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Date: Mon, 01 Apr 2013 19:22:32 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Fabian Keil <freebsd-listen@fabiankeil.de>
Subject: Re: panic: solaris assert: sa.sa_magic == 0x2F505A (0x4d5ea364 ==
 0x2f505a),
 file: /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c,
 line: 625
References: <20130401161813.6e42e2a1@fabiankeil.de>
 <5159A517.5070802@FreeBSD.org> <20130401175126.1d28b0f4@fabiankeil.de>
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on 01/04/2013 18:51 Fabian Keil said the following:
> vmcore.13:
> 
> (kgdb)  p *dn->dn_phys
> Cannot access memory at address 0xffffff8015eeb800
> (kgdb) p *dn->dn_dbuf
> $1 = {db = {db_object = 0, db_offset = 28491776, db_size = 16384, db_data = 0xffffff8015eeb000}, db_objset = 0xfffffe00691a5000, db_dnode_handle = 0xfffffe00691a5020, db_parent = 0xfffffe004254ab60, 
>   db_hash_next = 0x0, db_blkid = 1739, db_blkptr = 0xffffff8015d65580, db_level = 0 '\0', db_mtx = {lock_object = {lo_name = 0xffffffff811d8696 "db->db_mtx", lo_flags = 40960000, lo_data = 0, 
>       lo_witness = 0x0}, sx_lock = 1}, db_state = DB_CACHED, db_holds = {rc_count = 2}, db_buf = 0xfffffe0042bedcf0, db_changed = {cv_description = 0xffffffff811d86a2 "db->db_changed", cv_waiters = 0}, 
>   db_data_pending = 0xfffffe00406d6500, db_last_dirty = 0xfffffe00406d6500, db_link = {list_next = 0xfffffe0042758c10, list_prev = 0xfffffe0069cab5f8}, db_user_ptr = 0xfffffe0069f70000, 
>   db_user_data_ptr_ptr = 0x0, db_evict_func = 0xffffffff81105770 <dnode_buf_pageout>, db_immediate_evict = 0 '\0', db_freed_in_flight = 0 '\0', db_dirtycnt = 1 '\001'}

That's interesting.  So db.db_data has a bogus address.
Not sure how that could happen and what to make of it yet.

-- 
Andriy Gapon