On 6/12/2025 4:45 PM, Sergey Senozhatsky wrote:
> In a number of cases we see kernel panics on resume due
> to ath11k kernel page fault, which happens under the
> following circumstances:
>
> 1) First ath11k_hal_dump_srng_stats() call
>
> Last interrupt received for each group:
> ath11k_pci 0000:01:00.0: group_id 0 22511ms before
> ath11k_pci 0000:01:00.0: group_id 1 14440788ms before
> [..]
> ath11k_pci 0000:01:00.0: failed to receive control response completion, polling..
> ath11k_pci 0000:01:00.0: Service connect timeout
> ath11k_pci 0000:01:00.0: failed to connect to HTT: -110
> ath11k_pci 0000:01:00.0: failed to start core: -110
> ath11k_pci 0000:01:00.0: firmware crashed: MHI_CB_EE_RDDM
> ath11k_pci 0000:01:00.0: already resetting count 2
> ath11k_pci 0000:01:00.0: failed to wait wlan mode request (mode 4): -110
> ath11k_pci 0000:01:00.0: qmi failed to send wlan mode off: -110
> ath11k_pci 0000:01:00.0: failed to reconfigure driver on crash recovery
> [..]
>
> 2) At this point reconfiguration fails (we have 2 resets) and
> ath11k_core_reconfigure_on_crash() calls ath11k_hal_srng_deinit()
> which destroys srng lists. However, it does not reset per-list
> ->initialized flag.
>
> 3) Second ath11k_hal_dump_srng_stats() call sees stale ->initialized
> flag and attempts to dump srng stats:
>
> Last interrupt received for each group:
> ath11k_pci 0000:01:00.0: group_id 0 66785ms before
> ath11k_pci 0000:01:00.0: group_id 1 14485062ms before
> ath11k_pci 0000:01:00.0: group_id 2 14485062ms before
> ath11k_pci 0000:01:00.0: group_id 3 14485062ms before
> ath11k_pci 0000:01:00.0: group_id 4 14780845ms before
> ath11k_pci 0000:01:00.0: group_id 5 14780845ms before
> ath11k_pci 0000:01:00.0: group_id 6 14485062ms before
> ath11k_pci 0000:01:00.0: group_id 7 66814ms before
> ath11k_pci 0000:01:00.0: group_id 8 68997ms before
> ath11k_pci 0000:01:00.0: group_id 9 67588ms before
> ath11k_pci 0000:01:00.0: group_id 10 69511ms before
> BUG: unable to handle page fault for address: ffffa007404eb010
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 100000067 P4D 100000067 PUD 10022d067 PMD 100b01067 PTE 0
> Oops: 0000 [#1] PREEMPT SMP NOPTI
> RIP: 0010:ath11k_hal_dump_srng_stats+0x2b4/0x3b0 [ath11k]
> Call Trace:
> <TASK>
> ? __die_body+0xae/0xb0
> ? page_fault_oops+0x381/0x3e0
> ? exc_page_fault+0x69/0xa0
> ? asm_exc_page_fault+0x22/0x30
> ? ath11k_hal_dump_srng_stats+0x2b4/0x3b0 [ath11k (HASH:6cea 4)]
> ath11k_qmi_driver_event_work+0xbd/0x1050 [ath11k (HASH:6cea 4)]
> worker_thread+0x389/0x930
> kthread+0x149/0x170
>
> Clear per-list ->initialized flag in ath11k_hal_srng_deinit().
>
> Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
> ---
>
> v3:
> - updated commit message and subject line (Baochen Qiang)
>
> drivers/net/wireless/ath/ath11k/hal.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/wireless/ath/ath11k/hal.c b/drivers/net/wireless/ath/ath11k/hal.c
> index 8cb1505a5a0c..cab11a35f911 100644
> --- a/drivers/net/wireless/ath/ath11k/hal.c
> +++ b/drivers/net/wireless/ath/ath11k/hal.c
> @@ -1346,6 +1346,10 @@ EXPORT_SYMBOL(ath11k_hal_srng_init);
> void ath11k_hal_srng_deinit(struct ath11k_base *ab)
> {
> struct ath11k_hal *hal = &ab->hal;
> + int i;
> +
> + for (i = 0; i < HAL_SRNG_RING_ID_MAX; i++)
> + ab->hal.srng_list[i].initialized = 0;
>
> ath11k_hal_unregister_srng_key(ab);
> ath11k_hal_free_cont_rdp(ab);
Reviewed-by: Baochen Qiang <quic_bqiang@xxxxxxxxxxx>
