Date: Fri, 22 Mar 2013 12:53:28 -0700 From: Navdeep Parhar <np@FreeBSD.org> To: Garrett Cooper <yaneurabeya@gmail.com> Cc: hhash@isilon.com, freebsd-net@FreeBSD.org Subject: Re: panic: 'Sleeping on "t4slptst" with the following non-sleepable locks held' when using cxgbe+lagg Message-ID: <514CB6B8.3050207@FreeBSD.org> In-Reply-To: <CAGHfRMBXaqHpoQ5QMs6XNb1dJx5OHoO8LhdJpud_hSTWGn1Q4g@mail.gmail.com> References: <CAGHfRMBXaqHpoQ5QMs6XNb1dJx5OHoO8LhdJpud_hSTWGn1Q4g@mail.gmail.com>
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Thanks for the bug report. I added this "t4 sleep test" sleep exactly for this purpose -- to catch cases where cxgbe(4) thinks it can sleep but it really can't. There is no need for a core, the stack has all the info I need. Regards, Navdeep On 03/22/13 12:43, Garrett Cooper wrote: > Unfortunately I don't have swap setup on this machine (not sure > why... I'll remedy that soon). Basically I was tcpdump'ing the > interface that was doing intense NFS I/O at the same time, and I ran > into this crash with cxgbe+lagg. Sources are a bit stale (~1.5 months > old). > Thanks, > -Garrett > > PS Please CC me as I don't receive emails from -net@. > > db> x/s version > version: FreeBSD 10.0-CURRENT #2 r+0db561c: Wed Feb 6 22:21:51 > PST 2013\012 > root@wf158.west.isilon.com:/usr/obj/usr/src/sys/ISI-GENERIC\012 > db> show msgbuf > msgbufp = 0xfffffe01bfffffb8 > magic = 63062, size = 98232, r= 290850, w = 293687, ptr = > 0xfffffe01bffe8000, cksum= 8071666 > Sleeping on "t4slptst" with the following non-sleepable locks held: > exclusive rw if_lagg rwlock (if_lagg rwlock) r = 0 > (0xfffffe01a66b3608) locked @ > /usr/src/sys/modules/if_lagg/../../net/if_lagg.c:1065 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffff8498e26490 > kdb_backtrace() at kdb_backtrace+0x39/frame 0xffffff8498e26540 > witness_warn() at witness_warn+0x4a8/frame 0xffffff8498e26600 > _sleep() at _sleep+0x6c/frame 0xffffff8498e26690 > begin_synchronized_op() at begin_synchronized_op+0x38/frame 0xffffff8498e266f0 > cxgbe_ioctl() at cxgbe_ioctl+0x77/frame 0xffffff8498e26740 > if_setflag() at if_setflag+0xe1/frame 0xffffff8498e267b0 > ifpromisc() at ifpromisc+0x2c/frame 0xffffff8498e267e0 > lagg_setflags() at lagg_setflags+0x65/frame 0xffffff8498e26820 > lagg_ioctl() at lagg_ioctl+0x3d0/frame 0xffffff8498e268c0 > if_setflag() at if_setflag+0xe1/frame 0xffffff8498e26930 > ifpromisc() at ifpromisc+0x2c/frame 0xffffff8498e26960 > bpfioctl() at bpfioctl+0x84c/frame 0xffffff8498e269e0 > devfs_ioctl_f() at devfs_ioctl_f+0xf0/frame 0xffffff8498e26a40 > kern_ioctl() at kern_ioctl+0x1ce/frame 0xffffff8498e26a90 > sys_ioctl() at sys_ioctl+0x11f/frame 0xffffff8498e26ae0 > amd64_syscall() at amd64_syscall+0x265/frame 0xffffff8498e26bf0 > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xffffff8498e26bf0 > --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x800fffeca, rsp = > 0x7fffffffd3a8, rbp = 0x7fffffffd980 --- > Sleeping thread (tid 100775, pid 64749) owns a non-sleepable lock > KDB: stack backtrace of thread 100775: > sched_switch() at sched_switch+0x481/frame 0xffffff8498e26550 > mi_switch() at mi_switch+0x179/frame 0xffffff8498e26590 > sleepq_switch() at sleepq_switch+0x18a/frame 0xffffff8498e265d0 > sleepq_timedwait() at sleepq_timedwait+0x43/frame 0xffffff8498e26600 > _sleep() at _sleep+0x32c/frame 0xffffff8498e26690 > begin_synchronized_op() at begin_synchronized_op+0x38/frame 0xffffff8498e266f0 > cxgbe_ioctl() at cxgbe_ioctl+0x77/frame 0xffffff8498e26740 > if_setflag() at if_setflag+0xe1/frame 0xffffff8498e267b0 > ifpromisc() at ifpromisc+0x2c/frame 0xffffff8498e267e0 > lagg_setflags() at lagg_setflags+0x65/frame 0xffffff8498e26820 > lagg_ioctl() at lagg_ioctl+0x3d0/frame 0xffffff8498e268c0 > if_setflag() at if_setflag+0xe1/frame 0xffffff8498e26930 > ifpromisc() at ifpromisc+0x2c/frame 0xffffff8498e26960 > bpfioctl() at bpfioctl+0x84c/frame 0xffffff8498e269e0 > devfs_ioctl_f() at devfs_ioctl_f+0xf0/frame 0xffffff8498e26a40 > kern_ioctl() at kern_ioctl+0x1ce/frame 0xffffff8498e26a90 > sys_ioctl() at sys_ioctl+0x11f/frame 0xffffff8498e26ae0 > amd64_syscall() at amd64_syscall+0x265/frame 0xffffff8498e26bf0 > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xffffff8498e26bf0 > --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x800fffeca, rsp = > 0x7fffffffd3a8, rbp = 0x7fffffffd980 --- > panic: sleeping thread > cpuid = 2 >
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