* Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' @ 2017-02-27 20:59 Guenter Roeck 2017-02-27 22:21 ` Josh Poimboeuf 0 siblings, 1 reply; 6+ messages in thread From: Guenter Roeck @ 2017-02-27 20:59 UTC (permalink / raw) To: Josh Poimboeuf; +Cc: Peter Zijlstra, Ingo Molnar, linux-kernel Hi, my qemu tests for mips64 in -next fail as follows. ... VFS: Mounted root (ext3 filesystem) on device 8:0. Freeing unused kernel memory: 304K This architecture does not have kernel memory protection. Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a There is no symbol traceback, and I don't see any other (obvious) error message. bisect points to commit 'objtool: Improve detection of BUG() and other dead ends'; reverting that patch fixes the problem. Bisect log is attached below. The script used to run the test as well as the root file system is available at https://github.com/groeck/linux-build-test/tree/master/rootfs/mips64 A complete log is available at http://kerneltests.org/builders/qemu-mips64-next/builds/592/steps/qemubuildcommand/logs/stdio Guenter --- # bad: [ed7b11e565c736828f0b793f596a4ca20efee747] Add linux-next specific files for 20170227 # good: [c470abd4fde40ea6a0846a2beab642a578c0b8cd] Linux 4.10 git bisect start 'HEAD' 'v4.10' # good: [caa59428971d5ad81d19512365c9ba580d83268c] Merge tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging git bisect good caa59428971d5ad81d19512365c9ba580d83268c # good: [d5500a074741b78b7f778b4ab3415d5ecdcda0a7] Merge tag 'usercopy-v4.11-rc1.fix' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux git bisect good d5500a074741b78b7f778b4ab3415d5ecdcda0a7 # good: [5d8a00eee2ed2e548a5d21b0edf495f3f7bf8bb4] Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux git bisect good 5d8a00eee2ed2e548a5d21b0edf495f3f7bf8bb4 # good: [017bfb6c372fa793cdb09828597a464fa24e0ea7] Merge remote-tracking branch 'jfs/jfs-next' git bisect good 017bfb6c372fa793cdb09828597a464fa24e0ea7 # bad: [e2a95a3fe9e9586df29e8d673dc8cdd36ed6158b] Merge remote-tracking branch 'edac/linux_next' git bisect bad e2a95a3fe9e9586df29e8d673dc8cdd36ed6158b # good: [736e441efdafdbf0bb32732d87e00b8ba7f75260] Merge remote-tracking branch 'thermal/next' git bisect good 736e441efdafdbf0bb32732d87e00b8ba7f75260 # good: [5bd695c24b294b482d86d352a4a0c7ba2059dcff] Merge remote-tracking branch 'block/for-next' git bisect good 5bd695c24b294b482d86d352a4a0c7ba2059dcff # good: [690962e72babac64c8240071e106d2c3e8d08306] Merge remote-tracking branch 'spi/for-next' git bisect good 690962e72babac64c8240071e106d2c3e8d08306 # bad: [462a53b1a2f984a8c8c0aade1c461ce9ea156d5b] Merge branch 'perf/urgent' git bisect bad 462a53b1a2f984a8c8c0aade1c461ce9ea156d5b # good: [bb963e16507ca7670f0bb47ccaada8874b2ba6a1] perf utils: Check verbose flag properly git bisect good bb963e16507ca7670f0bb47ccaada8874b2ba6a1 # good: [7bbba0eb1af34694868d028b80475981f90e6bee] perf/core: Fix perf_event_enable_on_exec() timekeeping (again) git bisect good 7bbba0eb1af34694868d028b80475981f90e6bee # bad: [1db159781cc7df093085ccaddc022beaaa9dd990] Merge branch 'core/urgent' git bisect bad 1db159781cc7df093085ccaddc022beaaa9dd990 # bad: [d1091c7fa3d52ebce4dd3f15d04155b3469b2f90] objtool: Improve detection of BUG() and other dead ends git bisect bad d1091c7fa3d52ebce4dd3f15d04155b3469b2f90 # good: [9f0c18aec620bc9d82268b3cb937568dd07b43ff] objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree modules git bisect good 9f0c18aec620bc9d82268b3cb937568dd07b43ff # first bad commit: [d1091c7fa3d52ebce4dd3f15d04155b3469b2f90] objtool: Improve detection of BUG() and other dead ends ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' 2017-02-27 20:59 Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' Guenter Roeck @ 2017-02-27 22:21 ` Josh Poimboeuf 2017-02-27 23:23 ` Guenter Roeck 0 siblings, 1 reply; 6+ messages in thread From: Josh Poimboeuf @ 2017-02-27 22:21 UTC (permalink / raw) To: Guenter Roeck; +Cc: Peter Zijlstra, Ingo Molnar, linux-kernel On Mon, Feb 27, 2017 at 12:59:23PM -0800, Guenter Roeck wrote: > Hi, > > my qemu tests for mips64 in -next fail