Hello, syzbot found the following issue on: HEAD commit: 2e530aeb342b Merge branch 'for-next/core', remote-tracking.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=121c1fe6680000 kernel config: https://syzkaller.appspot.com/x/.config?x=5cc95add722fb0c1 dashboard link: https://syzkaller.appspot.com/bug?extid=524697c54d6e7ec67cf2 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b93281680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1076e749680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2468ab4c933e/disk-2e530aeb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd3708bf8a20/vmlinux-2e530aeb.xz kernel image: https://storage.googleapis.com/syzbot-assets/86bc7d3468f9/Image-2e530aeb.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+524697c54d6e7ec67cf2@xxxxxxxxxxxxxxxxxxxxxxxxx Unable to handle kernel paging request at virtual address dfff800000000040 KASAN: null-ptr-deref in range [0x0000000000000200-0x0000000000000207] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000040] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6015 Comm: syz-executor865 Not tainted 6.6.0-rc3-syzkaller-g2e530aeb342b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __fb_pad_aligned_buffer include/linux/fb.h:629 [inline] pc : bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] pc : bit_putcs+0x958/0xe30 drivers/video/fbdev/core/bitblit.c:185 lr : __fb_pad_aligned_buffer include/linux/fb.h:626 [inline] lr : bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] lr : bit_putcs+0x93c/0xe30 drivers/video/fbdev/core/bitblit.c:185 sp : ffff800096a974a0 x29: ffff800096a976b0 x28: 0000000000000200 x27: ffff0000c8fb9010 x26: ffff0000c8fb9010 x25: 000000000000000f x24: dfff800000000000 x23: 0000000000000080 x22: 0000000000000000 x21: 0000000000000000 x20: ffff0000c0032440 x19: 0000000000000200 x18: ffff800096a96dc0 x17: ffff80008e19d000 x16: ffff80008a576f00 x15: 0000000000000009 x14: 1ffff00012d52ec1 x13: 0000000000000000 x12: 00000000ffffffff x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000040 x7 : 0000000000000000 x6 : 0000000000000007 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000831e57e8 x2 : 0000000000000800 x1 : 0000000000000010 x0 : 0000000000000000 Call trace: __fb_pad_aligned_buffer include/linux/fb.h:629 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0x958/0xe30 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x318/0x4e8 drivers/video/fbdev/core/fbcon.c:1282 do_update_region+0x42c/0x5f8 drivers/tty/vt/vt.c:623 redraw_screen+0x82c/0xd54 drivers/tty/vt/vt.c:983 fbcon_modechanged+0x9f4/0x1090 drivers/video/fbdev/core/fbcon.c:2703 fbcon_update_vcs+0x3c/0x4c drivers/video/fbdev/core/fbcon.c:2748 do_fb_ioctl+0xa68/0xd24 drivers/video/fbdev/core/fb_chrdev.c:92 fb_ioctl+0xec/0x134 drivers/video/fbdev/core/fb_chrdev.c:169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Code: 51000679 aa1c03f3 d343fe68 12000a69 (38f86908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 51000679 sub w25, w19, #0x1 4: aa1c03f3 mov x19, x28 8: d343fe68 lsr x8, x19, #3 c: 12000a69 and w9, w19, #0x7 * 10: 38f86908 ldrsb w8, [x8, x24] <-- trapping instruction --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
