failed to run /usr/bin/make [make bzImage -j 32 CC=/syzkaller/gcc/bin/gcc]: exit status 2
scripts/kconfig/conf  --silentoldconfig Kconfig
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  HOSTCC  arch/x86/tools/relocs_32.o
  HOSTCC  arch/x86/tools/relocs_64.o
  HOSTCC  arch/x86/tools/relocs_common.o
  CHK     include/generated/utsrelease.h
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/pnmtologo
  HOSTCC  scripts/extract-cert
  CHK     scripts/mod/devicetable-offsets.h
  HOSTCC  scripts/selinux/genheaders/genheaders
  HOSTCC  scripts/selinux/mdp/mdp
  HOSTLD  arch/x86/tools/relocs
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  HOSTCC  usr/gen_init_cpio
  EXTRACT_CERTS   
  CHK     include/generated/compile.h
  AS      certs/system_certificates.o
  HOSTCC  arch/x86/entry/vdso/vdso2c
  AR      certs/built-in.o
  GEN     usr/initramfs_data.cpio
  AS      usr/initramfs_data.o
  CC      mm/zswap.o
  AR      usr/built-in.o
  VDSO2C  arch/x86/entry/vdso/vdso-image-64.c
  VDSO2C  arch/x86/entry/vdso/vdso-image-x32.c
  VDSO2C  arch/x86/entry/vdso/vdso-image-32.c
  CC      arch/x86/entry/vdso/vdso-image-64.o
  CC      arch/x86/entry/vdso/vdso-image-x32.o
  CC      arch/x86/entry/vdso/vdso-image-32.o
  LOGO    drivers/video/logo/logo_superh_mono.c
  CC      mm/vmpressure.o
  LOGO    drivers/video/logo/logo_linux_clut224.c
  CC      mm/swap_cgroup.o
  LOGO    drivers/video/logo/logo_linux_mono.c
  CC      mm/hugetlb_cgroup.o
  AR      arch/x86/entry/vdso/built-in.o
  AR      arch/x86/entry/built-in.o
  CC      mm/zpool.o
  AR      arch/x86/built-in.o
  CC      mm/zsmalloc.o
  LOGO    drivers/video/logo/clut_vga16.c
  LOGO    drivers/video/logo/logo_linux_vga16.c
  LOGO    drivers/video/logo/logo_superh_vga16.c
  LOGO    drivers/video/logo/logo_blackfin_vga16.c
  LOGO    drivers/video/logo/logo_mac_clut224.c
  LOGO    drivers/video/logo/logo_superh_clut224.c
  LOGO    drivers/video/logo/logo_sun_clut224.c
  CC      mm/early_ioremap.o
  CC      mm/balloon_compaction.o
  CC      mm/userfaultfd.o
  LOGO    drivers/video/logo/logo_parisc_clut224.c
  CC      mm/page_ext.o
  LOGO    drivers/video/logo/logo_blackfin_clut224.c
  LOGO    drivers/video/logo/logo_dec_clut224.c
mm/zswap.c: In function ‘zswap_frontswap_store’:
mm/zswap.c:1066:2: error: ‘hlen’ undeclared (first use in this function); did you mean ‘len’?
  hlen = zpool_shrinkable(entry->pool->zpool) ? sizeof(zhdr) : 0;
  ^~~~
  len
mm/zswap.c:1066:2: note: each undeclared identifier is reported only once for each function it appears in
mm/zswap.c:1004:33: warning: unused variable ‘len’ [-Wunused-variable]
  unsigned int dlen = PAGE_SIZE, len;
                                 ^~~
  LOGO    drivers/video/logo/logo_spe_clut224.c
  LOGO    drivers/video/logo/logo_m32r_clut224.c
  LOGO    drivers/video/logo/logo_sgi_clut224.c
  CC      mm/usercopy.o
  CC      drivers/video/logo/logo_linux_clut224.o
scripts/Makefile.build:310: recipe for target 'mm/zswap.o' failed
make[1]: *** [mm/zswap.o] Error 1
make[1]: *** Waiting for unfinished jobs....
  AR      drivers/video/logo/built-in.o
  AR      drivers/video/built-in.o
  AR      drivers/built-in.o
Makefile:1048: recipe for target 'mm' failed
make: *** [mm] Error 2