On Mon, Apr 3, 2023 at 12:57 AM syzbot syzbot+54280c5aea19802490b5@syzkaller.appspotmail.com 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.... vmlinux: https://storage.googleapis.com/syzbot-assets/fabbf89c0d22/vmlinux-a6d9e303.x... kernel image: https://storage.googleapis.com/syzbot-assets/1ed05d6192fa/bzImage-a6d9e303.x...
The issue was bisected to:
commit d39e48ca80c0960b039cb38633957f0040f63e1a Author: Rob Clark robdclark@chromium.org 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/
BR, -R
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@syzkaller.appspotmail.com 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
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