Buildresult: powerpc-next/ppc6xx_defconfig/powerpc-gcc8 built on Jun 19 2019, 02:59

kisskb

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Status:	OK
Date/Time:	Jun 19 2019, 02:59
Duration:	0:04:19.363544
Builder:	ka1
Revision:	powerpc/watchpoint: Restore NV GPRs while returning from exception (`4ea6e7299deb821cd410d8efb8ad86de9f867251)`
Target:	powerpc-next/ppc6xx_defconfig/powerpc-gcc8
Branch:	powerpc-next
Compiler:	powerpc-gcc8 (powerpc64-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30)
Config:	ppc6xx_defconfig (download)
Log:	Download original Possible warnings (2) include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized] kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] Full Log # git rev-parse -q --verify 4ea6e7299deb821cd410d8efb8ad86de9f867251^{commit} 4ea6e7299deb821cd410d8efb8ad86de9f867251 already have revision, skipping fetch # git checkout -q -f -B kisskb 4ea6e7299deb821cd410d8efb8ad86de9f867251 # git clean -qxdf # < git log -1 # commit 4ea6e7299deb821cd410d8efb8ad86de9f867251 # Author: Ravi Bangoria <ravi.bangoria@linux.ibm.com> # Date: Thu Jun 13 09:00:14 2019 +0530 # # powerpc/watchpoint: Restore NV GPRs while returning from exception # # powerpc hardware triggers watchpoint before executing the instruction. # To make trigger-after-execute behavior, kernel emulates the # instruction. If the instruction is 'load something into non-volatile # register', exception handler should restore emulated register state # while returning back, otherwise there will be register state # corruption. eg, adding a watchpoint on a list can corrput the list: # # # cat /proc/kallsyms \| grep kthread_create_list # c00000000121c8b8 d kthread_create_list # # Add watchpoint on kthread_create_list->prev: # # # perf record -e mem:0xc00000000121c8c0 # # Run some workload such that new kthread gets invoked. eg, I just # logged out from console: # # list_add corruption. next->prev should be prev (c000000001214e00), \ # but was c00000000121c8b8. (next=c00000000121c8b8). # WARNING: CPU: 59 PID: 309 at lib/list_debug.c:25 __list_add_valid+0xb4/0xc0 # CPU: 59 PID: 309 Comm: kworker/59:0 Kdump: loaded Not tainted 5.1.0-rc7+ #69 # ... # NIP __list_add_valid+0xb4/0xc0 # LR __list_add_valid+0xb0/0xc0 # Call Trace: # __list_add_valid+0xb0/0xc0 (unreliable) # __kthread_create_on_node+0xe0/0x260 # kthread_create_on_node+0x34/0x50 # create_worker+0xe8/0x260 # worker_thread+0x444/0x560 # kthread+0x160/0x1a0 # ret_from_kernel_thread+0x5c/0x70 # # List corruption happened because it uses 'load into non-volatile # register' instruction: # # Snippet from __kthread_create_on_node: # # c000000000136be8: addis r29,r2,-19 # c000000000136bec: ld r29,31424(r29) # if (!__list_add_valid(new, prev, next)) # c000000000136bf0: mr r3,r30 # c000000000136bf4: mr r5,r28 # c000000000136bf8: mr r4,r29 # c000000000136bfc: bl c00000000059a2f8 <__list_add_valid+0x8> # # Register state from WARN_ON(): # # GPR00: c00000000059a3a0 c000007ff23afb50 c000000001344e00 0000000000000075 # GPR04: 0000000000000000 0000000000000000 0000001852af8bc1 0000000000000000 # GPR08: 0000000000000001 0000000000000007 0000000000000006 00000000000004aa # GPR12: 0000000000000000 c000007ffffeb080 c000000000137038 c000005ff62aaa00 # GPR16: 0000000000000000 0000000000000000 c000007fffbe7600 c000007fffbe7370 # GPR20: c000007fffbe7320 c000007fffbe7300 c000000001373a00 0000000000000000 # GPR24: fffffffffffffef7 c00000000012e320 c000007ff23afcb0 c000000000cb8628 # GPR28: c00000000121c8b8 c000000001214e00 c000007fef5b17e8 c000007fef5b17c0 # # Watchpoint hit at 0xc000000000136bec. # # addis r29,r2,-19 # => r29 = 0xc000000001344e00 + (-19 << 16) # => r29 = 0xc000000001214e00 # # ld r29,31424(r29) # => r29 = (0xc000000001214e00 + 31424) # => r29 = (0xc00000000121c8c0) # # 0xc00000000121c8c0 is where we placed a watchpoint and thus this # instruction was emulated by emulate_step. But because handle_dabr_fault # did not restore emulated register state, r29 still contains stale # value in above register state. # # Fixes: 5aae8a5370802 ("powerpc, hw_breakpoints: Implement hw_breakpoints for 64-bit server processors") # Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> # Cc: stable@vger.kernel.org # 2.6.36+ # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 4ea6e7299deb821cd410d8efb8ad86de9f867251 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc6xx_defconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc6xx_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc6xx_defconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- In file included from /kisskb/src/sound/ppc/pmac.h:25, from /kisskb/src/sound/ppc/awacs.c:29: /kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init': /kisskb/src/include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized] return _snd_ctl_add_slave(master, slave, 0); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here struct snd_kcontrol master_vol, speaker_vol; ^~~~~~~~~~~ /kisskb/src/kernel/futex.c: In function 'do_futex': /kisskb/src/kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] return oldval == cmparg; ~~~~~~~^~~~~~~~~ /kisskb/src/kernel/futex.c:1633:6: note: 'oldval' was declared here int oldval, ret; ^~~~~~ INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbab26c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbbb984) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbab26c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:15 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5624042 Bytes = 5492.23 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c00934 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:15 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5622798 Bytes = 5491.01 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:15 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5623873 Bytes = 5492.06 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c00934 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:15 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5623705 Bytes = 5491.90 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:16 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5622285 Bytes = 5490.51 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:16 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5587688 Bytes = 5456.73 KiB = 5.33 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:16 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5622952 Bytes = 5491.16 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:17 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5623259 Bytes = 5491.46 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Image Name: Linux-5.2.0-rc2+ Created: Wed Jun 19 03:03:17 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5623219 Bytes = 5491.42 KiB = 5.36 MiB Load Address: 00c00000 Entry Point: 00c002a4 Completed OK # rm -rf /kisskb/build/powerpc-next_ppc6xx_defconfig_powerpc-gcc8 # Build took: 0:04:19.363544

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