syzbot

panic: ASan: Invalid access, 1-byte read at 0xfffffe0056b6a253, MallocRedZone(fb)
cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc7/frame 0xffffffff84f4fef0
kdb_backtrace() at kdb_backtrace+0xd3/frame 0xffffffff84f50050
vpanic() at vpanic+0x2c5/frame 0xffffffff84f50130
panic() at panic+0xb5/frame 0xffffffff84f50200
__asan_load1_noabort() at __asan_load1_noabort+0x11a/frame 0xffffffff84f502c0
ns8250_bus_probe() at ns8250_bus_probe+0xfc8/frame 0xffffffff84f50340
uart_bus_probe() at uart_bus_probe+0x3d6/frame 0xffffffff84f503d0
uart_acpi_probe() at uart_acpi_probe+0x2f1/frame 0xffffffff84f504c0
device_probe_child() at device_probe_child+0x375/frame 0xffffffff84f50560
device_probe() at device_probe+0x16c/frame 0xffffffff84f505b0
device_probe_and_attach() at device_probe_and_attach+0x3b/frame 0xffffffff84f505f0
bus_generic_attach() at bus_generic_attach+0x28/frame 0xffffffff84f50610
acpi_attach() at acpi_attach+0x1ade/frame 0xffffffff84f50810
device_attach() at device_attach+0x6ff/frame 0xffffffff84f50910
device_probe_and_attach() at device_probe_and_attach+0xe3/frame 0xffffffff84f50950
bus_generic_attach() at bus_generic_attach+0x28/frame 0xffffffff84f50970
device_attach() at device_attach+0x6ff/frame 0xffffffff84f50a80
device_probe_and_attach() at device_probe_and_attach+0xe3/frame 0xffffffff84f50ac0
bus_generic_new_pass() at bus_generic_new_pass+0x21e/frame 0xffffffff84f50b10
bus_set_pass() at bus_set_pass+0x12b/frame 0xffffffff84f50b50
configure() at configure+0x10/frame 0xffffffff84f50b70
mi_startup() at mi_startup+0x457/frame 0xffffffff84f50cb0
btext() at btext+0x22
KDB: enter: panic
[ thread pid 0 tid 100000 ]
Stopped at      kdb_enter+0x6b: movq    $0,0x28e6b8a(%rip)
db>