assertion error in ZFS

[Piotr Kubaj]

Hi,

I use ZFS compiled-in to the kernel in order to boot without loader.

After upgrade to LLVM9, it fails to mount with:
panic: solaris assert: (int32_t)n >= 0 (0xffffffffffffffff >= 0x0), file: /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zrlock.c, line: 115
cpuid = 16
time = 26
KDB: stack backtrace:
0xe0000000beff3c90: at kdb_backtrace+0x60
0xe0000000beff3da0: at vpanic+0x1d8
0xe0000000beff3e50: at panic+0x40
0xe0000000beff3e80: at assfail3+0x3c
0xe0000000beff3ef0: at zrl_remove+0x9c
0xe0000000beff3f20: at dbuf_read+0x73c
0xe0000000beff4080: at dnode_hold_impl+0x318
0xe0000000beff41d0: at dnode_hold+0x2c
0xe0000000beff4200: at dmu_buf_hold_noread+0x4c
0xe0000000beff4260: at dmu_buf_hold+0x3c
0xe0000000beff42b0: at zap_lockdir+0x60
0xe0000000beff4360: at zap_lookup_norm+0x78
0xe0000000beff4420: at zap_lookup+0x30
0xe0000000beff44a0: at dsl_dir_hold_obj+0x314
0xe0000000beff45b0: at dmu_objset_find_dp+0x2b8
0xe0000000beff4690: at dmu_objset_find_dp+0x7c4
0xe0000000beff46d0: at taskq_dispatch+0x12c
0xe0000000beff4700: at taskqueue_run+0x210
0xe0000000beff47d0: at taskqueue_thread_loop+0x108
0xe0000000beff4820: at fork_exit+0xc4
0xe0000000beff48c0: at fork_trampoline+0x18
0xe0000000beff48f0: at -0x4
KDB: enter: panic

This is with CURRENT on powerpc64.
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