Hi, I have the following error whenever I remove the fglrx module from the latest 6.0-rc4. Logs: /mnt/raid0/krops/workspace/sources/fglrx-module/module/firegl_public.c:1674 KCL_SetPageCache_Array <6>[fglrx] IRQ 37 Disabled BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 254 Comm: rmmod Tainted: G W O 6.0.0-rc4-qtec-standard #2 Hardware name: QTechnology QT5022/QT5022, BIOS PM_2.1.0.309 X64 09/27/2013 RIP: 0010:mutex_lock+0x2a/0x40 Code: 0f 1f 44 00 00 53 be 1b 01 00 00 48 89 fb 48 c7 c7 08 81 3d 82 e8 46 2c 52 ff e8 01 d7 ff ff 31 c0 65 48 8b 14 25 00 ad 01 00 <f0> 48 0f b1 13 74 06 48 89 df 5b eb b9 5b c3 0f 1f 80 00 00 00 00 RSP: 0018:ffffc90000b07dd8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: ffff888116aabb00 RSI: 000000000000011b RDI: ffffffff823d8108 RBP: ffff8881148d20d0 R08: 0000000000000000 R09: ffffffffa053537b R10: ffff888149365cc0 R11: ffffea00052c5048 R12: 0000000000000000 R13: ffff88813877c000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f6f90b3cb80(0000) GS:ffff88815b300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000011e4c8000 CR4: 00000000000006e0 Call Trace: <TASK> pci_disable_msi+0x34/0xe0 irqmgr_wrap_shutdown+0x165/0x190 [fglrx] ? firegl_takedown+0x841/0x950 [fglrx] ? kobject_put+0xa6/0x220 ? cleanup_device+0x299/0x2a0 [fglrx] ? pci_unregister_driver+0x42/0xa0 ? firegl_cleanup_device_heads+0x65/0xa0 [fglrx] ? firegl_cleanup_module+0x84/0x11c [fglrx] ? __x64_sys_delete_module+0x11b/0x210 ? get_vtime_delta+0xe/0x40 ? vtime_user_exit+0x1c/0x60 ? __ct_user_exit+0x68/0xb0 ? do_syscall_64+0x3c/0x80 ? entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Modules linked in: amdgpu fglrx(O-) ath9k ath9k_common mfd_core gpu_sched drm_buddy drm_ttm_helper ath9k_hw ttm drm_display_helper drm_kms_helper ath sp5100_tco syscopyarea sysfillrect sysimgblt fb_sys_fops video drm backlight ipv6 CR2: 0000000000000010 ---[ end trace 0000000000000000 ]--- RIP: 0010:mutex_lock+0x2a/0x40 Code: 0f 1f 44 00 00 53 be 1b 01 00 00 48 89 fb 48 c7 c7 08 81 3d 82 e8 46 2c 52 ff e8 01 d7 ff ff 31 c0 65 48 8b 14 25 00 ad 01 00 <f0> 48 0f b1 13 74 06 48 89 df 5b eb b9 5b c3 0f 1f 80 00 00 00 00 RSP: 0018:ffffc90000b07dd8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: ffff888116aabb00 RSI: 000000000000011b RDI: ffffffff823d8108 RBP: ffff8881148d20d0 R08: 0000000000000000 R09: ffffffffa053537b R10: ffff888149365cc0 R11: ffffea00052c5048 R12: 0000000000000000 R13: ffff88813877c000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f6f90b3cb80(0000) GS:ffff88815b300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000011e4c8000 CR4: 00000000000006e0 Steps: insmod fglrx.ko clinfo MatrixMultiplication rmmod fglrx.ko I know this is an out of tree driver from AMD but we still need that driver for some products because of the OpenCL stack support on it. Note: The open-source upstream radeon does not support OpenCL. So, doing git-bisect I found the issue is provoked by this commit [1]. Unfortunately, I cannot revert it for testing as if I do it the system hangs on boot because of this other commit [2]. I understand, the driver might have some issues but shouldn't the kernel prevent this crash at pci_disable_msi function? Do we have a mutex problem here provoked by the fglrx driver? Does anyone have any suggestions on how we can/should proceed with this? Thanks in advance, Daniel [1] Commit 93296cd1325d1d9afede60202d8833011c9001f2: 93296cd1325d 2021-12-15 PCI/MSI: Allocate MSI device data on first use [2] Commit ffd84485e6beb9cad3e5a133d88201b995298c33: ffd84485e6be 2021-12-10 PCI/MSI: Let the irq code handle sysfs groups