as follows. > > ... > VFS: Mounted root (ext3 filesystem) on device 8:0. > Freeing unused kernel memory: 304K > This architecture does not have kernel memory protection. > Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > There is no symbol traceback, and I don't see any other (obvious) error > message. bisect points to commit 'objtool: Improve detection of BUG() > and other dead ends'; reverting that patch fixes the problem. > Bisect log is attached below. > > The script used to run the test as well as the root file system is available > at https://github.com/groeck/linux-build-test/tree/master/rootfs/mips64 > > A complete log is available at > http://kerneltests.org/builders/qemu-mips64-next/builds/592/steps/qemubuildcommand/logs/stdio Hi Guenter, This failure doesn't make much sense. Objtool (and the reported bad patch) are x86-only and should have nothing to do with mips64. Would it be possible for you to double check the error? Otherwise I could try to recreate. Do you have a recommendation for a mips cross-compiler? (preferably something that's already built and that might work on Fedora) > --- > # bad: [ed7b11e565c736828f0b793f596a4ca20efee747] Add linux-next specific files for 20170227 > # good: [c470abd4fde40ea6a0846a2beab642a578c0b8cd] Linux 4.10 > git bisect start 'HEAD' 'v4.10' > # good: [caa59428971d5ad81d19512365c9ba580d83268c] Merge tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging > git bisect good caa59428971d5ad81d19512365c9ba580d83268c > # good: [d5500a074741b78b7f778b4ab3415d5ecdcda0a7] Merge tag 'usercopy-v4.11-rc1.fix' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux > git bisect good d5500a074741b78b7f778b4ab3415d5ecdcda0a7 > # good: [5d8a00eee2ed2e548a5d21b0edf495f3f7bf8bb4] Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux > git bisect good 5d8a00eee2ed2e548a5d21b0edf495f3f7bf8bb4 > # good: [017bfb6c372fa793cdb09828597a464fa24e0ea7] Merge remote-tracking branch 'jfs/jfs-next' > git bisect good 017bfb6c372fa793cdb09828597a464fa24e0ea7 > # bad: [e2a95a3fe9e9586df29e8d673dc8cdd36ed6158b] Merge remote-tracking branch 'edac/linux_next' > git bisect bad e2a95a3fe9e9586df29e8d673dc8cdd36ed6158b > # good: [736e441efdafdbf0bb32732d87e00b8ba7f75260] Merge remote-tracking branch 'thermal/next' > git bisect good 736e441efdafdbf0bb32732d87e00b8ba7f75260 > # good: [5bd695c24b294b482d86d352a4a0c7ba2059dcff] Merge remote-tracking branch 'block/for-next' > git bisect good 5bd695c24b294b482d86d352a4a0c7ba2059dcff > # good: [690962e72babac64c8240071e106d2c3e8d08306] Merge remote-tracking branch 'spi/for-next' > git bisect good 690962e72babac64c8240071e106d2c3e8d08306 > # bad: [462a53b1a2f984a8c8c0aade1c461ce9ea156d5b] Merge branch 'perf/urgent' > git bisect bad 462a53b1a2f984a8c8c0aade1c461ce9ea156d5b > # good: [bb963e16507ca7670f0bb47ccaada8874b2ba6a1] perf utils: Check verbose flag properly > git bisect good bb963e16507ca7670f0bb47ccaada8874b2ba6a1 > # good: [7bbba0eb1af34694868d028b80475981f90e6bee] perf/core: Fix perf_event_enable_on_exec() timekeeping (again) > git bisect good 7bbba0eb1af34694868d028b80475981f90e6bee > # bad: [1db159781cc7df093085ccaddc022beaaa9dd990] Merge branch 'core/urgent' > git bisect bad 1db159781cc7df093085ccaddc022beaaa9dd990 > # bad: [d1091c7fa3d52ebce4dd3f15d04155b3469b2f90] objtool: Improve detection of BUG() and other dead ends > git bisect bad d1091c7fa3d52ebce4dd3f15d04155b3469b2f90 > # good: [9f0c18aec620bc9d82268b3cb937568dd07b43ff] objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree modules > git bisect good 9f0c18aec620bc9d82268b3cb937568dd07b43ff > # first bad commit: [d1091c7fa3d52ebce4dd3f15d04155b3469b2f90] objtool: Improve detection of BUG() and other dead ends -- Josh ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' 2017-02-27 22:21 ` Josh Poimboeuf @ 2017-02-27 23:23 ` Guenter Roeck 2017-02-28 0:43 ` Josh Poimboeuf 0 siblings, 1 reply; 6+ messages in thread From: Guenter Roeck @ 2017-02-27 23:23 UTC (permalink / raw) To: Josh Poimboeuf; +Cc: Peter Zijlstra, Ingo Molnar, linux-kernel Hi Josh, On Mon, Feb 27, 2017 at 