Date: Sat, 8 May 2010 12:17:24 +0200 From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net> To: current@freebsd.org Subject: LOR: acpi_dock vs sysctl Message-ID: <20100508101724.GA1867@elmar.spoerlein.net>
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Hi, just turned on WITNESS as my laptop freezes from time to time and among the many LORs, here's a new one: lock order reversal: 1st 0xc09f3484 sysctl lock (sysctl lock) @ /usr/src/sys/kern/kern_sysctl.c:1521 2nd 0xc0eed504 ACPI Docking Station (ACPI Docking Station) @ /usr/src/sys/modules/acpi/acpi_dock/../../../dev/acpica/acpi_dock.c:423 KDB: stack backtrace: db_trace_self_wrapper(c09394fe,fb807aac,c062e515,c061e8ab,c093c4d8,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c061e8ab,c093c4d8,c4188da8,c418ae28,fb807b08,...) at kdb_backtrace+0x29 _witness_debugger(c093c4d8,c0eed504,c0eec1cb,c418ae28,c0eec15e,...) at _witness_debugger+0x25 witness_checkorder(c0eed504,9,c0eec15e,1a7,0,...) at witness_checkorder+0x839 _sx_xlock(c0eed504,0,c0eec15e,1a7,0,...) at _sx_xlock+0x85 acpi_dock_status_sysctl(c44c20c0,c42d0e80,0,fb807ba4,fb807ba4,...) at acpi_dock_status_sysctl+0x49 sysctl_root(fb807ba4,0,c0936c1e,5f1,c47bb000,...) at sysctl_root+0x187 userland_sysctl(c47bb000,fb807c10,4,0,bfbfdc40,...) at userland_sysctl+0x17c __sysctl(c47bb000,fb807cf8,c0972725,c093d30d,c47ead48,...) at __sysctl+0x94 syscall(fb807d38) at syscall+0x220 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (202, FreeBSD ELF32, __sysctl), eip = 0x2818cc1b, esp = 0xbfbfdb4c, ebp = 0xbfbfdb78 --- btw, my laptop freezes sometimes when docking/undocking, not sure if this is related then.
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