Internal error: synchronous external abort: 97140050 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 21857 Comm: syz-executor.1 Not tainted 5.17.0-rc7-syzkaller-00138-gc30b5b8cfb72 #0 Hardware name: linux,dummy-virt (DT) pstate: 804000c9 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __raw_writeb arch/arm64/include/asm/io.h:27 [inline] pc : _outb include/asm-generic/io.h:501 [inline] pc : logic_outb+0x3c/0xa4 lib/logic_pio.c:302 lr : io_serial_out+0x2c/0x3c drivers/tty/serial/8250/8250_port.c:458 sp : ffff80000e2a3bb0 x29: ffff80000e2a3bb0 x28: ffff80000e2a3d70 x27: faff000005ed0000 x26: 0000000000000fff x25: ffff80000e2952a0 x24: 0000000000000001 x23: ffff80000e293000 x22: 0000000000000001 x21: ffff80000e2a3d70 x20: 0000000000000002 x19: fffffbfffe800001 x18: 00000000fffffffb x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000020 x14: 0000000000000000 x13: ffff80000e2a3d78 x12: ffff80000e2a3d3a x11: 0000000000000000 x10: 0000000000000066 x9 : 0000000000000000 x8 : ffff80000e294260 x7 : 0000000000000000 x6 : 0000000000000001 x5 : faff000003cd84e0 x4 : 0000000000000000 x3 : ffff80000a5c5970 x2 : 0000000000000000 x1 : fffffbfffe800000 x0 : 0000000000ffbffe Call trace: _outb include/asm-generic/io.h:501 [inline] logic_outb+0x3c/0xa4 lib/logic_pio.c:302 io_serial_out+0x2c/0x3c drivers/tty/serial/8250/8250_port.c:458 serial_out drivers/tty/serial/8250/8250.h:120 [inline] serial8250_set_THRI drivers/tty/serial/8250/8250.h:140 [inline] __start_tx drivers/tty/serial/8250/8250_port.c:1568 [inline] serial8250_start_tx+0x94/0x18c drivers/tty/serial/8250/8250_port.c:1667 __uart_start.isra.0+0x3c/0x50 drivers/tty/serial/serial_core.c:127 uart_start+0x6c/0x10c drivers/tty/serial/serial_core.c:137 uart_flush_chars+0x10/0x20 drivers/tty/serial/serial_core.c:548 __receive_buf drivers/tty/n_tty.c:1553 [inline] n_tty_receive_buf_common+0x328/0x1260 drivers/tty/n_tty.c:1645 n_tty_receive_buf+0x14/0x20 drivers/tty/n_tty.c:1674 tiocsti drivers/tty/tty_io.c:2293 [inline] tty_ioctl+0x640/0xe14 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0xa8/0xec fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142 do_el0_svc+0x70/0x90 arch/arm64/kernel/syscall.c:181 el0_svc+0x20/0x80 arch/arm64/kernel/entry-common.c:603 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:621 el0t_64_sync+0x1ac/0x1b0 arch/arm64/kernel/entry.S:584 Code: d2bfd001 f2df7fe1 f2ffffe1 8b010273 (39000274) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d2bfd001 mov x1, #0xfe800000 // #4269801472 4: f2df7fe1 movk x1, #0xfbff, lsl #32 8: f2ffffe1 movk x1, #0xffff, lsl #48 c: 8b010273 add x19, x19, x1 * 10: 39000274 strb w20, [x19] <-- trapping instruction