Bug 192082
| Summary: | [FreeBSD10 on Hyper-v] Panic at boot with kernel built with INVARIANTS & WITNESS | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Kylie <kyliel> |
| Component: | kern | Assignee: | Li-Wen Hsu <lwhsu> |
| Status: | Open --- | ||
| Severity: | Affects Some People | CC: | decui, lizzha, lwhsu, zlei |
| Priority: | --- | ||
| Version: | 10.0-RELEASE | ||
| Hardware: | amd64 | ||
| OS: | Any | ||
Canonicalize assignment. I suspect this one can be closed as OBE, while in the -CURRENT's GENERIC, we have INVARIANTS INVARIANT_SUPPORT WITNESS and also WITNESS_SKIPSPIN defined. I'll try to build a kernel without WITNESS_SKIPSPIN and test on Azure. |
Firstly, we reproduced this issue by following below steps. Furthermore, we uninstalled FreeBSD Integration Service driver which is to provide synthetic driver in FreeBSD VM running on Hyper-v, we still could reproduce this issue. 1. Boot vm on WS2012 R2 2. Download FreeBSD 10.0 source code 3. add following config into sys/amd64/conf/GENERIC options DDB options INVARIANTS options INVARIANT_SUPPORT options WITNESS 4. build and install kernel 5. reboot 6. panic: Timecounter "Hyper-V" frequency 10000000 Hz quality 10000000 panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx @ /usr/src/sys/kern/kern_cons.c:500 cpuid = 0 KDB: stack backtrace: #0 0xffffffff808e1b10 at kdb_backtrace+0x60 #1 0xffffffff808aa786 at vpanic+0x126 #2 0xffffffff808aa656 at kassert_panic+0x136 #3 0xffffffff80896936 at __mtx_lock_spin_flags+0x166 #4 0xffffffff80862bd2 at cnputs+0x32 #5 0xffffffff808e6eca at putchar+0x13a #6 0xffffffff808e5c5a at kvprintf+0xda #7 0xffffffff808e74e7 at vprintf+0x87 #8 0xffffffff808e7453 at printf+0x43 #9 0xffffffff808fa6c9 at witness_checkorder+0xa99 #10 0xffffffff80896865 at __mtx_lock_spin_flags+0x95 #11 0xffffffff80722b9b at uart_cnputc+0x3b #12 0xffffffff8086295f at cnputc+0x7f #13 0xffffffff80862bf8 at cnputs+0x58 #14 0xffffffff808e6eca at putchar+0x13a #15 0xffffffff808e5c5a at kvprintf+0xda #16 0xffffffff808e74e7 at vprintf+0x87 #17 0xffffffff808e7453 at printf+0x43 Note: If adding options WITNESS_SKIPSPIN when building kernel, the panic will not occur