8<--- cut here --- Unable to handle kernel paging request at virtual address fee00001 [fee00001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 15887 Comm: syz-executor.1 Not tainted 5.17.0-rc8-syzkaller #0 Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at io_serial_out+0x38/0x40 drivers/tty/serial/8250/8250_port.c:458 LR is at io_serial_out+0x24/0x40 drivers/tty/serial/8250/8250_port.c:458 pc : [<808e1c48>] lr : [<808e1c34>] psr: 60000093 sp : 84cefd48 ip : 84cefd48 fp : 84cefd64 r10: 00000001 r9 : 00000fff r8 : 8297ec00 r7 : a0000013 r6 : 824f1390 r5 : 00000002 r4 : fee00001 r3 : 00000000 r2 : 00000002 r1 : 00000000 r0 : 824f1390 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85764540 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: NULL pointer Register r4 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1028 Register r5 information: non-paged memory Register r6 information: non-slab/vmalloc memory Register r7 information: non-slab/vmalloc memory Register r8 information: slab kmalloc-512 start 8297ec00 pointer offset 0 size 512 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: non-slab/vmalloc memory Register r12 information: non-slab/vmalloc memory Process syz-executor.1 (pid: 15887, stack limit = 0x84cee000) Stack: (0x84cefd48 to 0x84cf0000) fd40: 824f1390 00000000 824f1390 a0000013 84cefd94 84cefd68 fd60: 808e3a80 808e1c1c 808b6478 808decb8 eda60000 824f1390 00000001 8297ec00 fd80: 824f1390 a0000013 84cefda4 84cefd98 808dac14 808e3950 84cefdc4 84cefda8 fda0: 808dcfcc 808dabd0 eda60000 eda6226c 000000f8 eda60000 84cefdd4 84cefdc8 fdc0: 808dd03c 808dcf68 84cefe54 84cefdd8 808bd854 808dd038 00000000 ffffffff fde0: ffffffff 00000000 ffffffff 8297ec74 00000001 00000fff 819082b0 55555556 fe00: 00000000 00000000 eda62000 84cefe7c 00000001 84cefe7c 00000000 eda60000 fe20: 00000001 84cefe7c 806782e4 00000000 85558980 8297ec00 808be758 00000009 fe40: 20000bc0 8297ec00 84cefe6c 84cefe58 808be774 808bd478 00000000 816df1ac fe60: 84ceff14 84cefe70 808b97e0 808be764 00000000 e7cfbc9f f8003231 00000000 fe80: 00000012 00000001 83b90f78 85007780 00000003 00000036 84cefef4 84cefea8 fea0: 80687f08 8067dd48 00000001 00000054 00000012 84cefec4 839c2790 8348f550 fec0: 20005412 8500770b 84cefeb8 85007780 00000003 e7cfbc9f 81f290f0 20000bc0 fee0: 85007780 e7cfbc9f 84ceff14 00005412 00000000 85007781 20000bc0 85007780 ff00: 00000003 83b90f78 84ceffa4 84ceff18 804a4910 808b8fc8 820a55ec 8209f3b0 ff20: 0012c178 8395f300 8395fa20 820a55f0 00000036 60000010 820a55e8 8395f300 ff40: 820a55f0 00000036 84ceff64 84ceff58 816daf98 816dae64 84ceff84 84ceff68 ff60: 816dad20 816daf88 60000013 00000000 0012c178 e7cfbc9f 84ceff9c 00000000 ff80: 00000000 0012c178 00000036 802002a4 8395f300 00000036 00000000 84ceffa8 ffa0: 80200060 804a480c 00000000 00000000 00000003 00005412 20000bc0 00000000 ffc0: 00000000 00000000 0012c178 00000036 7ed62312 76f106d0 7ed624a4 76f1020c ffe0: 76f10020 76f10010 000163a0 0004bf80 60000010 00000003 00000000 00000000 Backtrace: [<808e1c10>] (io_serial_out) from [<808e3a80>] (serial_out drivers/tty/serial/8250/8250.h:120 [inline]) [<808e1c10>] (io_serial_out) from [<808e3a80>] (serial8250_set_THRI drivers/tty/serial/8250/8250.h:140 [inline]) [<808e1c10>] (io_serial_out) from [<808e3a80>] (__start_tx drivers/tty/serial/8250/8250_port.c:1568 [inline]) [<808e1c10>] (io_serial_out) from [<808e3a80>] (serial8250_start_tx+0x13c/0x234 drivers/tty/serial/8250/8250_port.c:1667) r7:a0000013 r6:824f1390 r5:00000000 r4:824f1390 [<808e3944>] (serial8250_start_tx) from [<808dac14>] (__uart_start+0x50/0x54 drivers/tty/serial/serial_core.c:127) r7:a0000013 r6:824f1390 r5:8297ec00 r4:00000001 [<808dabc4>] (__uart_start) from [<808dcfcc>] (uart_start+0x70/0xd0 drivers/tty/serial/serial_core.c:137) [<808dcf5c>] (uart_start) from [<808dd03c>] (uart_flush_chars+0x10/0x14 drivers/tty/serial/serial_core.c:548) r7:eda60000 r6:000000f8 r5:eda6226c r4:eda60000 [<808dd02c>] (uart_flush_chars) from [<808bd854>] (__receive_buf drivers/tty/n_tty.c:1553 [inline]) [<808dd02c>] (uart_flush_chars) from [<808bd854>] (n_tty_receive_buf_common+0x3e8/0x12c8 drivers/tty/n_tty.c:1645) [<808bd46c>] (n_tty_receive_buf_common) from [<808be774>] (n_tty_receive_buf+0x1c/0x24 drivers/tty/n_tty.c:1674) r10:8297ec00 r9:20000bc0 r8:00000009 r7:808be758 r6:8297ec00 r5:85558980 r4:00000000 [<808be758>] (n_tty_receive_buf) from [<808b97e0>] (tiocsti drivers/tty/tty_io.c:2293 [inline]) [<808be758>] (n_tty_receive_buf) from [<808b97e0>] (tty_ioctl+0x824/0xa90 drivers/tty/tty_io.c:2692) [<808b8fbc>] (tty_ioctl) from [<804a4910>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<808b8fbc>] (tty_ioctl) from [<804a4910>] (do_vfs_ioctl fs/ioctl.c:834 [inline]) [<808b8fbc>] (tty_ioctl) from [<804a4910>] (__do_sys_ioctl fs/ioctl.c:872 [inline]) [<808b8fbc>] (tty_ioctl) from [<804a4910>] (sys_ioctl+0x110/0xaa0 fs/ioctl.c:860) r10:83b90f78 r9:00000003 r8:85007780 r7:20000bc0 r6:85007781 r5:00000000 r4:00005412 [<804a4800>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x84ceffa8 to 0x84cefff0) ffa0: 00000000 00000000 00000003 00005412 20000bc0 00000000 ffc0: 00000000 00000000 0012c178 00000036 7ed62312 76f106d0 7ed624a4 76f1020c ffe0: 76f10020 76f10010 000163a0 0004bf80 r10:00000036 r9:8395f300 r8:802002a4 r7:00000036 r6:0012c178 r5:00000000 r4:00000000 Code: e6ef5075 e0844001 e7f34054 e2444612 (e5c45000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef5075 uxtb r5, r5 4: e0844001 add r4, r4, r1 8: e7f34054 ubfx r4, r4, #0, #20 c: e2444612 sub r4, r4, #18874368 ; 0x1200000 * 10: e5c45000 strb r5, [r4] <-- trapping instruction