BUG: unable to handle page fault for address: fffff52000799368 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffed067 P4D 23ffed067 PUD 1baea067 PMD 1df73067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 7005 Comm: syz.0.228 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] RIP: 0010:fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:364 [inline] RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline] RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] RIP: 0010:sys_imageblit+0x17bc/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24 Code: 7c cd 00 48 89 fe 48 c1 ee 03 80 3c 1e 00 0f 85 dc 02 00 00 4d 63 f6 48 8b 8c cc 28 01 00 00 4f 8d 34 f7 4c 89 f6 48 c1 ee 03 <80> 3c 1e 00 0f 85 94 02 00 00 49 89 0e 41 89 c6 8d 4d fd 41 c1 ee RSP: 0018:ffffc900035d7690 EFLAGS: 00010a02 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff92000799368 RDI: ffffc900035d77b8 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000004 R11: ffff888031e14830 R12: ffff888025bd5191 R13: ffffc900035d77b8 R14: ffffc90003cc9b40 R15: ffffc90003cc9b40 FS: 00007f6c7a1106c0(0000) GS:ffff8881249fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000799368 CR3: 0000000076556000 CR4: 00000000003526f0 Call Trace: drm_fbdev_shmem_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_shmem.c:39 soft_cursor+0x524/0xa10 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0xe8c/0x17e0 drivers/video/fbdev/core/bitblit.c:395 fbcon_cursor+0x437/0x5d0 drivers/video/fbdev/core/fbcon.c:1378 set_cursor drivers/tty/vt/vt.c:868 [inline] set_cursor+0x1db/0x250 drivers/tty/vt/vt.c:859 con_flush_chars drivers/tty/vt/vt.c:3635 [inline] con_write+0x89/0xb0 drivers/tty/vt/vt.c:3566 process_output_block drivers/tty/n_tty.c:557 [inline] n_tty_write+0x434/0x1280 drivers/tty/n_tty.c:2366 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x503/0x9b0 drivers/tty/tty_io.c:1081 tty_write drivers/tty/tty_io.c:1102 [inline] redirected_tty_write drivers/tty/tty_io.c:1125 [inline] redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105 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/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c7918f7c9 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:00007f6c7a110038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6c793e5fa0 RCX: 00007f6c7918f7c9 RDX: 000000000000fdef RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f6c79213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6c793e6038 R14: 00007f6c793e5fa0 R15: 00007ffe51cbe6b8 Modules linked in: CR2: fffff52000799368 ---[ end trace 0000000000000000 ]--- RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] RIP: 0010:fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:364 [inline] RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline] RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] RIP: 0010:sys_imageblit+0x17bc/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24 Code: 7c cd 00 48 89 fe 48 c1 ee 03 80 3c 1e 00 0f 85 dc 02 00 00 4d 63 f6 48 8b 8c cc 28 01 00 00 4f 8d 34 f7 4c 89 f6 48 c1 ee 03 <80> 3c 1e 00 0f 85 94 02 00 00 49 89 0e 41 89 c6 8d 4d fd 41 c1 ee RSP: 0018:ffffc900035d7690 EFLAGS: 00010a02 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff92000799368 RDI: ffffc900035d77b8 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000004 R11: ffff888031e14830 R12: ffff888025bd5191 R13: ffffc900035d77b8 R14: ffffc90003cc9b40 R15: ffffc90003cc9b40 FS: 00007f6c7a1106c0(0000) GS:ffff8881249fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000799368 CR3: 0000000076556000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 7c cd jl 0xffffffcf 2: 00 48 89 add %cl,-0x77(%rax) 5: fe 48 c1 decb -0x3f(%rax) 8: ee out %al,(%dx) 9: 03 80 3c 1e 00 0f add 0xf001e3c(%rax),%eax f: 85 dc test %ebx,%esp 11: 02 00 add (%rax),%al 13: 00 4d 63 add %cl,0x63(%rbp) 16: f6 48 8b 8c testb $0x8c,-0x75(%rax) 1a: cc int3 1b: 28 01 sub %al,(%rcx) 1d: 00 00 add %al,(%rax) 1f: 4f 8d 34 f7 lea (%r15,%r14,8),%r14 23: 4c 89 f6 mov %r14,%rsi 26: 48 c1 ee 03 shr $0x3,%rsi * 2a: 80 3c 1e 00 cmpb $0x0,(%rsi,%rbx,1) <-- trapping instruction 2e: 0f 85 94 02 00 00 jne 0x2c8 34: 49 89 0e mov %rcx,(%r14) 37: 41 89 c6 mov %eax,%r14d 3a: 8d 4d fd lea -0x3(%rbp),%ecx 3d: 41 rex.B 3e: c1 .byte 0xc1 3f: ee out %al,(%dx)