Date: Sat, 17 Jun 2017 08:27:56 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 219846] [panic] [kevent] mutex nm_kn_lock not owned, netmap with INVARIANTS+WITNESS Message-ID: <bug-219846-8-fMO0NoEPCg@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-219846-8@https.bugs.freebsd.org/bugzilla/> References: <bug-219846-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219846 --- Comment #2 from Harald Schmalzbauer <bugzilla.freebsd@omnilan.de> --- Like kib@ suggested in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206053, I already tried to replacing 1 with 0 in the sys/dev/netmap/netmap_freebsd.c:netmap_kqfilter() at the call to knlist_add(), which does indeed prevent the initial panic (when the guest boots), but ends up in another panic short afterwards: (quoting my github report) panic: mutex nm_kn_lock owned at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:2176 cpuid = 6 KDB: stack backtrace: #0 0xffffffff805cb1a7 at kdb_backtrace+0x67 #1 0xffffffff8058b0e6 at vpanic+0x186 #2 0xffffffff8058b163 at panic+0x43 #3 0xffffffff8056c216 at __mtx_assert+0xc6 now: #4 0xffffffff80545219 at knote+0x39 #5 0xffffffff8041ebc7 at nm_os_selwakeup+0x87 #6 0xffffffff8041c94d at netmap_notify+0x1d #7 0xffffffff8041c701 at netmap_poll+0x821 #8 0xffffffff8041f63c at netmap_knrw+0x6c #9 0xffffffff805443d7 at kqueue_kevent+0x397 #10 0xffffffff80543fd6 at kern_kevent_fp+0x96 #11 0xffffffff80543eef at kern_kevent+0x9f #12 0xffffffff80543cf8 at sys_kevent+0x138 #13 0xffffffff80881b5a at amd64_syscall+0x57a #14 0xffffffff8086563b at Xfast_syscall+0xfb #0 doadump (textdump=<value optimized out>) at pcpu.h:222 #1 0xffffffff8058ab60 in kern_reboot (howto=260) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:366 #2 0xffffffff8058b120 in vpanic (fmt=<value optimized out>, ap=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:759 #3 0xffffffff8058b163 in panic (fmt=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:690 #4 0xffffffff8056c216 in __mtx_assert (c=<value optimized out>, what=<value optimized out>, file=<value optimized out>, line=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_mutex.c:1013 #5 0xffffffff80545219 in knote (list=<value optimized out>, hint=256, lockflags=0) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:2034 #6 0xffffffff8041ebc7 in nm_os_selwakeup (si=0xfffffe00088b94c0) at /usr/local/share/deploy-tools/RELENG_11/src/sys/dev/netmap/netmap_freebsd.c:1259 #7 0xffffffff8041c94d in netmap_notify (kring=<value optimized out>, flags=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/dev/netmap/netmap.c:2777 #8 0xffffffff8041c701 in netmap_poll (priv=<value optimized out>, events=<value optimized out>, sr=0x0) at /usr/local/share/deploy-tools/RELENG_11/src/sys/dev/netmap/netmap.c:2735 #9 0xffffffff8041f63c in netmap_knrw (kn=<value optimized out>, hint=<value optimized out>, events=1) at /usr/local/share/deploy-tools/RELENG_11/src/sys/dev/netmap/netmap_freebsd.c:1313 #10 0xffffffff805443d7 in kqueue_kevent (kq=0xfffff8001aa08600, td=0xfffff80141470560, nchanges=<value optimized out>, nevents=<value optimized out>, k_ops=0xfffffe045b5028a0, timeout=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:1700 #11 0xffffffff80543fd6 in kern_kevent_fp (td=0xfffff80141470560, fp=<value optimized out>, nchanges=0, nevents=<value optimized out>, k_ops=<value optimized out>, timeout=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:1050 #12 0xffffffff80543eef in kern_kevent (td=0xfffff80141470560, fd=6, nchanges=0, nevents=64, k_ops=0xfffffe045b5028a0, timeout=0x0) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:993 #13 0xffffffff80543cf8 in sys_kevent (td=0xfffff80141470560, uap=0xfffffe045b502a30) at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_event.c:925 #14 0xffffffff80881b5a in amd64_syscall (td=0xfffff80141470560, traced=0) at subr_syscall.c:135 #15 0xffffffff8086563b in Xfast_syscall () at /usr/local/share/deploy-tools/RELENG_11/src/sys/amd64/amd64/exception.S:396 #16 0x000000080122813a in ?? () -- You are receiving this mail because: You are the assignee for the bug.help
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