FYI: one more way to run xfstest

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Today I've run xfstest in parallel with fsfreze/fsthaw like follows
# I use dmsetup {suspend,resume} which does fsfreeze/fsthaw and other
# dm's speciffic stuff (which is not related in that case)
(while true ;do dmsetup suspend $TEST_DEV ;dmsetup resume $TEST_DEV;done)&
(while true ;do dmsetup suspend $SCRATCH_DEV ;dmsetup resume $SCRATCH_DEV;done)&
# And later as usual
./check -g auto
I use origin/dev (current dev HEAD): c902ed2d06a

Quickly it spots a lot of traces from incorrect freeze-api state:
------------[ cut here ]------------
WARNING: at fs/ext4/ext4_jbd2.c:50 __ext4_journal_start_sb+0x132/0x240()
Hardware name:         
Modules linked in: cpufreq_ondemand acpi_cpufreq freq_table mperf coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode sg xhci_hcd button sd_mod crc_t10dif aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul ahci libahci pata_acpi ata_generic dm_mirror dm_region_hash dm_log dm_mod
Pid: 29760, comm: fsx Not tainted 3.8.0-rc3+ #98
Call Trace:
[<ffffffff8106fb0d>] warn_slowpath_common+0xad/0xf0
[<ffffffff81344f97>] ? ext4_da_write_begin+0x277/0x4f0
[<ffffffff8106fb6a>] warn_slowpath_null+0x1a/0x20
[<ffffffff8138a122>] __ext4_journal_start_sb+0x132/0x240
[<ffffffff81344f97>] ext4_da_write_begin+0x277/0x4f0
[<ffffffff811a0668>] generic_perform_write+0x148/0x3c0
[<ffffffff811a0944>] generic_file_buffered_write+0x64/0xd0
[<ffffffff811a5c90>] __generic_file_aio_write+0x4d0/0x750
[<ffffffff81335da3>] ext4_file_dio_write+0x253/0x4e0
[<ffffffff81336101>] ext4_file_write+0xd1/0x190
[<ffffffff81243072>] do_sync_write+0xb2/0x120
[<ffffffff8124332c>] ? rw_verify_area+0x12c/0x270
[<ffffffff812435f2>] vfs_write+0x182/0x1f0
[<ffffffff818ff605>] ? sysret_check+0x22/0x5d
[<ffffffff812445f4>] sys_write+0x94/0xd0
[<ffffffff818ff5d9>] system_call_fastpath+0x16/0x1b
---[ end trace be4bc73619d3477b ]---
------------[ cut here ]------------

Also it find destroyed object in the list:
------------[ cut here ]------------
WARNING: at lib/list_debug.c:62 __list_del_entry+0x1c0/0x250()
Hardware name:         
list_del corruption. prev->next should be ffff8801fbb747c8, but was 6b6b6b6b6b6b6b6b
Modules linked in: cpufreq_ondemand acpi_cpufreq freq_table mperf coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode sg xhci_hcd button sd_mod crc_t10dif aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul ahci libahci pata_acpi ata_generic dm_mirror dm_region_hash dm_log dm_mod
Pid: 13297, comm: jbd2/dm-3-8 Tainted: G        W    3.8.0-rc3+ #98
Call Trace:
[<ffffffff8106fb0d>] warn_slowpath_common+0xad/0xf0
[<ffffffff8106fc06>] warn_slowpath_fmt+0x46/0x50
[<ffffffff81363689>] ? ext4_journal_commit_callback+0x99/0xc0
[<ffffffff8148c980>] __list_del_entry+0x1c0/0x250
[<ffffffff8136365f>] ext4_journal_commit_callback+0x6f/0xc0
[<ffffffff813ca1d6>] jbd2_journal_commit_transaction+0x23a6/0x2570
[<ffffffff8108aa42>] ? try_to_del_timer_sync+0x82/0xa0
[<ffffffff8108b491>] ? del_timer_sync+0x91/0x1e0
[<ffffffff813d3d6f>] kjournald2+0x19f/0x6a0
[<ffffffff810ad630>] ? wake_up_bit+0x40/0x40
[<ffffffff813d3bd0>] ? bit_spin_lock+0x80/0x80
[<ffffffff810ac6be>] kthread+0x10e/0x120
[<ffffffff810ac5b0>] ? __init_kthread_worker+0x70/0x70
[<ffffffff818ff52c>] ret_from_fork+0x7c/0xb0
[<ffffffff810ac5b0>] ? __init_kthread_worker+0x70/0x70
---[ end trace be4bc73619d357f9 ]---

Right now I work on this issues. But I just want to let you know about
this.
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