Date: Fri, 15 Jun 2007 23:42:59 +0100 From: "Alex Burke" <alexjeffburke@gmail.com> To: "FreeBSD CURRENT" <freebsd-current@freebsd.org> Subject: Access to tape drive caused following backtrace Message-ID: <a8b8bb510706151542t2715c34bn680315875d0cacb5@mail.gmail.com>
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Hi, I was just doung a tar -tf /dev/sa0 when I got (hand transcribed): uma_zalloc_arg: zone "32" with the following non-sleepable locks held: exclusive sleep mutex ahc_lock r = 0 (0xc3cb2eb0) locked @ /usr/src/sys/cam/cam_ periph.h:182 KDB: stack backtrace: db_trace_self_wrapper(c01afca0,df502850,c076fcfd,c0a20063,df502864,...) at db_tr ace_self_wrapper+0x26 kdb_backtrace(c0a20063,df502864,4,1,0,...) at kdb_backtrace+0x29 witness_warn(5,0,c0a3a76f,c0a408e1,c3b76000,...) at witness_warn+0x41cd uma_zalloc_arg(c1472b40,0,102,2,c3ef6400,...) at uma_zalloc_arg+0x34 malloc(1c,c0a564e0,102,df502900,c09d8343,...) at malloc+0xd2 sagetparams(c3ef6484,c3ef6480,c3ef6488,df50299f,c3ef6485,...) at sagetparams+0x4 2c samount(c3e81a80,14c,c09d88343,b6,6,...) at samount+0x6df saopen(c3de8900,1,2000,c4080600,c0a56760,...) at sa_open+0x124 giant_open(c3de8900,1,2000,c4080600,c3f08200,...) at giant_open+0x4f devfs_open(df502a8c,c4080600,df502b80,df502b1c,...) at devfs_open+0x230 VOP_OPEN_APV(c0ac19e0,df502a8c,df502a78,246,c424a000,...) at VOP_OPEN_APV+0xa5 vn_open_cred(df502b80,df502c78,0,c4233180,c4064e58,...) at vn_open_cred+0x44b vn_open(df502b80,df502c78,0,c4064e58,246,...) at vn_open+0x33 kern_open(c4080600,df502cfc,c,c,c0ac4918,...) at kern_open+0xc3 open(c4080600,df502cfc,c,c,c0ac4918,...) at open+0x30 syscall(df502d38) at syscall+0x288 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (5, FreeBSD ELF32, open), eip = 0x28194a7b, esp = 0xbfbfe9fc, ebp = 0xbfbfea88 --- The machine did not panic, seemed to still be responsive. Maybe the problem has been fixed since the CURRENT I am running, but I thought I should post this anyway. Cheers, Alex J Burke.
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