From c77fba9ab058d1e96ed51d4215e56905c9ef8d2a Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 21 May 2014 11:25:04 +0930 Subject: [PATCH] virtio_scsi: don't call virtqueue_add_sgs(... GFP_NOIO) holding spinlock. This triggers every time we do a SCSI abort: virtscsi_tmf -> virtscsi_kick_cmd (grab lock and call) -> virtscsi_add_cmd -> virtqueue_add_sgs (GFP_NOIO) Logs look like this: sd 0:0:0:0: [sda] abort BUG: sleeping function called from invalid context at mm/slub.c:966 in_atomic(): 1, irqs_disabled(): 1, pid: 6, name: kworker/u2:0 3 locks held by kworker/u2:0/6: #0: ("scsi_tmf_%d"shost->host_no){......}, at: [] process_one_work+0xe0/0x3d0 #1: ((&(&cmd->abort_work)->work)){......}, at: [] process_one_work+0xe0/0x3d0 #2: (&(&virtscsi_vq->vq_lock)->rlock){......}, at: [] virtscsi_kick_cmd+0x18/0x1b0 CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.15.0-rc5+ #110 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-rc1-0-gb1d4dc9-20140515_140003-nilsson.home.kraxel.org 04/01/2014 Workqueue: scsi_tmf_0 scmd_eh_abort_handler Signed-off-by: Rusty Russell Acked-by: Paolo Bonzini --- Reading git-format-patch failed