toolchain: LLVM 13.0.0
config: defconfig + fuzzing.config + kcsan.config
================================================================================
UBSAN: null-ptr-deref in ./include/linux/pagemap.h:1088:17
member access within null pointer of type 'struct folio'
CPU: 159 PID: 1940 Comm: fsck Not tainted 5.16.0-rc4-00002-g58b9ffdc5dc3 #1
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x224
 show_stack+0x38/0x48
 dump_stack_lvl+0x104/0x16c
systemd[1]: Mounting Kernel Configuration File System...
 dump_stack+0x1c/0x5c
 handle_null_ptr_deref+0x104/0x15c
 __ubsan_handle_type_mismatch_v1+0x7c/0xa4
 mpage_readahead+0x264/0x318
 blkdev_readahead+0x34/0x44
 read_pages+0xc4/0x2a8
 page_cache_ra_unbounded+0x340/0x3a4
 do_page_cache_ra+0xc4/0xdc
 force_page_cache_ra+0x15c/0x19c
 page_cache_sync_ra+0xe0/0x114
 filemap_read+0x32c/0xcb4
 generic_file_read_iter+0x8c/0x280
 blkdev_read_iter+0x98/0x158
 vfs_read+0x310/0x3d4
 ksys_read+0xe8/0x1a4
 __arm64_sys_read+0x58/0x6c
 invoke_syscall+0x78/0x1e0
 el0_svc_common+0xf8/0x1d8
 do_el0_svc+0x50/0xd4
 el0_svc+0x7c/0x24c
 el0t_64_sync_handler+0x84/0xe4
 el0t_64_sync+0x1a0/0x1a4
================================================================================