[drm] Initialized gud 1.0.0 for 10-1:1.0 on minor 1 ================================================================== BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:38 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_prepare_logo+0x4ba/0xe40 drivers/video/fbdev/core/fbcon.c:685 Read of size 256 at addr ffff888079e9c760 by task kworker/1:1/30 CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 scr_memcpyw include/linux/vt_buffer.h:38 [inline] fbcon_prepare_logo+0x4ba/0xe40 drivers/video/fbdev/core/fbcon.c:685 fbcon_init+0x10fd/0x1b30 drivers/video/fbdev/core/fbcon.c:1227 visual_init+0x2e3/0x660 drivers/tty/vt/vt.c:1048 do_bind_con_driver+0x86f/0x1040 drivers/tty/vt/vt.c:4054 do_take_over_console+0x888/0xa10 drivers/tty/vt/vt.c:4594 do_fbcon_takeover+0x119/0x200 drivers/video/fbdev/core/fbcon.c:620 do_fb_registered drivers/video/fbdev/core/fbcon.c:3007 [inline] fbcon_fb_registered+0x361/0x610 drivers/video/fbdev/core/fbcon.c:3031 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:538 [inline] register_framebuffer+0x6e8/0x880 drivers/video/fbdev/core/fbmem.c:605 __drm_fb_helper_initial_config_and_unlock+0x1555/0x1b50 drivers/gpu/drm/drm_fb_helper.c:1746 drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66 drm_client_register+0x16e/0x200 drivers/gpu/drm/drm_client.c:143 drm_fbdev_client_setup+0x1a0/0x450 drivers/gpu/drm/clients/drm_fbdev_client.c:168 drm_client_setup+0x107/0x220 drivers/gpu/drm/clients/drm_client_setup.c:46 gud_probe+0x11b9/0x13b0 drivers/gpu/drm/gud/gud_drv.c:655 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2708 hub_port_connect drivers/usb/core/hub.c:5580 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5966 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 19479: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010 __kernfs_new_node+0xe6/0x980 fs/kernfs/dir.c:665 kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050 sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316 create_files fs/sysfs/group.c:82 [inline] internal_create_group+0x679/0x1180 fs/sysfs/group.c:189 internal_create_groups fs/sysfs/group.c:229 [inline] sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255 rx_queue_add_kobject net/core/net-sysfs.c:1245 [inline] net_rx_queue_update_kobjects+0x2a4/0x780 net/core/net-sysfs.c:1301 register_queue_kobjects net/core/net-sysfs.c:2093 [inline] netdev_register_kobject+0x23e/0x350 net/core/net-sysfs.c:2344 register_netdevice+0x1433/0x1eb0 net/core/dev.c:11503 register_vlan_dev+0x3a0/0x850 net/8021q/vlan.c:179 vlan_newlink+0x4b2/0x610 net/8021q/vlan_netlink.c:194 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:3969 __rtnl_newlink net/core/rtnetlink.c:4098 [inline] rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4215 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x408/0x5a0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2284 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888079e9c690 which belongs to the cache kernfs_node_cache of size 176 The buggy address is located 32 bytes to the right of allocated 176-byte region [ffff888079e9c690, ffff888079e9c740) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79e9c flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888140413140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000200110011 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6236, tgid 6236 (syz-executor), ts 177155958175 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7410 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] kmem_cache_alloc_noprof+0x399/0x600 mm/slub.c:5010 __kernfs_new_node+0xe6/0x980 fs/kernfs/dir.c:665 kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050 sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316 create_files fs/sysfs/group.c:82 [inline] internal_create_group+0x679/0x1180 fs/sysfs/group.c:189 internal_create_groups fs/sysfs/group.c:229 [inline] sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255 device_add_groups drivers/base/core.c:2911 [inline] device_add_attrs+0x1b1/0x600 drivers/base/core.c:2986 device_add+0x488/0xb80 drivers/base/core.c:3715 netdev_register_kobject+0x197/0x350 net/core/net-sysfs.c:2340 page last free pid 5624 tgid 5624 ts 177128183173 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_unref_folios+0xdc2/0x14e0 mm/page_alloc.c:3022 folios_put_refs+0x9e9/0xb30 mm/folio.c:1034 folio_batch_release include/linux/folio_batch.h:101 [inline] truncate_inode_pages_range+0x3ca/0xd80 mm/truncate.c:408 kill_bdev block/bdev.c:90 [inline] blkdev_flush_mapping+0x109/0x2f0 block/bdev.c:757 blkdev_put_whole block/bdev.c:764 [inline] bdev_release+0x443/0x690 block/bdev.c:1189 blkdev_release+0x15/0x20 block/fops.c:682 __fput+0x418/0xa50 fs/file_table.c:512 fput_close_sync+0x11f/0x240 fs/file_table.c:617 __do_sys_close fs/open.c:1560 [inline] __se_sys_close fs/open.c:1545 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1545 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888079e9c600: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff888079e9c680: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888079e9c700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888079e9c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888079e9c800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 ==================================================================