[BUG BISECT] bug mm/vmalloc.c:470 (mm/vmalloc.c: get rid of one single unlink_va() when merge)

From: Krzysztof Kozlowski
Date: Mon Jun 03 2019 - 05:11:46 EST


On recent next I see bugs during boot (after bringing up user-space or
during reboot):
kernel BUG at ../mm/vmalloc.c:470!
On all my boards. On QEMU I see something similar, although the
message is "Internal error: Oops - undefined instruction: 0 [#1] ARM",

The calltrace is:
[ 34.565126] [<c0275c9c>] (__free_vmap_area) from [<c0276044>]
[ 34.573963] [<c0276044>] (__purge_vmap_area_lazy) from [<c0276d50>]
[ 34.582974] [<c0276d50>] (_vm_unmap_aliases) from [<c0279500>]
[ 34.590770] [<c0279500>] (__vunmap) from [<c01d5a70>]
[ 34.597955] [<c01d5a70>] (do_free_init) from [<c01478f4>]
[ 34.606018] [<c01478f4>] (process_one_work) from [<c0147f0c>]
[ 34.614077] [<c0147f0c>] (worker_thread) from [<c014e8b4>]
[ 34.621438] [<c014e8b4>] (kthread) from [<c01010b4>]

Full log here:

Bisect pointed to:
728e0fbf263e3ed359c10cb13623390564102881 is the first bad commit
commit 728e0fbf263e3ed359c10cb13623390564102881
Author: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Date: Sat Jun 1 12:20:19 2019 +1000
mm/vmalloc.c: get rid of one single unlink_va() when merge

1. Arch ARM Linux
2. exynos_defconfig
3. Exynos boards (Odroid XU3, etc), ARMv7, octa-core (Cortex-A7+A15),
Exynos5422 SoC
4. Systemd: v239, static IP set in kernel command line

Best regards,