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iq-x7181 crash in FastRPC / APR #781

Description

https://lava.infra.foundries.io/scheduler/job/298980

[   24.803769] qcom,apr 6800000.remoteproc:glink-edge.adsp_apps.-1.-1: failed to create endpoint
[   24.812568] qcom,apr 6800000.remoteproc:glink-edge.adsp_apps.-1.-1: probe with driver qcom,apr failed with error -12
[   24.823944] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000360
[...]
[   25.182305] Hardware name: Qualcomm Technologies, Inc. Hamoa IoT EVK (DT)
[   25.182306] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[   25.182308] pc : fastrpc_internal_invoke+0xa90/0x1304 [fastrpc]
[   25.200544] lr : fastrpc_internal_invoke+0xbd8/0x1304 [fastrpc]
[   25.200547] sp : ffff80009827bc90
[   25.200548] x29: ffff80009827bcf0 x28: ffff000804d63900 x27: ffff800097f95010
[   25.218427] x26: ffff800097f95000 x25: 0000000000000001 x24: 0000000000000004
[   25.218430] x23: 0000000000000000 x22: 0000000000000000 x21: ffff000843ce4000
[   25.218432] x20: ffff000804d63944 x19: ffff000804d63998 x18: 0000000000000000
[   25.261379] x17: 0000000000000000 x16: ffffd8dfb6d6dfcc x15: ffff80009827b9c0
[   25.261382] x14: ffff800080000000 x13: 0000000000000000 x12: ffff800097f95018
[   25.454365] x11: 0000000000000000 x10: ffff000800102018 x9 : 0000000000000000
[   25.454367] x8 : 0000000000000002 x7 : 0000000000000000 x6 : 0000000000000002
[   25.454369] x5 : ffff800097f95204 x4 : ffff80009827bd60 x3 : 0000000000000004
[   25.454371] x2 : 0000000000000028 x1 : ffff000804d63998 x0 : 0000000000000000
[   25.454374] Call trace:
[   25.454377]  fastrpc_internal_invoke+0xa90/0x1304 [fastrpc] (P)
[   25.454379]  fastrpc_device_release+0x6c/0x150 [fastrpc]
[   25.454381]  __fput+0xd4/0x2e0
[   25.454387]  fput_close_sync+0x38/0x114
[   25.454389]  __arm64_sys_close+0x38/0x88
[   25.454391]  invoke_syscall.constprop.0+0x40/0xe0
[   25.454396]  el0_svc_common.constprop.0+0x38/0xe0
[   25.454399]  do_el0_svc+0x1c/0x28
[   25.454401]  el0_svc+0x38/0x118
[   25.454406]  el0t_64_sync_handler+0xa0/0xe4
[   25.454408]  el0t_64_sync+0x19c/0x1a0
[   25.454411] Code: 37f832a0 f9404aa0 aa1303e1 52800502 (f941b000) 
[   25.454413] ---[ end trace 0000000000000000 ]---

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