Re: kern/53059: "nvmectl identify nvme0" locks up system

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/53059; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/53059: "nvmectl identify nvme0" locks up system
Date: Tue, 27 Feb 2018 14:35:32 +0100

 I can reproduce it but luckily have a serial console.
 
 This is with Christos's latest change:
 
 nvme_poll() at netbsd:nvme_poll+0x12d
 nvmeioctl() at netbsd:nvmeioctl+0x19a
 cdev_ioctl() at netbsd:cdev_ioctl+0x98
 VOP_IOCTL() at netbsd:VOP_IOCTL+0x3b
 vn_ioctl() at netbsd:vn_ioctl+0xa1
 sys_ioctl() at netbsd:sys_ioctl+0x103
 syscall() at netbsd:syscall+0x1d8
 
 db{0}> sh reg
 ds          2b73
 es          8a78
 fs          55a6
 gs          6
 rdi         ffffffff81401260    x86_io
 rsi         3f8
 rbp         ffff800144b78a68
 rbx         ffff80001da4505c
 rdx         1
 rcx         8
 rax         7f
 r8          ffff800143841000
 r9          ffffffff806441cb    nvme_pt_fill
 r10         ffff800144b78ba0
 r11         10
 r12         800
 r13         f9
 r14         c6
 r15         ffffe4011daa0408
 rip         ffffffff8021db05    breakpoint+0x5
 cs          8
 rflags      202
 rsp         ffff800144b78a68
 ss          10
 netbsd:breakpoint+0x5:  leave
 
 
 (gdb) list *nvmeioctl+0x19a
 0xffffffff80644e65 is in nvmeioctl (../../../../dev/ic/nvme.c:971).
 [.. nvme_command_passthrough ..]
 
 (gdb) list *nvme_poll+0x12d
 0xffffffff80643fb2 is in nvme_poll (../../../../dev/ic/nvme.c:1043).
 1038            ccb->ccb_cookie = &state;
 1039    
 1040            nvme_q_submit(sc, q, ccb, nvme_poll_fill);
 1041            while (!ISSET(state.c.flags, htole16(NVME_CQE_PHASE))) {
 1042                    if (nvme_q_complete(sc, q) == 0)
 1043                            delay(step);
 1044    
 
 
 Martin