Date: Tue, 29 Nov 2005 12:08:56 -0800 From: Mark Atkinson <atkin901@yahoo.com> To: freebsd-current@freebsd.org Subject: LOR: so_snd @ /usr/src/sys/kern/uipc_coket.c:780 Message-ID: <dmicgn$9fs$1@sea.gmane.org>
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this one seems new, and doesn't seem to match anything on the known list. Typed by hand. Single processor, no hyperthreading. The last thing it was doing was doing a 'test' command on a file over nfs. Lock order reversal: 1st 0xc5ef0ec so_snd (so_snd) @ /usr/src/sys/kern/uipc_socket.c:780 2nd 0xc0ac15ec tcp (tcp) @ /usr/src/sys/netinet/tcp_usrreq.c:580 KDB: stack backstrace: kdb_backtrace() at kdb_backtrace+0x2e witness_checkorder() at witness_checkorder+0x6d3 _mtx_lock_flags() at _mtx_lock_flags+0x8a tcp_usr_shutdown() at tcp_usr_shutdown+0x3d soshutdown() at soshutdown+0x41 nfs_disconnect() at nfs_disconnect+0xd5 nfs_reconnect() at nfs_reconnect+0x1c nfs_reply() at nfs_reply+0x170 nfs_request() at nfs_request+0x451 nfs3_access_otw() at nfs3_access_otw+0xde nfs_access() at nfs_access+0x120 VOP_ACCESS_APV() at VOP_ACCESS_APV+0xac nfs_lookup() at nfs_lookup+0xe5 VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xb4 lookup() at lookup+0x468 namei() at namei+0x468 kern_stat() at kern_stat+0x3d stat() at stat+0x2f syscall() at Xint0x80_syscall+0x1f --- syscall (188, FreeBSD ELF32, stat, eip = 0x2819ad63, esp = 0xbfbfe8cc, ebp = 0xbfbfe9c8 --- panic: _mtx_lock_sleep: recursed on non-recursive mutex so_snd @ /usr/src/sys/kern/uipc_socket.c:391 cpuid = 0 KDB: enter: panic Stopped at kdb_enter+0x30: leave db> db> show alllocks Process 54517 (sh) thread 0xc5f1fd80 (100100) exclusive sleep mutex so_snd r = 0 (0xc5aef0ec) locked @ /usr/src/sys/kern/uipc_socket.c:780 exclusive sleep mutex Giant r = 0 (0xc0a713c0) locked @ /usr/src/sys/kern/vfs_lookup.c:619 Process 54515 (cc1) thread 0xc5eac600 (100093) exclusive sx user map r = 0 (0xc5fa2170) locked @ /usr/src/sys/vm/vm_map:2996
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