Hello,
I've just build and booted the Etnaviv driver as module with Kernel 4.0.4.
When I unload the driver with rmmod an oops happens:
------------[ cut here ]------------ WARNING: CPU: 1 PID: 2192 at drivers/staging/etnaviv/etnaviv_gem.c:404 etnaviv_gem_paddr_locked+0x30/0x38 [etnaviv]() Modules linked in: nft_reject_ipv6 nf_reject_ipv6 nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 nf_tables_ipv6 nft_reject_ipv4 nf_reject_ipv4 nft_reject nf_log_ipv4 nf_log_common nft_log nft_counter nft_meta nf_conntrack_ipv4 nf_defrag_ipv4 nft_ct nf_conntrack nft_hash nft_rbtree nf_tables_ipv4 nf_tables nfnetlink bridge stp llc rfcomm bnep hci_uart sch_sfq nfsd auth_rpcgss lockd grace sunrpc imx_ipuv3_crtc dw_hdmi_imx dw_hdmi evdev imx_ipu_v3 brcmfmac imxdrm brcmutil ci_hdrc_imx ci_hdrc imx_thermal etnaviv(C-) usbmisc_imx drm_kms_helper gpio_keys CPU: 1 PID: 2192 Comm: rmmod Tainted: G C 4.0.4-wandq-00210-g9240da9 #325 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [<8010cd14>] (unwind_backtrace) from [<80109778>] (show_stack+0x10/0x14) [<80109778>] (show_stack) from [<8068ed1c>] (dump_stack+0x94/0xd4) [<8068ed1c>] (dump_stack) from [<80126a54>] (warn_slowpath_common+0x84/0xb4) [<80126a54>] (warn_slowpath_common) from [<80126b20>] (warn_slowpath_null+0x1c/0x24) [<80126b20>] (warn_slowpath_null) from [<7f059d28>] (etnaviv_gem_paddr_locked+0x30/0x38 [etnaviv]) [<7f059d28>] (etnaviv_gem_paddr_locked [etnaviv]) from [<7f05b198>] (etnaviv_gpu_hw_init+0xb4/0x18c [etnaviv]) [<7f05b198>] (etnaviv_gpu_hw_init [etnaviv]) from [<7f05bbf0>] (etnaviv_gpu_rpm_resume+0x70/0xcc [etnaviv]) [<7f05bbf0>] (etnaviv_gpu_rpm_resume [etnaviv]) from [<80413044>] (__rpm_callback+0x2c/0x60) [<80413044>] (__rpm_callback) from [<80413098>] (rpm_callback+0x20/0x80) [<80413098>] (rpm_callback) from [<80413e50>] (rpm_resume+0x350/0x524) [<80413e50>] (rpm_resume) from [<80414070>] (__pm_runtime_resume+0x4c/0x64) [<80414070>] (__pm_runtime_resume) from [<8040b9a8>] (__device_release_driver+0x1c/0xc4) [<8040b9a8>] (__device_release_driver) from [<8040c0f4>] (driver_detach+0xac/0xb0) [<8040c0f4>] (driver_detach) from [<8040b75c>] (bus_remove_driver+0x4c/0xa0) [<8040b75c>] (bus_remove_driver) from [<7f05dcc8>] (etnaviv_exit+0x10/0x348 [etnaviv]) [<7f05dcc8>] (etnaviv_exit [etnaviv]) from [<801839d4>] (SyS_delete_module+0x174/0x1b8) [<801839d4>] (SyS_delete_module) from [<80106420>] (ret_fast_syscall+0x0/0x34) ---[ end trace e3e10844e84f28b3 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000058 pgd = d0430000 [00000058] *pgd=60452831, *pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM Modules linked in: nft_reject_ipv6 nf_reject_ipv6 nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 nf_tables_ipv6 nft_reject_ipv4 nf_reject_ipv4 nft_reject nf_log_ipv4 nf_log_common nft_log nft_counter nft_meta nf_conntrack_ipv4 nf_defrag_ipv4 nft_ct nf_conntrack nft_hash nft_rbtree nf_tables_ipv4 nf_tables nfnetlink bridge stp llc rfcomm bnep hci_uart sch_sfq nfsd auth_rpcgss lockd grace sunrpc imx_ipuv3_crtc dw_hdmi_imx dw_hdmi evdev imx_ipu_v3 brcmfmac imxdrm brcmutil ci_hdrc_imx ci_hdrc imx_thermal etnaviv(C-) usbmisc_imx drm_kms_helper gpio_keys CPU: 1 PID: 2192 Comm: rmmod Tainted: G WC 4.0.4-wandq-00210-g9240da9 #325 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) task: d48ce300 ti: d1f26000 task.ti: d1f26000 PC is at etnaviv_buffer_init+0x4/0xa0 [etnaviv] LR is at etnaviv_gpu_hw_init+0x98/0x18c [etnaviv] pc : [<7f05d4f0>] lr : [<7f05b17c>] psr: a00e0013\x0asp : d1f27e98 ip : 00000000 fp : 01c09d58 r10: 00000000 r9 : d1f26000 r8 : 00000004 r7 : 80a02100 r6 : 80411c80 r5 : dd75bfc0 r4 : dd61f410 r3 : 00000000 r2 : 00000730 r1 : 00000000 r0 : dd61f410 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 10c5387d Table: 6043004a DAC: 00000015 Process rmmod (pid: 2192, stack limit = 0xd1f26210) Stack: (0xd1f27e98 to 0xd1f28000) 7e80: 00000001 dd61f410 7ea0: dd75bfc0 7f05bbf0 7f05bb80 de120a10 de120a74 80413044 de120a10 00000000 7ec0: de120410 80413098 80411c80 de120a10 00000000 80413e50 01c09d58 8068bebc 7ee0: ddaf2e25 8068c028 de1bb3a4 7f0601a4 de1d4044 de120a10 de120a74 00000004 7f00: 600e0013 801065a4 d1f26000 80414070 7f0601a4 de120a10 7f0601a4 de120a44 7f20: 00000081 8040b9a8 7f0601a4 de120a10 7f0601a4 8040c0f4 7f0601a4 01c09d8c 7f40: 00000000 8040b75c 7f060240 7f05dcc8 7f05dcb8 801839d4 d4b29488 616e7465 7f60: 00766976 00000000 d48ce728 00000000 d48ce728 00000000 80a4230c d48ce300 7f80: 01c09d58 8013da84 d4b29480 d1f26000 801065a4 00f27fb0 00000006 01c09d58 7fa0: 7e868e68 80106420 01c09d58 7e868e68 01c09d8c 00000800 63760a00 63760a00 7fc0: 01c09d58 7e868e68 00000000 00000081 00000001 7e869078 0002e1a0 01c09d58 7fe0: 76e94400 7e868e14 000186d0 76e9440c 600e0010 01c09d8c 3136315b 203a5d39 [<7f05d4f0>] (etnaviv_buffer_init [etnaviv]) from [<00000001>] (0x1) Code: eb4c93a7 e28dd014 e8bd8030 e5903050 (e5932058) ---[ end trace e3e10844e84f28b4 ]---
I've tried it two times, both ended with the same oops. So it seems to be reproducible (here).
I haven't had a deeper look at the source, but after a quick look I assume a fix isn't that hard.
Regards,
Alexander Holler