FYI, we noticed the below changes on

commit 8faeb529b2dabb9df691d614dda18910a43d05c9 ("virtio-scsi: fix various bad behavior on aborted requests")

Some test crashes are fixed by this commit, but we found OOM at the same time.  The test case is xfstests.

testbox/testcase/testparams: vm-kbuild-1G/xfstests/4HDD-ext4-generic-slow2

cdda0e5acbb78f7b  8faeb529b2dabb9df691d614dd  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
           :30         100%          30:30    dmesg.Out_of_memory:Kill_process
           :30          36%          11:30    last_state.xfstests.exit_code.9
           :30           3%           1:30    last_state.xfstests.kill_code.9
         25:30         -83%            :30    dmesg.BUG:kernel_test_crashed
          5:30         -16%            :30    dmesg.kernel_BUG_at_block/blk-core.c
          5:30         -16%            :30    dmesg.invalid_opcode
          5:30         -16%            :30    dmesg.RIP:blk_finish_request
          5:30         -16%            :30    dmesg.Kernel_panic-not_syncing:Fatal_exception_in_interrupt

[  178.290439] sda: WRITE SAME failed. Manually zeroing.
[  180.488061] EXT4-fs (sdd): mounted filesystem with ordered data mode. Opts: acl,user_xattr
[  184.689327] EXT4-fs (sda): mounted filesystem with ordered data mode. Opts: acl,user_xattr
[  186.720974] 224 invoked oom-killer: gfp_mask=0x200da, order=0, oom_score_adj=0
[  186.722943] 224 cpuset=/ mems_allowed=0
[  186.724090] CPU: 0 PID: 4904 Comm: 224 Not tainted 3.18.0-gb2776bf #1
[  186.725321] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  186.726476]  0000000000000000 ffff880015a739d8 ffffffff819f1bb0 0000000000002695
[  186.728892]  ffff880036969bc0 ffff880015a73a58 ffffffff819f028b ffff880015a73a38
[  186.731138]  ffffffff814ac2bb 000000000000b7bc 000000000000b800 0000000000000000
[  186.733173] Call Trace:
[  186.733949]  [<ffffffff819f1bb0>] dump_stack+0x4e/0x68
[  186.735021]  [<ffffffff819f028b>] dump_header+0xa3/0x224
[  186.736140]  [<ffffffff814ac2bb>] ? trace_hardirqs_on_thunk+0x3a/0x3c
[  186.737381]  [<ffffffff8119f1ef>] oom_kill_process+0x73/0x36b
[  186.738543]  [<ffffffff8119ef25>] ? oom_unkillable_task+0xc0/0xe2
[  186.739737]  [<ffffffff810f1ed1>] ? has_ns_capability_noaudit+0x1f/0x2e
[  186.740999]  [<ffffffff8119fa86>] out_of_memory+0x42b/0x446
[  186.742121]  [<ffffffff811a42d2>] __alloc_pages_nodemask+0x860/0x8a9
[  186.743335]  [<ffffffff811dd88e>] alloc_pages_vma+0x10b/0x15f
[  186.744521]  [<ffffffff811c1c02>] do_wp_page+0x40a/0x772
[  186.745612]  [<ffffffff811c4b73>] handle_mm_fault+0xc0f/0xeae
[  186.746762]  [<ffffffff81073561>] __do_page_fault+0x38b/0x4c3
[  186.748249]  [<ffffffff81073712>] ? trace_do_page_fault+0x52/0xb7
[  186.749443]  [<ffffffff814ac2bb>] ? trace_hardirqs_on_thunk+0x3a/0x3c
[  186.750674]  [<ffffffff819f83f7>] ? _raw_spin_lock_irq+0x1a/0x50
[  186.752310]  [<ffffffff810f7f55>] ? do_sigaction+0xa2/0x171
[  186.754150]  [<ffffffff810f429b>] ? recalc_sigpending+0x17/0x4c
[  186.755560]  [<ffffffff81073712>] trace_do_page_fault+0x52/0xb7
[  186.756766]  [<ffffffff8106dd57>] do_async_page_fault+0x31/0x67
[  186.757942]  [<ffffffff819fa838>] async_page_fault+0x28/0x30
[  186.766685] Mem-Info:
[  186.767419] Node 0 DMA per-cpu:
[  186.768350] CPU    0: hi:    0, btch:   1 usd:   0

Thanks,
Fengguang