On Mon, 3 Apr 2023 at 18:26, Rob Clark <robdclark@xxxxxxxxxxxx> wrote: > > On Mon, Apr 3, 2023 at 12:57 AM syzbot > <syzbot+54280c5aea19802490b5@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: a6d9e3034536 Add linux-next specific files for 20230330 > > git tree: linux-next > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1001d1cdc80000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=aceb117f7924508e > > dashboard link: https://syzkaller.appspot.com/bug?extid=54280c5aea19802490b5 > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13435a2ec80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139c9c21c80000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/ec1f900ea929/disk-a6d9e303.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/fabbf89c0d22/vmlinux-a6d9e303.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/1ed05d6192fa/bzImage-a6d9e303.xz > > > > The issue was bisected to: > > > > commit d39e48ca80c0960b039cb38633957f0040f63e1a > > Author: Rob Clark <robdclark@xxxxxxxxxxxx> > > Date: Fri Sep 3 18:47:54 2021 +0000 > > > > drm/atomic-helper: Set fence deadline for vblank > > > > should be fixed by https://patchwork.freedesktop.org/series/115992/ Let's tell syzbot about the fix so that it reports similar crashes in future: #syz fix: drm/vblank: Fix for drivers that do not drm_vblank_init() > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d260c9c80000 > > final oops: https://syzkaller.appspot.com/x/report.txt?x=11d260c9c80000 > > console output: https://syzkaller.appspot.com/x/log.txt?x=16d260c9c80000 > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+54280c5aea19802490b5@xxxxxxxxxxxxxxxxxxxxxxxxx > > Fixes: d39e48ca80c0 ("drm/atomic-helper: Set fence deadline for vblank") > > > > [drm] Initialized udl 0.0.1 20120220 for 1-1:0.0 on minor 2 > > [drm] Initialized udl on minor 2 > > udl 1-1:0.0: [drm] *ERROR* Read EDID byte 0 failed err ffffffb9 > > udl 1-1:0.0: [drm] Cannot find any crtc or sizes > > general protection fault, probably for non-canonical address 0xdffffc0000000028: 0000 [#1] PREEMPT SMP KASAN > > KASAN: null-ptr-deref in range [0x0000000000000140-0x0000000000000147] > > CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.3.0-rc4-next-20230330-syzkaller #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 > > Workqueue: usb_hub_wq hub_event > > RIP: 0010:drm_crtc_next_vblank_start+0xb3/0x2b0 drivers/gpu/drm/drm_vblank.c:1003 > > Code: e8 01 00 00 48 69 db 38 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 03 9d 38 03 00 00 4c 8d ab 44 01 00 00 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 67 > > RSP: 0018:ffffc900000e6bb0 EFLAGS: 00010207 > > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 > > RDX: 0000000000000028 RSI: ffffffff849f2afb RDI: ffff888079558338 > > RBP: ffffc900000e6c48 R08: 0000000000000005 R09: 0000000000000000 > > R10: 0000000000000001 R11: 0000000000000010 R12: ffff8880795590d8 > > R13: 0000000000000144 R14: ffff8880795590d8 R15: dffffc0000000000 > > FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f17191c7688 CR3: 00000000281af000 CR4: 00000000003506f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > <TASK> > > set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1531 [inline] > > drm_atomic_helper_wait_for_fences+0x1b4/0x780 drivers/gpu/drm/drm_atomic_helper.c:1578 > > drm_atomic_helper_commit drivers/gpu/drm/drm_atomic_helper.c:2007 [inline] > > drm_atomic_helper_commit+0x1bd/0x370 drivers/gpu/drm/drm_atomic_helper.c:1979 > > drm_atomic_commit+0x20a/0x300 drivers/gpu/drm/drm_atomic.c:1503 > > drm_client_modeset_commit_atomic+0x69b/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1045 > > drm_client_modeset_commit_locked+0x149/0x580 drivers/gpu/drm/drm_client_modeset.c:1148 > > drm_client_modeset_commit+0x51/0x80 drivers/gpu/drm/drm_client_modeset.c:1174 > > drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1983 [inline] > > __drm_fb_helper_initial_config_and_unlock+0x118a/0x1510 drivers/gpu/drm/drm_fb_helper.c:2169 > > drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:2259 [inline] > > drm_fb_helper_initial_config+0x42/0x60 drivers/gpu/drm/drm_fb_helper.c:2251 > > drm_fbdev_generic_client_hotplug+0x1ab/0x270 drivers/gpu/drm/drm_fbdev_generic.c:281 > > drm_fbdev_generic_setup+0x127/0x3b0 drivers/gpu/drm/drm_fbdev_generic.c:343 > > udl_usb_probe+0x120/0x190 drivers/gpu/drm/udl/udl_drv.c:120 > > usb_probe_interface+0x30f/0x960 drivers/usb/core/driver.c:396 > > call_driver_probe drivers/base/dd.c:579 [inline] > > really_probe+0x240/0xca0 drivers/base/dd.c:658 > > __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:795 > > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:825 > > __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:953 > > bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457 > > __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1025 > > bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 > > device_add+0x11c4/0x1c50 drivers/base/core.c:3616 > > usb_set_configuration+0x10ee/0x1af0 drivers/usb/core/message.c:2171 > > usb_generic_driver_probe+0xcf/0x130 drivers/usb/core/generic.c:238 > > usb_probe_device+0xd8/0x2c0 drivers/usb/core/driver.c:293 > > call_driver_probe drivers/base/dd.c:579 [inline] > > really_probe+0x240/0xca0 drivers/base/dd.c:658 > > __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:795 > > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:825 > > __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:953 > > bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457 > > __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1025 > > bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 > > device_add+0x11c4/0x1c50 drivers/base/core.c:3616 > > usb_new_device+0xcb2/0x19d0 drivers/usb/core/hub.c:2575 > > hub_port_connect drivers/usb/core/hub.c:5407 [inline] > > hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] > > port_event drivers/usb/core/hub.c:5711 [inline] > > hub_event+0x2d9e/0x4e40 drivers/usb/core/hub.c:5793 > > process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 > > worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 > > kthread+0x33e/0x440 kernel/kthread.c:379 > > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > </TASK> > > Modules linked in: > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:drm_crtc_next_vblank_start+0xb3/0x2b0 drivers/gpu/drm/drm_vblank.c:1003 > > Code: e8 01 00 00 48 69 db 38 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 03 9d 38 03 00 00 4c 8d ab 44 01 00 00 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 67 > > RSP: 0018:ffffc900000e6bb0 EFLAGS: 00010207 > > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 > > RDX: 0000000000000028 RSI: ffffffff849f2afb RDI: ffff888079558338 > > RBP: ffffc900000e6c48 R08: 0000000000000005 R09: 0000000000000000 > > R10: 0000000000000001 R11: 0000000000000010 R12: ffff8880795590d8 > > R13: 0000000000000144 R14: ffff8880795590d8 R15: dffffc0000000000 > > FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f17191c7688 CR3: 000000002b398000 CR4: 00000000003506f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > ---------------- > > Code disassembly (best guess): > > 0: e8 01 00 00 48 callq 0x48000006 > > 5: 69 db 38 02 00 00 imul $0x238,%ebx,%ebx > > b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > > 12: fc ff df > > 15: 49 03 9d 38 03 00 00 add 0x338(%r13),%rbx > > 1c: 4c 8d ab 44 01 00 00 lea 0x144(%rbx),%r13 > > 23: 4c 89 ea mov %r13,%rdx > > 26: 48 c1 ea 03 shr $0x3,%rdx > > * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction > > 2e: 4c 89 e8 mov %r13,%rax > > 31: 83 e0 07 and $0x7,%eax > > 34: 83 c0 03 add $0x3,%eax > > 37: 38 d0 cmp %dl,%al > > 39: 7c 08 jl 0x43 > > 3b: 84 d2 test %dl,%dl > > 3d: 0f .byte 0xf > > 3e: 85 .byte 0x85 > > 3f: 67 addr32 > > > > > > --- > > This report is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > > syzbot can test patches for this issue, for details see: > > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/CAJs_Fx6jroBMGNtraHUZ9oBi8ubOS6RmxkF8hKCOQL3Z5vNTDw%40mail.gmail.com.
