drivers/iommu/qcom_iommu.c:348 qcom_iommu_domain_free+0x5c/0x70

[Naresh Kamboju]

We have noticed these kernel warnings on APQ 8016 SBC  (dragonboard
410c ) running stable rc 5.5, 5.4 branches and linux mainline and
linux-next master branches.

This warning started happening from linux mainline 5.3 onwards (2019-08-29)

[    5.488128] ------------[ cut here ]------------
[    5.488161] WARNING: CPU: 3 PID: 221 at
drivers/iommu/qcom_iommu.c:348 qcom_iommu_domain_free+0x5c/0x70
[    5.491817] Modules linked in: crct10dif_ce(+) adv7511(+) cec
msm(+) mdt_loader drm_kms_helper drm fuse
[    5.491842] CPU: 3 PID: 221 Comm: systemd-udevd Not tainted
5.4.21-rc1-00037-g6f8f5c79416e #1
[    5.491844] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[    5.491849] pstate: 00000005 (nzcv daif -PAN -UAO)
[    5.491858] pc : qcom_iommu_domain_free+0x5c/0x70
[    5.491865] lr : iommu_group_release+0x44/0x60
[    5.491867] sp : ffff800011e83600
         Starting Network Manager...[    5.491870] x29:
ffff800011e83600 x28: 0000000000000100
[    5.491893] x19: ffff000036a9e500 x18: 0000000000000001
[    5.491898] x17: 0000000000000000 x16: 0000000000000000
[    5.491902] x15: 0000000000000004 x14: 0000000000000000
[    5.491907] x13: 0000000000000000 x12: ffff00003a137aa0
[    5.491911] x11: ffff00003a137908 x10: 0000000000000000
[    5.491916] x9 : ffff00000eb2c098 x8 : ffff00000eb2c090
[    5.491920] x7 : 00000000400c0000 x6 : 0000000000000004
[    5.491924] x5 : 0000000000000001 x4 : 0000000000000000
[    5.491929] x3 : 0000000000000000 x2 : 0000000000000000
[    5.491933] x1 : ffff00003bdb9680 x0 : ffff000036aa0ab0
[    5.491938] Call trace:
[    5.491946]  qcom_iommu_domain_free+0x5c/0x70
[    5.491951]  iommu_group_release+0x44/0x60
[    5.491957]  kobject_put+0x6c/0xf0
[    5.491962]  kobject_del+0x50/0x68
[    5.491966]  kobject_put+0xd0/0xf0
[    5.491972]  iommu_group_remove_device+0xd8/0xec
[    5.491977]  qcom_iommu_remove_device+0x44/0x60
[    5.491982]  iommu_release_device+0x28/0x40
[    5.491987]  iommu_bus_notifier+0xac/0xc0
[    5.491993]  notifier_call_chain+0x58/0x98
[    5.491998]  blocking_notifier_call_chain+0x54/0x78
[    5.492003]  device_del+0x224/0x348
[    5.492008]  platform_device_del.part.0+0x18/0x88
[    5.492012]  platform_device_unregister+0x20/0x38
[    5.492019]  of_platform_device_destroy+0xdc/0xf0
[    5.492023]  device_for_each_child+0x58/0xa0
[    5.492028]  of_platform_depopulate+0x38/0x78
[    5.492155]  msm_pdev_probe+0x1c0/0x308 [msm]
[    5.492166]  platform_drv_probe+0x50/0xa0
[    5.682404]  really_probe+0xd4/0x308
[    5.686388]  driver_probe_device+0x54/0xe8
[    5.690035]  device_driver_attach+0x6c/0x78
[    5.693940]  __driver_attach+0x54/0xd0
[    5.698020]  bus_for_each_dev+0x6c/0xc0
[    5.701838]  driver_attach+0x20/0x28
[    5.705572]  bus_add_driver+0x140/0x1e8
[    5.709390]  driver_register+0x60/0x110
[    5.712950]  __platform_driver_register+0x44/0x50
[    5.716886]  msm_drm_register+0x54/0x68 [msm]
[    5.721633]  do_one_initcall+0x50/0x190
[    5.725972]  do_init_module+0x50/0x208
[    5.729615]  load_module+0x1d1c/0x2298
[    5.733435]  __do_sys_finit_module+0xd0/0xe8
[    5.737169]  __arm64_sys_finit_module+0x1c/0x28
[    5.741598]  el0_svc_common.constprop.0+0x68/0x160
[    5.745851]  el0_svc_handler+0x20/0x80
[    5.750709]  el0_svc+0x8/0xc
[    5.754443] ---[ end trace 0ebe200932dd18fc ]---


Full test log link,
https://lkft.validation.linaro.org/scheduler/job/1226062#L3841
https://lkft.validation.linaro.org/scheduler/job/1227242#L3877

Ref:
https://bugs.linaro.org/show_bug.cgi?id=5460

-- 
Linaro LKFT
https://lkft.linaro.org