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: 28651 Comm: syz-executor.0 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 : 84633d48 ip : 84633d48 fp : 84633d64 r10: 00000001 r9 : 00000fff r8 : 84898400 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: 85665600 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 84898400 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.0 (pid: 28651, stack limit = 0x84632000) Stack: (0x84633d48 to 0x84634000) 3d40: 824f1390 00000000 824f1390 a0000013 84633d94 84633d68 3d60: 808e3a80 808e1c1c 00001244 edafb000 84898400 824f1390 00000001 84898400 3d80: 824f1390 a0000013 84633da4 84633d98 808dac14 808e3950 84633dc4 84633da8 3da0: 808dcfcc 808dabd0 edaf9000 edafb26c 00000001 edaf9000 84633dd4 84633dc8 3dc0: 808dd03c 808dcf68 84633e54 84633dd8 808bd854 808dd038 00000000 ffffffff 3de0: ffffffff 00000000 ffffffff 84898474 00000001 00000fff 819082b0 55555556 3e00: 00000000 00000000 edafb000 84633e7c 00000001 84633e7c 00000000 edaf9000 3e20: 00000001 84633e7c 806782e4 00000000 85665740 84898400 808be758 00000009 3e40: 200004c0 84898400 84633e6c 84633e58 808be774 808bd478 00000000 816df1ac 3e60: 84633f14 84633e70 808b97e0 808be764 00000000 e7cfbc9f 01003231 00000000 3e80: 00000012 00000001 83d105f0 8557ab40 00000005 00000036 84633ef4 84633ea8 3ea0: 80687f08 8067dd48 00000001 00000054 00000012 84633ec4 847330d0 83491110 3ec0: 20005412 8557ab0b 84633eb8 8557ab40 00000005 e7cfbc9f 81f290f0 200004c0 3ee0: 8557ab40 e7cfbc9f 84633f14 00005412 00000000 8557ab41 200004c0 8557ab40 3f00: 00000005 83d105f0 84633fa4 84633f18 804a4910 808b8fc8 820a55ec 8209f3b0 3f20: 0012bfc8 857af300 857afa20 820a55f0 00000036 60000010 820a55e8 857af300 3f40: 820a55f0 00000036 84633f64 84633f58 816daf98 816dae64 84633f84 84633f68 3f60: 816dad20 816daf88 60000013 00000000 0012bfc8 e7cfbc9f 84633f9c 00000000 3f80: 00000000 0012bfc8 00000036 802002a4 857af300 00000036 00000000 84633fa8 3fa0: 80200060 804a480c 00000000 00000000 00000005 00005412 200004c0 00000000 3fc0: 00000000 00000000 0012bfc8 00000036 7eb2c312 76f2c6d0 7eb2c4a4 76f2c20c 3fe0: 76f2c020 76f2c010 000163a0 0004bf80 60000010 00000005 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 r5:84898400 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:edaf9000 r6:00000001 r5:edafb26c r4:edaf9000 [<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) r10:84898400 r9:200004c0 r8:00000009 r7:808be758 r6:84898400 r5:85665740 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) r10:83d105f0 r9:00000005 r8:8557ab40 r7:200004c0 r6:8557ab41 r5:00000000 r4:00005412 [<804a4800>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x84633fa8 to 0x84633ff0) 3fa0: 00000000 00000000 00000005 00005412 200004c0 00000000 3fc0: 00000000 00000000 0012bfc8 00000036 7eb2c312 76f2c6d0 7eb2c4a4 76f2c20c 3fe0: 76f2c020 76f2c010 000163a0 0004bf80 r10:00000036 r9:857af300 r8:802002a4 r7:00000036 r6:0012bfc8 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