04:21:14PM -0600, Josh Poimboeuf wrote: > On Mon, Feb 27, 2017 at 12:59:23PM -0800, Guenter Roeck wrote: > > Hi, > > > > my qemu tests for mips64 in -next fail as follows. > > > > ... > > VFS: Mounted root (ext3 filesystem) on device 8:0. > > Freeing unused kernel memory: 304K > > This architecture does not have kernel memory protection. > > Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > > > ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > > > There is no symbol traceback, and I don't see any other (obvious) error > > message. bisect points to commit 'objtool: Improve detection of BUG() > > and other dead ends'; reverting that patch fixes the problem. > > Bisect log is attached below. > > > > The script used to run the test as well as the root file system is available > > at https://github.com/groeck/linux-build-test/tree/master/rootfs/mips64 > > > > A complete log is available at > > http://kerneltests.org/builders/qemu-mips64-next/builds/592/steps/qemubuildcommand/logs/stdio > > Hi Guenter, > > This failure doesn't make much sense. Objtool (and the reported bad > patch) are x86-only and should have nothing to do with mips64. Would it > be possible for you to double check the error? > I already did; after all, bisect points to the patch, and reverting it fixes the problem. After looking into the patch, I concluded that the following might help. -#define unreachable() annotate_unreachable(); __builtin_unreachable() +#define unreachable() do { annotate_unreachable(); __builtin_unreachable(); } while (0) and it does ... > Otherwise I could try to recreate. Do you have a recommendation for a > mips cross-compiler? (preferably something that's already built and that > might work on Fedora) > I use gcc 4.9.0 from https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.9.0/ Guenter ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' 2017-02-27 23:23 ` Guenter Roeck @ 2017-02-28 0:43 ` Josh Poimboeuf 2017-02-28 4:21 ` [PATCH] objtool: enclose contents of unreachable() macro in a block Josh Poimboeuf 0 siblings, 1 reply; 6+ messages in thread From: Josh Poimboeuf @ 2017-02-28 0:43 UTC (permalink / raw) To: Guenter Roeck; +Cc: Peter Zijlstra, Ingo Molnar, linux-kernel On Mon, Feb 27, 2017 at 03:23:28PM -0800, Guenter Roeck wrote: > Hi Josh, > > On Mon, Feb 27, 2017 at 04:21:14PM -0600, Josh Poimboeuf wrote: > > On Mon, Feb 27, 2017 at 12:59:23PM -0800, Guenter Roeck wrote: > > > Hi, > > > > > > my qemu tests for mips64 in -next fail as follows. > > > > > > ... > > > VFS: Mounted root (ext3 filesystem) on device 8:0. > > > Freeing unused kernel memory: 304K > > > This architecture does not have kernel memory protection. > > > Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > > > > > ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a > > > > > > There is no symbol traceback, and I don't see any other (obvious) error > > > message. bisect points to commit 'objtool: Improve detection of BUG() > > > and other dead ends'; reverting that patch fixes the problem. > > > Bisect log is attached below. > > > > > > The script used to run the test as well as the root file system is available > > > at https://github.com/groeck/linux-build-test/tree/master/rootfs/mips64 > > > > > > A complete log is available at > > > http://kerneltests.org/builders/qemu-mips64-next/builds/592/steps/qemubuildcommand/logs/stdio > > > > Hi Guenter, > > > > This failure doesn't make much sense. Objtool (and the reported bad > > patch) are x86-only and should have nothing to do with mips64. Would it > > be possible for you to double check the error? > > > I already did; after all, bisect points to the patch, and reverting it fixes > the problem. After looking into the patch, I concluded that the following > might help. > > -#define unreachable() annotate_unreachable(); __builtin_unreachable() > +#define unreachable() do { annotate_unreachable(); __builtin_unreachable(); } while (0) > > and it does ... > Doh, of course. Thanks for pointing it out, I'll fix it. -- Josh ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] objtool: enclose