Hi Thomas, On Tue, Jan 21, 2020 at 08:47:44PM +0100, Thomas Klausner wrote:
> During a bulk build (in rust AFAICT), I got a panic with > panic: kernel diagnostic assertion "ci->ci_biglock_count == 0" failed: file > "/usr/src/sys/sys/userret.h", line 88 > > That's this one: > > static __inline void > mi_userret(struct lwp *l) > { > struct cpu_info *ci; > > KPREEMPT_DISABLE(l); > ci = l->l_cpu; > KASSERT(l->l_blcnt == 0); > KASSERT(ci->ci_biglock_count == 0); > > > > The backtrace in the crash dump is not very helpful: > > (gdb) bt > #0 0xffffffff80224315 in cpu_reboot (howto=howto@entry=260, > bootstr=bootstr@entry=0x0) at /usr/src/sys/arch/amd64/amd64/machdep.c:720 > #1 0xffffffff809f5ec3 in kern_reboot (howto=howto@entry=260, > bootstr=bootstr@entry=0x0) at /usr/src/sys/kern/kern_reboot.c:61 > #2 0xffffffff80a37109 in vpanic (fmt=0xffffffff8135e980 "kernel %sassertion > \"%s\" failed: file \"%s\", line %d ", ap=ap@entry=0xffffad0928973f48) > at /usr/src/sys/kern/subr_prf.c:336 > #3 0xffffffff80e7b0b3 in kern_assert (fmt=fmt@entry=0xffffffff8135e980 > "kernel %sassertion \"%s\" failed: file \"%s\", line %d ") > at /usr/src/sys/lib/libkern/kern_assert.c:51 > #4 0xffffffff802568ce in mi_userret (l=0xffffcfc320ca9c00) at > /usr/src/sys/sys/userret.h:91 > #5 userret (l=0xffffcfc320ca9c00) at ./machine/userret.h:81 > #6 syscall (frame=<optimized out>) at /usr/src/sys/arch/x86/x86/syscall.c:166 > #7 0xffffffff802096ad in handle_syscall () hannken@ supplied me with a repro for this one so I'm going to look into it tomorrow morning. syzbot has also run into it recently. Andrew