Date: Sun, 22 Jan 2006 17:45:19 GMT From: Attila Nagy <bra@fsn.hu> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/92164: SCSI target mode LOR Message-ID: <200601221745.k0MHjIjq020935@www.freebsd.org> Resent-Message-ID: <200601221750.k0MHo3fT018137@freefall.freebsd.org>
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>Number: 92164 >Category: kern >Synopsis: SCSI target mode LOR >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Jan 22 17:50:03 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Attila Nagy >Release: 7-CURRENT >Organization: - >Environment: 7-CURRENT as of today. >Description: I'm doing some experiments with FreeBSD target mode support on Fibre Channel and thought that I should give CURRENT a try too. The machine itself is an HP BL25p with 8 GB of RAM (but hw.physmem set to under 4G, it seems the isp driver needs this) and dual Opterons. Running amd64 code. This is what I get after issuing scsi_target -A -S -T -W 32 2:0:0 /data/file1 lock order reversal: (sleepable after non-sleepable) 1st 0xffffffff808ce680 targ global (targ global) @ /usr/src/sys/cam/scsi/scsi_target.c:418 2nd 0xffffffff808e98c0 kernel environment (kernel environment) @ /usr/src/sys/kern/subr_hints.c:117 KDB: stack backtrace: witness_checkorder() at witness_checkorder+0x4f9 _sx_slock() at _sx_slock+0x4d res_find() at res_find+0x41a resource_find() at resource_find+0x7e resource_find_dev() at resource_find_dev+0x5f cam_periph_alloc() at cam_periph_alloc+0x1df targioctl() at targioctl+0x3a7 giant_ioctl() at giant_ioctl+0x65 devfs_ioctl_f() at devfs_ioctl_f+0x6f ioctl() at ioctl+0x147 syscall() at syscall+0x517 Xfast_syscall() at Xfast_syscall+0xa8 --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x800909aac, rsp = 0x7fffffffbb98, rbp = 0x7fffffffe700 --- >How-To-Repeat: >Fix: 6-STABLE works, at least the above command can be used without a LOR or panic. But there are some other concerns with target mode, which could be improved. >Release-Note: >Audit-Trail: >Unformatted:
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