contents of unreachable() macro in a block 2017-02-28 0:43 ` Josh Poimboeuf @ 2017-02-28 4:21 ` Josh Poimboeuf 2017-02-28 6:49 ` [tip:core/urgent] objtool: Enclose " tip-bot for Josh Poimboeuf 0 siblings, 1 reply; 6+ messages in thread From: Josh Poimboeuf @ 2017-02-28 4:21 UTC (permalink / raw) To: Guenter Roeck; +Cc: Peter Zijlstra, Ingo Molnar, linux-kernel Guenter Roeck reported a boot failure in mips64. It was bisected to the following commit: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends") The unreachable() macro was formerly only composed of a single statement. The above commit added a second statement, but neglected to enclose the statements in a block. Reported-by: Guenter Roeck <linux@roeck-us.net> Suggested-by: Guenter Roeck <linux@roeck-us.net> Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends") Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- include/linux/compiler-gcc.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index de47134..f457b520 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -215,7 +215,8 @@ * this in the preprocessor, but we can live with this because they're * unreleased. Really, we need to have autoconf for the kernel. */ -#define unreachable() annotate_unreachable(); __builtin_unreachable() +#define unreachable() \ + do { annotate_unreachable(); __builtin_unreachable(); } while (0) /* Mark a function definition as prohibited from being cloned. */ #define __noclone __attribute__((__noclone__, __optimize__("no-tracer"))) -- 2.7.4 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [tip:core/urgent] objtool: Enclose contents of unreachable() macro in a block 2017-02-28 4:21 ` [PATCH] objtool: enclose contents of unreachable() macro in a block Josh Poimboeuf @ 2017-02-28 6:49 ` tip-bot for Josh Poimboeuf 0 siblings, 0 replies; 6+ messages in thread From: tip-bot for Josh Poimboeuf @ 2017-02-28 6:49 UTC (permalink / raw) To: linux-tip-commits Cc: jpoimboe, hpa, mingo, tglx, peterz, linux, torvalds, linux-kernel Commit-ID: 4e4636cf981b5b629fbfb78aa9f232e015f7d521 Gitweb: http://git.kernel.org/tip/4e4636cf981b5b629fbfb78aa9f232e015f7d521 Author: Josh Poimboeuf <jpoimboe@redhat.com> AuthorDate: Mon, 27 Feb 2017 22:21:16 -0600 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 28 Feb 2017 07:47:26 +0100 objtool: Enclose contents of unreachable() macro in a block Guenter Roeck reported a boot failure in mips64. It was bisected to the following commit: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends") The unreachable() macro was formerly only composed of a single statement. The above commit added a second statement, but neglected to enclose the statements in a block. Suggested-by: Guenter Roeck <linux@roeck-us.net> Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends") Link: http://lkml.kernel.org/r/20170228042116.glmwmwiohcix7o4a@treble Signed-off-by: Ingo Molnar <mingo@kernel.org> --- include/linux/compiler-gcc.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index de47134..f457b52 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -215,7 +215,8 @@ * this in the preprocessor, but we can live with this because they're * unreleased. Really, we need to have autoconf for the kernel. */ -#define unreachable() annotate_unreachable(); __builtin_unreachable() +#define unreachable() \ + do { annotate_unreachable(); __builtin_unreachable(); } while (0) /* Mark a function definition as prohibited from being cloned. */ #define __noclone __attribute__((__noclone__, __optimize__("no-tracer"))) ^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-02-28 10:45 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2017-02-27 20:59 Crash in -next due to 'objtool: Improve detection of BUG() and other dead ends' Guenter Roeck 2017-02-27 22:21 ` Josh Poimboeuf 2017-02-27 23:23 ` Guenter Roeck 2017-02-28 0:43 ` Josh Poimboeuf 2017-02-28 4:21 ` [PATCH] objtool: enclose contents of unreachable() macro in a block Josh Poimboeuf 2017-02-28 6:49 ` [tip:core/urgent] objtool: Enclose " tip-bot for Josh Poimboeuf
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