Hello, syzbot found the following issue on: HEAD commit: 670c12ce09a8 Merge tag 'for-6.11/dm-fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d41cdd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b dashboard link: https://syzkaller.appspot.com/bug?extid=c4b7aa0513823e2ea880 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-670c12ce.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fdc54e331300/vmlinux-670c12ce.xz kernel image: https://storage.googleapis.com/syzbot-assets/e69f58032670/bzImage-670c12ce.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c4b7aa0513823e2ea880@xxxxxxxxxxxxxxxxxxxxxxxxx FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 CPU: 0 UID: 0 PID: 5106 Comm: syz.0.0 Not tainted 6.11.0-rc3-syzkaller-00221-g670c12ce09a8 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153 prepare_alloc_pages+0x1da/0x5d0 mm/page_alloc.c:4473 __alloc_pages_noprof+0x166/0x6c0 mm/page_alloc.c:4689 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4103 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4130 __do_kmalloc_node mm/slub.c:4146 [inline] __kmalloc_noprof+0x2ae/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] vc_do_resize+0x31b/0x17f0 drivers/tty/vt/vt.c:1174 vc_resize include/linux/vt_kern.h:49 [inline] fbcon_set_disp+0xac9/0x11d0 drivers/video/fbdev/core/fbcon.c:1389 con2fb_init_display drivers/video/fbdev/core/fbcon.c:794 [inline] set_con2fb_map+0xa6c/0x10a0 drivers/video/fbdev/core/fbcon.c:865 fbcon_set_con2fb_map_ioctl+0x207/0x320 drivers/video/fbdev/core/fbcon.c:3092 do_fb_ioctl+0x38f/0x7b0 drivers/video/fbdev/core/fb_chrdev.c:138 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f76311799b9 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:00007f7631f9d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7631315f80 RCX: 00007f76311799b9 RDX: 00000000200000c0 RSI: 0000000000004610 RDI: 0000000000000003 RBP: 00007f7631f9d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f7631315f80 R15: 00007ffcf9b0e3e8 </TASK> ================================================================== BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x1ec6/0x2b00 drivers/video/fbdev/core/sysimgblt.c:326 Write of size 4 at addr ffffc90001c19000 by task syz.0.0/5106 CPU: 0 UID: 0 PID: 5106 Comm: syz.0.0 Not tainted 6.11.0-rc3-syzkaller-00221-g670c12ce09a8 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline] sys_imageblit+0x1ec6/0x2b00 drivers/video/fbdev/core/sysimgblt.c:326 drm_fbdev_shmem_defio_imageblit+0x2e/0x100 drivers/gpu/drm/drm_fbdev_shmem.c:39 bit_putcs+0x18ba/0x1db0 fbcon_putcs+0x255/0x390 drivers/video/fbdev/core/fbcon.c:1288 do_update_region+0x396/0x450 drivers/tty/vt/vt.c:619 redraw_screen+0x902/0xe90 drivers/tty/vt/vt.c:971 con2fb_init_display drivers/video/fbdev/core/fbcon.c:794 [inline] set_con2fb_map+0xa6c/0x10a0 drivers/video/fbdev/core/fbcon.c:865 fbcon_set_con2fb_map_ioctl+0x207/0x320 drivers/video/fbdev/core/fbcon.c:3092 do_fb_ioctl+0x38f/0x7b0 drivers/video/fbdev/core/fb_chrdev.c:138 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f76311799b9 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:00007f7631f9d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7631315f80 RCX: 00007f76311799b9 RDX: 00000000200000c0 RSI: 0000000000004610 RDI: 0000000000000003 RBP: 00007f7631f9d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f7631315f80 R15: 00007ffcf9b0e3e8 </TASK> The buggy address belongs to the virtual mapping at [ffffc90001919000, ffffc90001c1a000) created by: drm_gem_shmem_vmap+0x3ac/0x630 drivers/gpu/drm/drm_gem_shmem_helper.c:343 Memory state around the buggy address: ffffc90001c18f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90001c18f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90001c19000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90001c19080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90001c19100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
