Date: Wed, 23 Mar 2005 15:46:40 -0500 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-current@FreeBSD.org Cc: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> Subject: Re: sys/modules/linux/linux_ioctl.o - LOR [I think] Message-ID: <200503231546.40408.jhb@FreeBSD.org> In-Reply-To: <20050302020453.GE55745@squash.dsto.defence.gov.au> References: <20050302020453.GE55745@squash.dsto.defence.gov.au>
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On Tuesday 01 March 2005 09:04 pm, Wilkinson, Alex wrote: > Version: FreeBSD 6.0-CURRENT #1: Tue Feb 22 12:47:37 CST 2005 > > Seeing these error on console: > > --- syscall (54, Linux ELF, linux_ioctl), eip = 0x283bf2a4, esp = > 0xbfbf8ed0, ebp = 0xbfbf8f80 --- Calling uiomove() with the following > non-sleepable locks held: > exclusive sleep mutex ifnet r = 0 (0xc09b8ea0) locked @ > /usr/src/sys/modules/linux/../../compat/linux/linux_ioctl.c:2135 KDB: stack > backtrace: > witness_warn(2,0,c08a71b8,ec80fbec,0) at witness_warn+0x175 > uiomove(ec80fc64,20,ec80fc44,0,1) at uiomove+0x4d > linux_ioctl_socket(c6b52000,ec80fd14,ec80fcd0,c08aa46e,68d) at > linux_ioctl_socket+0x8f4 linux_ioctl(c6b52000,ec80fd14,c08c8f72,3ad,3) at > linux_ioctl+0x69 syscall(2f,2f,2f,bfbfd36c,4) at syscall+0x13b > Xint0x80_syscall() at Xint0x80_syscall+0x1f > --- syscall (54, Linux ELF, linux_ioctl), eip = 0x283bf2a4, esp = > 0xbfbfd290, ebp = 0xbfbfd300 --- Calling uiomove() with the following > non-sleepable locks held: > exclusive sleep mutex ifnet r = 0 (0xc09b8ea0) locked @ > /usr/src/sys/modules/linux/../../compat/linux/linux_ioctl.c:2135 KDB: stack > backtrace: > witness_warn(2,0,c08a71b8,0,0) at witness_warn+0x175 > uiomove(ec80fc64,20,ec80fc44,0,1) at uiomove+0x4d > linux_ioctl_socket(c6b52000,ec80fd14,ec80fcd0,c08aa46e,68d) at > linux_ioctl_socket+0x8f4 > linux_ioctl(c6b52000,ec80fd14,c08c8f72,3ad,3) at linux_ioctl+0x69 > syscall(2f,2f,2f,bfbfd36c,4) at syscall+0x13b > Xint0x80_syscall() at Xint0x80_syscall+0x1f > --- syscall (54, Linux ELF, linux_ioctl), eip = 0x283bf2a4, esp = > 0xbfbfd290, ebp = 0xbfbfd300 --- Definitely a bug. The linux_ioctl() code needs to unlock the ifnet lock before it calls uiomove() unless it knows for certain that it is talking to UIO_SYSSPACE. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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