28.059514] RAX: ffff976bc1e12d5a RBX: 0000000000000000 RCX: 0000000000000000
[ 28.061194] RDX: 0000000000000008 RSI: 0000000000000000 RDI: ffff976bc1e12d5a
[ 28.062588] RBP: ffff976bc1e12d5a R08: 0000000000000001 R09: 0000000000000001

>
>
> [X]
>
> 001.out.bad
> ----------------------------------------------------------------------------
> Running rnbd/001
> connect ok
> disconnect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> connect not ok
> Failed: 1/100
> Test complete