Re: PR/49862 CVS commit: src/sys/external/bsd/drm2/ttm

[Thomas Klausner <wiz%NetBSD.org@localhost>]

The following reply was made to PR kern/49862; it has been noted by GNATS.

From: Thomas Klausner <wiz%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: PR/49862 CVS commit: src/sys/external/bsd/drm2/ttm
Date: Tue, 28 Jul 2015 02:04:09 +0200

 On Mon, Jul 27, 2015 at 10:30:01PM +0000, Taylor R Campbell wrote:
 > The following reply was made to PR kern/49862; it has been noted by GNATS.
 > 
 > From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
 > To: gnats-bugs%gnats.NetBSD.org@localhost
 > Cc: 
 > Subject: PR/49862 CVS commit: src/sys/external/bsd/drm2/ttm
 > Date: Mon, 27 Jul 2015 22:26:51 +0000
 > 
 >  Module Name:	src
 >  Committed By:	riastradh
 >  Date:		Mon Jul 27 22:26:51 UTC 2015
 >  
 >  Modified Files:
 >  	src/sys/external/bsd/drm2/ttm: ttm_bo_vm.c
 >  
 >  Log Message:
 >  Fix error branch: ttm_bo_unreserve on failure after ttm_bo_reserve.
 >  
 >  Tiny chance this will fix PR kern/49862 by not leaking a ww_mutex
 >  lock.
 
 I've just retried my simple:
 
 libreoffice *.doc
 
 test (in a directory with about 20 doc files) and paniced.
  SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  radeon_ttm_fault() at WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 122 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  netbsd:radeon_ttm_fault+0x6a
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 129 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  uvm_WfAaRuNlItN_Gi:n tSePrLn aNlO(T)  LaOtW ERED ON SYSCALL 101 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 123 4 EXIT 1 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  netbsd:uvm_fault_internal+0x828
  WARNING: SPL NOT LOWERED ON SYSCALL 132 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  trap() at WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 110 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  netbsd:trap+0x346
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  --- trap (number 6) ---
  WARNING: SPL NOT LOWERED ON SYSCALL 142 4 EXIT 0 6
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  WARNING: SPL NOT LOWERED ON SYSCALL 100 4 EXIT 0 6
  7f7fefe2563d:
  WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT 0 7
  cpu5: End traceback...
  WARNING: SPL NOT LOWERED ON SYSCALL 137 4 EXIT 0 6
 
 savecore: reboot after panic: panic: kernel diagnostic assertion "((mutex->wwm_state != WW_OWNED) || (mutex->wwm_u.owner != curlwp))" failed: file "/archive/foreign/src/sys/external/bsd/drm2/linux/linux_ww_mutex.c", line 760 locking 0xfffffe87Wf6ce7aA2R0N IaNgGa:i nSsPtL myself: 0xfffffe881ef51060
  NOT LOWERED ON SYSCALL 207 4 EXIT 0 6
  savecore: system went down at Tue Jul 28 01:56:40 2015
 
 savecore: writing compressed core to /var/crash/netbsd.80.core.gz
 
 Core and netbsd.gdb file (/netbsd.7.99.20c.gdb) available on request.
  Thomas