I saw this on my "build machine" after updating the "head" slice from: FreeBSD 11.0-CURRENT #1387 r260875M/260877:1100005: Sun Jan 19 11:57:25 PST 2014 root_at_freebeast.catwhisker.org:/common/S4/obj/usr/src/sys/GENERIC i386 to FreeBSD 11.0-CURRENT #1388 r260904M/260904:1100005: Mon Jan 20 06:25:53 PST 2014 root_at_freebeast.catwhisker.org:/common/S4/obj/usr/src/sys/GENERIC i386 A bit of context: On this machine and my laptop, it is my practice to perform the following on a daily basis: * Ensure the machine is booted from slice 1 (stable/9). * Update the ports tree. * Update the source tree. * Start fetching any ports that are to be updated. * Update stable/9. * Reboot (staying on slice 1 -- stable/9). * Update the installed ports that warrant it ("portmaster -da --index"). * Update the sources on slice 3 (stable/10). * Remove old libraries for stable/9 ("make delete-old-libs"). * Reboot to slice 3 (stable/10). * Update stable/10. * Reboot (staying on slice 3 -- stable/10). * Update the sources on slice 4 (head). * Remove old libraries for stable/10 ("make delete-old-libs"). * Reboot to slice 4 (head) * Update head. * Reboot (staying on slice 4 -- head). * Remove old libraries for head ("make delete-old-libs"). [If a given slice didn't have source updates, I don't try to rebuild FreeBSD on it, though.] For my laptop, I then reboot to slice 1 (usually; sometimes slice 3, especially if there were no source updates for stable/9). For the build machine, I set the default boot slice back to 1, then issue "shutdown -p now" to shut it off until just before midnight. Today, there were a couple of perturbations from the above: * The only update for stable/10 I had was: U /S3/usr/src/release/doc/en_US.ISO8859-1/errata/article.xml so I decided that didn't warrant rebuilding FreeBSD stable/10. * The panic in the Subject line -- only on the build machine. Here's what I see (cut/paste) on serial console: ... Jan 20 07:02:12 freebeast shutdown: power-down by david: Stopping cron. Waiting for PIDS: 1090. Stopping sshd. Waiting for PIDS: 1080. Stopping rsyncd. Waiting for PIDS: 1057. Stopping powerd. Waiting for PIDS: 1042. sysctl: dev.cpu.0.freq=3600: Device not configured Stopping ntpd. Waiting for PIDS: 1039. Stopping lpd. Waiting for PIDS: 1018. Stopping lockd. Waiting for PIDS: 1001. Stopping statd. Waiting for PIDS: 998. Stopping nfsd. Waiting for PIDS: 994 995. Stopping mountd. Waiting for PIDS: 992. Stopping casperd. Waiting for PIDS: 951. Stopping amd. Waiting for PIDS: 943. Stopping ypbind. Stopping rpcbind. Waiting for PIDS: 916, 916. Stopping devd. Writing entropy file:. Terminated . Jan 20 07:02:16 freebeast syslogd: exiting on signal 15 Waiting (max 60 seconds) for system process `vnlru' to stop...done Waiting (max 60 seconds) for system process `syncer' to stop... Syncing disks, vnodes remaining...2 4 4 4 3 3 3 2 1 1 0 0 0 0 done Waiting (max 60 seconds) for system process `bufdaemon' to stop...done All buffers synced. lock order reversal: 1st 0xc7336c68 ufs (ufs) _at_ /usr/src/sys/kern/vfs_mount.c:1237 2nd 0xc76846dc devfs (devfs) _at_ /usr/src/sys/ufs/ffs/ffs_vfsops.c:1412 KDB: stack backtrace: db_trace_self_wrapper(c112d57c,a3231,e1fb9888,c0b1bfe7,1,...) at db_trace_self_wrapper+0x2d/frame 0xe1fb9828 kdb_backtrace(c1131131,c76846dc,c1124024,c6dad2d0,c1162dc1,...) at kdb_backtrace+0x30/frame 0xe1fb9890 witness_checkorder(c76846dc,9,c1162dc1,584,0,...) at witness_checkorder+0xc8a/frame 0xe1fb98e0 __lockmgr_args(c76846dc,80400,c76846fc,0,0,0,c1162dc1,584) at __lockmgr_args+0x844/frame 0xe1fb99b4 