Date: Tue, 27 Oct 2009 20:25:35 -0400 (EDT) From: Benjamin Kaduk <kaduk@MIT.EDU> To: tuezen@freebsd.org, freebsd-current@freebsd.org Cc: bzeeb+freebsd+lor@zabbadoz.net Subject: lock order reversal on startup (rtentry, ifnet_sx) Message-ID: <alpine.GSO.1.10.0910272007430.22378@multics.mit.edu>
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Hi all, I don't see this explicitly mentioned before, nor on http://sources.zabbadoz.net/freebsd/lor.html It shows up on startup with a -current from two days ago. Looking at the svn logs, maybe it was introduced with r197328? lock order reversal: (sleepable after non-sleepable) 1st 0xffffff0002d360a8 rtentry (rtentry) @ /usr/src/sys/net/route.c:1474 2nd 0xffffffff80e00b00 ifnet_sx (ifnet_sx) @ /usr/src/sys/netinet/sctp_bsd_addr.c:212 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at _witness_debugger+0x2e witness_checkorder() at witness_checkorder+0x81e _sx_slock() at _sx_slock+0x55 sctp_init_ifns_for_vrf() at sctp_init_ifns_for_vrf+0x2e sctp_addr_change() at sctp_addr_change+0xce rt_newaddrmsg() at rt_newaddrmsg+0x54 rtinit() at rtinit+0x358 in_ifinit() at in_ifinit+0x2fd in_control() at in_control+0x1047 ifioctl() at ifioctl+0xfc1 kern_ioctl() at kern_ioctl+0xc5 ioctl() at ioctl+0xfd syscall() at syscall+0x1af Xfast_syscall() at Xfast_syscall+0xe1 --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x800b8072c, rsp = 0x7fffffffe4e8, rbp = 0x7fffffffef6a --- -Ben Kaduk
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