Hello, syzbot found the following issue on: HEAD commit: 691781f561e9 Add linux-next specific files for 20230123 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=148d1815480000 kernel config: https://syzkaller.appspot.com/x/.config?x=804cddf7ddbc6c64 dashboard link: https://syzkaller.appspot.com/bug?extid=ac877d1de3aa7263e7f4 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b92cb9480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=169917fe480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/95b9320565c9/disk-691781f5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c5f3482fee79/vmlinux-691781f5.xz kernel image: https://storage.googleapis.com/syzbot-assets/63516279b1a1/bzImage-691781f5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ac877d1de3aa7263e7f4@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================================ UBSAN: shift-out-of-bounds in drivers/video/fbdev/core/fbcon.c:2489:33 shift exponent 38 is too large for 32-bit type 'int' CPU: 0 PID: 5087 Comm: syz-executor580 Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 ubsan_epilogue+0xa/0x31 lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x187 lib/ubsan.c:321 fbcon_set_font.cold+0x19/0x3c drivers/video/fbdev/core/fbcon.c:2489 con_font_set drivers/tty/vt/vt.c:4624 [inline] con_font_op+0xb52/0xf10 drivers/tty/vt/vt.c:4671 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x620/0x2df0 drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0x762/0x1670 drivers/tty/tty_io.c:2777 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fadea3c92c9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb231fd88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fadea3c92c9 RDX: 0000000020000040 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 00007fadea38d0b0 R08: 000000000000000d R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fadea38d140 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ================================================================================ --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
