Hello, syzbot found the following issue on: HEAD commit: 4a57a8400075 vf/remap: return the amount of bytes actually.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1168fa9a080000 kernel config: https://syzkaller.appspot.com/x/.config?x=f7d589e916fa3bbe dashboard link: https://syzkaller.appspot.com/bug?extid=26e067dfa81f748d3210 compiler: aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+26e067dfa81f748d3210@xxxxxxxxxxxxxxxxxxxxxxxxx Internal error: synchronous external abort: 97140050 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 29340 Comm: syz-executor.1 Not tainted 5.19.0-rc6-syzkaller-00115-g4a57a8400075 #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:466 sp : ffff80000c263b40 x29: ffff80000c263b40 x28: f3ff0000265dd000 x27: 0000000000000000 x26: fbff000003d00528 x25: fdff000005bd3000 x24: f8ff000028c17000 x23: fbff000003d00528 x22: 0000000000000000 x21: ffff80000a6380e0 x20: 0000000000000008 x19: fffffbfffe800001 x18: 00000000fffffffb x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000020 x14: 0000000000000000 x13: ffff80000c263d78 x12: ffff80000c263d3a x11: 0000000000000000 x10: 0000000000000066 x9 : 000000000000005c x8 : 0000000000000000 x7 : 0000000000000001 x6 : ffff80000a2e0000 x5 : 0000000000005452 x4 : 0000000000000000 x3 : ffff80000a6380e0 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:466 serial_port_out include/linux/serial_core.h:270 [inline] serial8250_enable_ms drivers/tty/serial/8250/8250_port.c:1728 [inline] serial8250_enable_ms+0x68/0xa0 drivers/tty/serial/8250/8250_port.c:1715 uart_enable_ms drivers/tty/serial/serial_core.c:1179 [inline] uart_wait_modem_status+0xcc/0x2a0 drivers/tty/serial/serial_core.c:1207 uart_ioctl+0x1ec/0x894 drivers/tty/serial/serial_core.c:1437 tty_ioctl+0x1f4/0xd44 drivers/tty/tty_io.c:2778 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xa8/0xf0 fs/ioctl.c:856 __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+0xa0/0xc0 arch/arm64/kernel/syscall.c:206 el0_svc+0x44/0xb0 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x1ac/0x1b0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581 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 --- 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.