vop_stdlock(e1fb9a28,c6dad3a0,c6dad408,c169bc38,e1fb9a4c,...) at vop_stdlock+0x4d/frame 0xe1fb99e4 VOP_LOCK1_APV(c13828dc,e1fb9a28,0,0,c13cded0,...) at VOP_LOCK1_APV+0x104/frame 0xe1fb9a10 _vn_lock(c76846a8,80400,c1162dc1,584,c1393aac,...) at _vn_lock+0xa1/frame 0xe1fb9a50 ffs_flushfiles(c753f000,a,c6f0a310,e1fb9b38,c0d416e3,...) at ffs_flushfiles+0x14c/frame 0xe1fb9a9c softdep_flushfiles(c753f000,2,c6f0a310,0,0,...) at softdep_flushfiles+0x6e/frame 0xe1fb9af0 ffs_unmount(c753f000,80000,e1fb9b70,518,c6f0a310,...) at ffs_unmount+0x194/frame 0xe1fb9b38 dounmount(c753f000,80000,c6f0a310,0,e1db3eb0,...) at dounmount+0x4dc/frame 0xe1fb9b98 vfs_unmountall(e1db4058,0,c112895a,144,c6d8b1a0,...) at vfs_unmountall+0x4e/frame 0xe1fb9bb8 kern_reboot(4008,0,c112895a,c3,0,...) at kern_reboot+0x5af/frame 0xe1fb9c20 sys_reboot(c6f0a310,e1fb9cc8,14,c112b5b7,7a2,...) at sys_reboot+0x6f/frame 0xe1fb9c40 syscall(e1fb9d08) at syscall+0x2de/frame 0xe1fb9cfc Xint0x80_syscall() at Xint0x80_syscall+0x21/frame 0xe1fb9cfc --- syscall (55, FreeBSD ELF32, sys_reboot), eip = 0x805a9df, esp = 0xbfbfd88c, ebp = 0xbfbfd960 --- Uptime: 4m28s panic: mtx_lock_spin: recursed on non-recursive mutex uart_hwmtx _at_ /usr/src/sys/dev/uart/uart_cpu.h:94 cpuid = 0 KDB: stack backtrace: db_trace_self_wrapper(c112d57c,2f727375,2f637273,2f737973,2f766564,...) at db_trace_self_wrapper+0x2d/frame 0xe1fb9a60 kdb_backtrace(c12ec1f3,0,c11269a2,e1fb9b38,e1fb9b08,...) at kdb_backtrace+0x30/frame 0xe1fb9ac8 vpanic(c140d0c8,100,c11269a2,e1fb9b38,e1fb9b38,...) at vpanic+0x11f/frame 0xe1fb9b08 kassert_panic(c11269a2,c10f66d8,c10f6758,5e,8,...) at kassert_panic+0xea/frame 0xe1fb9b2c __mtx_lock_spin_flags(c7291830,0,c10f6758,5e,c137d684,...) at __mtx_lock_spin_flags+0x190/frame 0xe1fb9b5c ns8250_bus_grab(c7291800,c7062b28,c137d684,5e,c140b9a4,...) at ns8250_bus_grab+0x40/frame 0xe1fb9b78 uart_grab(c13fd070) at uart_grab+0x83/frame 0xe1fb9b9c uart_cngrab(c137d69c,88888889,e1fb9c20,c0ac7d43,c1128e43,...) at uart_cngrab+0x12/frame 0xe1fb9ba8 cngrab(c1128e43,1c,c112895a,144,c6d8b1a0,...) at cngrab+0x33/frame 0xe1fb9bb8 kern_reboot(4008,0,c112895a,c3,0,...) at kern_reboot+0x6d3/frame 0xe1fb9c20 sys_reboot(c6f0a310,e1fb9cc8,14,c112b5b7,7a2,...) at sys_reboot+0x6f/frame 0xe1fb9c40 syscall(e1fb9d08) at syscall+0x2de/frame 0xe1fb9cfc Xint0x80_syscall() at Xint0x80_syscall+0x21/frame 0xe1fb9cfc --- syscall (55, FreeBSD ELF32, sys_reboot), eip = 0x805a9df, esp = 0xbfbfd88c, ebp = 0xbfbfd960 --- KDB: enter: panic [ thread pid 1 tid 100002 ] Stopped at kdb_enter+0x3d: movl $0,kdb_why db> show locks exclusive sleep mutex Giant (Giant) r = 0 (0xc1724910) locked _at_ /usr/src/sys/vm/swap_pager.c:2365 db> When I issued "reset", the machine came back up normally (in slice 1 -- stable/9). I then rebooted to slice 4 (head), and issued the same commands I usually do to set the default boot slice back to 1, then "shutdown -p now" -- and re-created the panic. I can leave the machine up for a while if anyone has suggestions for me to poke around. I have a local private mirror of the FreeBSD SVN repos and a spare bootable slice; I'm williing to try patches. The machine isn't especially fast, but it's generally OK. If it would be worthwhile, I could reboot my laptop to slice 4 (head) & attempt the same reset-to-slice-1-default & power-off. This definitely did not happen _at_r260875, and it appears to be quite repeatable _at_r260904. Peace, david -- David H. Wolfskill david_at_catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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