Re: [bug report] blktests nvme/061 hang with rdma transport and siw driver

[Zhu Yanjun <yanjun.zhu@linux.dev>]

On 15.04.25 15:09, Bernard Metzler wrote:

> [  106.826346] rdma_rxe: loaded
> [  106.832164] loop: module loaded
> [  107.066868] run blktests nvme/061 at 2025-04-15 15:03:04
> [  107.081270] infiniband eno1_rxe: set active
> [  107.081274] infiniband eno1_rxe: added eno1
> [  107.089683] infiniband enp4s0f4d1_rxe: set active
> [  107.089687] infiniband enp4s0f4d1_rxe: added enp4s0f4d1
> [  107.264770] loop0: detected capacity change from 0 to 2097152
> [  107.267376] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
> [  107.271276] nvmet_rdma: enabling port 0 (10.0.0.2:4420)
> [  107.312957] BUG: kernel NULL pointer dereference, address: 0000000000000028
> [  107.312973] #PF: supervisor read access in kernel mode
> [  107.312979] #PF: error_code(0x0000) - not-present page
> [  107.312986] PGD 0 P4D 0
> [  107.312992] Oops: Oops: 0000 [#1] SMP PTI
> [  107.312999] CPU: 1 UID: 0 PID: 123 Comm: kworker/u32:4 Not tainted 6.15.0-rc2 #1 PREEMPT(undef)
> [  107.313008] Hardware name: LENOVO 10A6S05601/SHARKBAY, BIOS FBKTD8AUS 09/17/2019
> [  107.313016] Workqueue: rxe_wq do_work [rdma_rxe]
> [  107.313030] RIP: 0010:rxe_mr_copy+0x58/0x230 [rdma_rxe]

Hi, Bernard

An interesting test. Can you find the line number of 
(rxe_mr_copy+0x58/0x230) with crash tool?

Thus we can find what variable is becoming NULL pointer.

Thanks a lot.
Zhu Yanjun

> [  107.313041] Code: 83 7f 7c 04 49 89 f6 48 89 d3 41 89 cd 0f 84 f9 00 00 00 89 ca e8 68 f7 ff ff 85 c0 0f 85 95 01 00 00 49 8b 84 24 f0 00 00 00 <f6> 40 28 02 74 28 44 8b 45 d4 44 89 e9 48 89 da 4c 89 f6 4c 89 e7
> [  107.313055] RSP: 0018:ffffb00b40467cc8 EFLAGS: 00010246
> [  107.313062] RAX: 0000000000000000 RBX: ffff8f64434f804a RCX: 0000000000000400
> [  107.313070] RDX: 0000000000000400 RSI: ffff8f64b8c9cc00 RDI: ffff8f64bef78a00
> [  107.313077] RBP: ffffb00b40467d00 R08: 0000000000000000 R09: ffff8f6440b68e00
> [  107.313084] R10: ffffb00b40467d50 R11: ffff8f6440b68e00 R12: ffff8f64bef78a00
> [  107.313091] R13: 0000000000000400 R14: ffff8f64b8c9c800 R15: ffff8f64470d1000
> [  107.313098] FS:  0000000000000000(0000) GS:ffff8f6b8dc9e000(0000) knlGS:0000000000000000
> [  107.313106] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  107.313129] CR2: 0000000000000028 CR3: 000000069d81a004 CR4: 00000000001706f0
> [  107.313148] Call Trace:
> [  107.313164]  <TASK>
> [  107.313170]  rxe_receiver+0x1310/0x26d0 [rdma_rxe]
> [  107.313180]  do_task+0x6b/0x1f0 [rdma_rxe]
> [  107.313189]  do_work+0xe/0x20 [rdma_rxe]
> [  107.313198]  process_one_work+0x1b3/0x400
> [  107.313206]  worker_thread+0x25b/0x370
> [  107.313212]  kthread+0x116/0x240
> [  107.313218]  ? __pfx_worker_thread+0x10/0x10
> [  107.313225]  ? _raw_spin_unlock_irq+0x17/0x40
> [  107.313233]  ? __pfx_kthread+0x10/0x10
> [  107.313239]  ret_from_fork+0x3c/0x60
> [  107.313246]  ? __pfx_kthread+0x10/0x10
> [  107.313253]  ret_from_fork_asm+0x1a/0x30
> [  107.313260]  </TASK>