Quoting Michał Winiarski (2018-07-26 12:44:08) > On Thu, Jul 26, 2018 at 09:50:31AM +0100, Chris Wilson wrote: > > Prevent > > [ 397.873143] general protection fault: 0000 [#1] PREEMPT SMP PTI > > [ 397.873154] CPU: 4 PID: 4799 Comm: drv_module_relo Tainted: G U 4.18.0-rc6-CI-CI_DRM_4534+ #1 > > [ 397.873162] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.10 12/28/2017 > > [ 397.873175] RIP: 0010:__lock_acquire+0xf6/0x1b50 > > [ 397.873179] Code: 85 c0 4c 8b 9d 40 ff ff ff 8b 8d 38 ff ff ff 44 8b 8d 30 ff ff ff 4c 8b 85 28 ff ff ff 44 8b 95 24 ff ff ff 0f 84 54 03 00 00 <f0> ff 80 38 01 00 00 8b 15 45 8c 59 02 45 8b bc 24 70 08 00 00 85 > > [ 397.873240] RSP: 0018:ffffc90000497b40 EFLAGS: 00010002 > > [ 397.873246] RAX: 6b6b6b6b6b6b6b6b RBX: 0000000000000001 RCX: 0000000000000000 > > [ 397.873252] RDX: 0000000000000046 RSI: 0000000000000000 RDI: 0000000000000000 > > [ 397.873258] RBP: ffffc90000497c20 R08: ffffffff810a25e9 R09: 0000000000000000 > > [ 397.873264] R10: 0000000000000000 R11: ffff880255c63c28 R12: ffff8801093b2840 > > [ 397.873270] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000246 > > [ 397.873277] FS: 00007faf88d71980(0000) GS:ffff880266300000(0000) knlGS:0000000000000000 > > [ 397.873284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 397.873289] CR2: 000055d866c9ca10 CR3: 000000025472e006 CR4: 00000000003606e0 > > [ 397.873295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > [ 397.873301] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > [ 397.873308] Call Trace: > > [ 397.873318] ? lock_acquire+0xa6/0x210 > > [ 397.873323] lock_acquire+0xa6/0x210 > > [ 397.873331] ? drain_workqueue+0x19/0x180 > > [ 397.873339] __mutex_lock+0x89/0x980 > > [ 397.873346] ? drain_workqueue+0x19/0x180 > > [ 397.873352] ? _raw_spin_unlock_irqrestore+0x4c/0x60 > > [ 397.873359] ? trace_hardirqs_on_caller+0xe0/0x1b0 > > [ 397.873365] ? drain_workqueue+0x19/0x180 > > [ 397.873373] ? debug_object_active_state+0x127/0x150 > > [ 397.873381] ? drain_workqueue+0x19/0x180 > > [ 397.873387] drain_workqueue+0x19/0x180 > > [ 397.873395] destroy_workqueue+0x12/0x1f0 > > [ 397.873476] intel_guc_fini_misc+0x36/0x90 [i915] > > [ 397.873540] i915_gem_fini+0x91/0x100 [i915] > > [ 397.873588] i915_driver_unload+0xd2/0x110 [i915] > > [ 397.873638] i915_pci_remove+0x19/0x30 [i915] > > [ 397.873646] pci_device_remove+0x36/0xb0 > > [ 397.873653] device_release_driver_internal+0x185/0x250 > > [ 397.873660] driver_detach+0x35/0x70 > > [ 397.873668] bus_remove_driver+0x53/0xd0 > > [ 397.873675] pci_unregister_driver+0x25/0xa0 > > [ 397.873683] __se_sys_delete_module+0x162/0x210 > > [ 397.873691] ? do_syscall_64+0xd/0x190 > > [ 397.873697] do_syscall_64+0x55/0x190 > > [ 397.873704] entry_SYSCALL_64_after_hwframe+0x49/0xbe > > [ 397.873710] RIP: 0033:0x7faf884231b7 > > [ 397.873714] Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48 > > [ 397.873775] RSP: 002b:00007ffda4e98cf8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 > > [ 397.873784] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faf884231b7 > > [ 397.873790] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055fbb18f1bd8 > > [ 397.873796] RBP: 000055fbb18f1b70 R08: 000055fbb18f1bdc R09: 00007ffda4e98d38 > > [ 397.873802] R10: 00007ffda4e97cf4 R11: 0000000000000206 R12: 000055fbb0d32470 > > [ 397.873808] R13: 00007ffda4e992e0 R14: 0000000000000000 R15: 0000000000000000 > > > > v2: It's use-after-free; not a NULL pointer. > > > > Testcase: igt/drv_module_reload/basic-reload-inject > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx> > > Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx> > > Whole series: > > Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx> And with that, the band aids should be in place. Hopefully the code will heal miraculously as we take them off again... -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
