BUG: unable to handle page fault for address: fffff52000a8ca00 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 17ffed067 P4D 17ffed067 PUD 1c695067 PMD 26a46067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 9102 Comm: syz.1.939 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] RIP: 0010:fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:153 [inline] RIP: 0010:fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] RIP: 0010:sys_imageblit+0xaf6/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24 Code: 83 fb 3f 0f 8e 28 ff ff ff e8 26 82 ca fc 48 63 44 24 18 48 8b 54 24 10 4c 8d 34 c2 8d 48 01 4c 89 f2 89 4c 24 18 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 36 10 00 00 49 89 2e 83 e3 3f 31 ff 31 ed 89 RSP: 0018:ffffc9000cdaf3d8 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000001 RDX: 1ffff92000a8ca00 RSI: ffffffff84f276aa RDI: 0000000000000005 RBP: 0001000000010000 R08: 0000000000000005 R09: 000000000000003f R10: 0000000000000040 R11: 0000000000000001 R12: 0000000000010000 R13: 000000000000001f R14: ffffc90005465000 R15: dffffc0000000000 FS: 00007f981c5a56c0(0000) GS:ffff8880d6a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000a8ca00 CR3: 0000000052fc9000 CR4: 0000000000352ef0 Call Trace: drm_fbdev_shmem_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_shmem.c:38 soft_cursor+0x524/0xa10 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0xe8c/0x17e0 drivers/video/fbdev/core/bitblit.c:395 fbcon_cursor+0x40c/0x5a0 drivers/video/fbdev/core/fbcon.c:1355 fbcon_scroll+0x222/0x640 drivers/video/fbdev/core/fbcon.c:1776 con_scroll+0x45f/0x690 drivers/tty/vt/vt.c:588 lf+0x26e/0x2c0 drivers/tty/vt/vt.c:1453 vc_con_write_normal drivers/tty/vt/vt.c:3130 [inline] do_con_write+0xdb3/0x8290 drivers/tty/vt/vt.c:3232 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3565 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0x41e/0x11e0 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x503/0x9b0 drivers/tty/tty_io.c:1081 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f981b78f6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f981c5a5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f981b9e5fa0 RCX: 00007f981b78f6c9 RDX: 0000000000001006 RSI: 0000200000001080 RDI: 000000000000000c RBP: 00007f981b811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f981b9e6038 R14: 00007f981b9e5fa0 R15: 00007ffd8fba8448 Modules linked in: CR2: fffff52000a8ca00 ---[ end trace 0000000000000000 ]--- RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] RIP: 0010:fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:153 [inline] RIP: 0010:fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] RIP: 0010:sys_imageblit+0xaf6/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24 Code: 83 fb 3f 0f 8e 28 ff ff ff e8 26 82 ca fc 48 63 44 24 18 48 8b 54 24 10 4c 8d 34 c2 8d 48 01 4c 89 f2 89 4c 24 18 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 36 10 00 00 49 89 2e 83 e3 3f 31 ff 31 ed 89 RSP: 0018:ffffc9000cdaf3d8 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000001 RDX: 1ffff92000a8ca00 RSI: ffffffff84f276aa RDI: 0000000000000005 RBP: 0001000000010000 R08: 0000000000000005 R09: 000000000000003f R10: 0000000000000040 R11: 0000000000000001 R12: 0000000000010000 R13: 000000000000001f R14: ffffc90005465000 R15: dffffc0000000000 FS: 00007f981c5a56c0(0000) GS:ffff8880d6a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000a8ca00 CR3: 0000000052fc9000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 83 fb 3f cmp $0x3f,%ebx 3: 0f 8e 28 ff ff ff jle 0xffffff31 9: e8 26 82 ca fc call 0xfcca8234 e: 48 63 44 24 18 movslq 0x18(%rsp),%rax 13: 48 8b 54 24 10 mov 0x10(%rsp),%rdx 18: 4c 8d 34 c2 lea (%rdx,%rax,8),%r14 1c: 8d 48 01 lea 0x1(%rax),%ecx 1f: 4c 89 f2 mov %r14,%rdx 22: 89 4c 24 18 mov %ecx,0x18(%rsp) 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 42 80 3c 3a 00 cmpb $0x0,(%rdx,%r15,1) <-- trapping instruction 2f: 0f 85 36 10 00 00 jne 0x106b 35: 49 89 2e mov %rbp,(%r14) 38: 83 e3 3f and $0x3f,%ebx 3b: 31 ff xor %edi,%edi 3d: 31 ed xor %ebp,%ebp 3f: 89 .byte 0x89