BUG: unable to handle page fault for address: fffff520046f1200 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffed067 P4D 23ffed067 PUD 1ca83067 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 1410 Comm: syz.1.5228 Tainted: G U syzkaller #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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:ffffc9000eaf74f0 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff920046f1200 RDI: ffffc9000eaf7618 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000008 R11: 0000000000000000 R12: ffff888025fe1091 R13: ffffc9000eaf7618 R14: ffffc90023789000 R15: ffffc90023789000 FS: 00007f250fbf76c0(0000) GS:ffff8881247c3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff520046f1200 CR3: 000000008a0b2000 CR4: 00000000003526f0 Call Trace: drm_fbdev_shmem_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_shmem.c:38 ccw_putcs_aligned drivers/video/fbdev/core/fbcon_ccw.c:125 [inline] ccw_putcs+0x930/0xbc0 drivers/video/fbdev/core/fbcon_ccw.c:175 fbcon_putcs+0x384/0x4a0 drivers/video/fbdev/core/fbcon.c:1327 do_update_region+0x2e6/0x3f0 drivers/tty/vt/vt.c:627 do_con_trol drivers/tty/vt/vt.c:2712 [inline] do_con_write+0x1e27/0x8280 drivers/tty/vt/vt.c:3174 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3516 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0x41f/0x11e0 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x504/0x9b0 drivers/tty/tty_io.c:1081 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d0/0x11d0 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/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f250ed8ebe9 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:00007f250fbf7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f250efb6090 RCX: 00007f250ed8ebe9 RDX: 0000000000000060 RSI: 00002000000001c0 RDI: 0000000000000009 RBP: 00007f250ee11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f250efb6128 R14: 00007f250efb6090 R15: 00007ffd2888b838 Modules linked in: CR2: fffff520046f1200 ---[ 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:ffffc9000eaf74f0 EFLAGS: 00010a06 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff920046f1200 RDI: ffffc9000eaf7618 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000008 R11: 0000000000000000 R12: ffff888025fe1091 R13: ffffc9000eaf7618 R14: ffffc90023789000 R15: ffffc90023789000 FS: 00007f250fbf76c0(0000) GS:ffff8881247c3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff520046f1200 CR3: 000000008a0b2000 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)