On Thu, May 7, 2020 at 6:42 AM Qian Cai <c...@lca.pw> wrote: > > Running a Clang (9.0.1) build kernel with UBSAN generated a few warnings > during boot,
Very cool, these reports are so nice! They hand you everything on a silver platter. Thanks for testing/sending! Let's take a look. > > [ 0.000000] UBSAN: null-ptr-deref in drivers/acpi/acpica/tbfadt.c:459:37 > [ 0.000000] member access within null pointer of type 'struct > acpi_table_fadt' > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted > 5.7.0-rc4-next-20200507 #2 > [ 0.000000] Call trace: > [ 0.000000] dump_backtrace+0x0/0x22c > [ 0.000000] show_stack+0x28/0x34 > [ 0.000000] dump_stack+0x104/0x194 > [ 0.000000] handle_null_ptr_deref+0xdc/0x10c > [ 0.000000] __ubsan_handle_type_mismatch_v1+0x64/0x78 > [ 0.000000] acpi_tb_create_local_fadt+0x104/0x6ec ok so acpi_tb_create_local_fadt() dereferenced a `null pointer of type 'struct acpi_table_fadt'` in null-ptr-deref in drivers/acpi/acpica/tbfadt.c:459. That line number doesn't line up with linux-next; which tree was this? That will probably help track these down faster. > [ 0.000000] acpi_tb_parse_fadt+0xa0/0x1a0 > [ 0.000000] acpi_tb_parse_root_table+0x284/0x2ac > [ 0.000000] acpi_initialize_tables+0xb4/0xd0 > [ 0.000000] acpi_table_init+0x68/0x88 > [ 0.000000] acpi_boot_table_init+0x108/0x1a0 > [ 0.000000] setup_arch+0xec/0x1f4 > [ 0.000000] start_kernel+0x94/0x56c > > [ 0.000000] UBSAN: null-ptr-deref in arch/arm64/kernel/smp.c:596:6 > [ 0.000000] member access within null pointer of type 'struct > acpi_madt_generic_interrupt' > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted > 5.7.0-rc4-next-20200507 #2 > [ 0.000000] Call trace: > [ 0.000000] dump_backtrace+0x0/0x22c > [ 0.000000] show_stack+0x28/0x34 > [ 0.000000] dump_stack+0x104/0x194 > [ 0.000000] handle_null_ptr_deref+0xdc/0x10c > [ 0.000000] __ubsan_handle_type_mismatch_v1+0x64/0x78 > [ 0.000000] acpi_parse_gic_cpu_interface+0x40/0xa8 > [ 0.000000] acpi_parse_entries_array+0x1d4/0x2e8 > [ 0.000000] acpi_table_parse_entries_array+0x11c/0x138 > [ 0.000000] acpi_table_parse_madt+0x84/0xb0 > [ 0.000000] acpi_parse_and_init_cpus+0x24/0x80 > [ 0.000000] smp_init_cpus+0x38/0x17c > [ 0.000000] setup_arch+0x140/0x1f4 > [ 0.000000] start_kernel+0x94/0x56c > > [ 255.388250] UBSAN: null-ptr-deref in ./fs/xfs/xfs_sysfs.h:37:23 > [ 255.394898] member access within null pointer of type 'struct xfs_kobj' > [ 255.402346] CPU: 230 PID: 2364 Comm: modprobe Tainted: G L > 5.7.0-rc4-next-20200507 #2 > [ 255.412191] Hardware name: HPE Apollo 70 /C01_APACHE_MB > , BIOS L50_5.13_1.11 06/18/2019 > [ 255.422641] Call trace: > [ 255.425811] dump_backtrace+0x0/0x22c > [ 255.430188] show_stack+0x28/0x34 > [ 255.434225] dump_stack+0x104/0x194 > [ 255.438441] handle_null_ptr_deref+0xdc/0x10c > [ 255.443511] __ubsan_handle_type_mismatch_v1+0x64/0x78 > [ 255.450016] init_module+0x130/0x1d4 [xfs] > [ 255.454831] do_one_initcall+0x6c/0x144 > [ 255.459383] do_init_module+0x100/0x388 > [ 255.463931] load_module+0x2518/0x2b9c > [ 255.468404] __se_sys_finit_module+0x144/0x150 > [ 255.473560] __arm64_sys_finit_module+0x54/0x88 > [ 255.478804] do_el0_svc+0x128/0x1dc > [ 255.483010] el0_sync_handler+0xd0/0x268 > [ 255.487655] el0_sync+0x164/0x180 > [ 255.491782] > ================================================================================ > [ 255.769799] > ================================================================================ > [ 255.779164] UBSAN: null-ptr-deref in ./fs/xfs/xfs_sysfs.h:37:23 > [ 255.785816] member access within null pointer of type 'struct xfs_kobj' > [ 255.793268] CPU: 132 PID: 2363 Comm: mount Tainted: G L > 5.7.0-rc4-next-20200507 #2 > [ 255.802854] Hardware name: HPE Apollo 70 /C01_APACHE_MB > , BIOS L50_5.13_1.11 06/18/2019 > [ 255.813306] Call trace: > [ 255.816471] dump_backtrace+0x0/0x22c > [ 255.820849] show_stack+0x28/0x34 > [ 255.824882] dump_stack+0x104/0x194 > [ 255.829090] handle_null_ptr_deref+0xdc/0x10c > [ 255.834163] __ubsan_handle_type_mismatch_v1+0x64/0x78 > [ 255.840665] xfs_mountfs+0x310/0xc64 [xfs] > [ 255.846071] xfs_fc_fill_super+0x5cc/0x75c [xfs] > [ 255.851411] get_tree_bdev+0x24c/0x328 > [ 255.856463] xfs_fc_get_tree+0x24/0x30 [xfs] > [ 255.861453] vfs_get_tree+0x54/0x158 > [ 255.865754] do_mount+0x80c/0xaf0 > [ 255.869786] __arm64_sys_mount+0xe0/0x18c > [ 255.874510] do_el0_svc+0x128/0x1dc > [ 255.878720] el0_sync_handler+0xd0/0x268 > [ 255.883357] el0_sync+0x164/0x180 -- Thanks, ~Nick Desaulniers
