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Message-ID: <5c6b1286-7035-98a2-456b-735fb5d27e6c@joelfernandes.org>
Date: Sat, 3 Sep 2022 10:07:51 -0400
From: Joel Fernandes <joel@...lfernandes.org>
To: paulmck@...nel.org, kernel test robot <lkp@...el.com>
Cc: rcu@...r.kernel.org, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org, rushikesh.s.kadam@...el.com,
urezki@...il.com, neeraj.iitr10@...il.com, frederic@...nel.org,
rostedt@...dmis.org, vineeth@...byteword.org, boqun.feng@...il.com
Subject: Re: [PATCH v5 08/18] rcu: Add per-CB tracing for queuing, flush and
invocation.
On 9/3/2022 8:39 AM, Paul E. McKenney wrote:
> On Sat, Sep 03, 2022 at 12:48:28AM +0800, kernel test robot wrote:
>> Hi "Joel,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on paulmck-rcu/dev]
>> [also build test ERROR on pcmoore-selinux/next drm-intel/for-linux-next linus/master v6.0-rc3]
>> [cannot apply to vbabka-slab/for-next rostedt-trace/for-next tip/timers/core next-20220901]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>
>> url: https://github.com/intel-lab-lkp/linux/commits/Joel-Fernandes-Google/Implement-call_rcu_lazy-and-miscellaneous-fixes/20220902-062156
>> base: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
>> config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20220903/202209030052.20CJhjTX-lkp@intel.com/config)
>> compiler: mips-linux-gcc (GCC) 12.1.0
>> reproduce (this is a W=1 build):
>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>> chmod +x ~/bin/make.cross
>> # https://github.com/intel-lab-lkp/linux/commit/c0f09b1d42d06649680f74a78ca363e7f1c158b2
>> git remote add linux-review https://github.com/intel-lab-lkp/linux
>> git fetch --no-tags linux-review Joel-Fernandes-Google/Implement-call_rcu_lazy-and-miscellaneous-fixes/20220902-062156
>> git checkout c0f09b1d42d06649680f74a78ca363e7f1c158b2
>> # save the config file
>> mkdir build_dir && cp config build_dir/.config
>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag where applicable
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>> In file included from <command-line>:
>> In function 'dst_hold',
>> inlined from 'dst_clone' at include/net/dst.h:251:3,
>> inlined from '__skb_dst_copy' at include/net/dst.h:284:3,
>> inlined from 'ovs_vport_output' at net/openvswitch/actions.c:787:2:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>
> This looks like fallout from the rcu_head structure changing size,
> given that __refcnt comes after rcu_head on 32-bit systems.
>
Yes, I also thought of that as the likely cause.
> It looks like the per-CB tracing code needs to be kept on the side for
> the time being rather than being sent to -next (let alone mainline).
True, that should be Ok. It is a debug patch and can make it a bit later.
> Any reason I cannot just move this one to the end of the stack, after
> "fork: Move thread_stack_free_rcu() to call_rcu_lazy()"?
No reason, it is an independent patch.
- Joel
>
> Thanx, Paul
>
>> In function 'dst_hold',
>> inlined from 'execute_set_action' at net/openvswitch/actions.c:1093:3,
>> inlined from 'do_execute_actions' at net/openvswitch/actions.c:1377:10:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> --
>> In file included from <command-line>:
>> In function 'dst_hold',
>> inlined from 'dst_hold_and_use' at include/net/dst.h:244:2,
>> inlined from 'dn_insert_route.constprop.isra' at net/decnet/dn_route.c:334:4:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'dst_hold_and_use' at include/net/dst.h:244:2,
>> inlined from 'dn_insert_route.constprop.isra' at net/decnet/dn_route.c:347:2:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'dst_hold_and_use' at include/net/dst.h:244:2,
>> inlined from 'dn_route_input' at net/decnet/dn_route.c:1535:4:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'dst_hold_and_use' at include/net/dst.h:244:2,
>> inlined from '__dn_route_output_key.isra' at net/decnet/dn_route.c:1257:5:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'dst_clone' at include/net/dst.h:251:3,
>> inlined from 'dn_cache_dump' at net/decnet/dn_route.c:1752:4:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> --
>> In file included from <command-line>:
>> In function 'dst_hold',
>> inlined from 'dst_clone' at include/net/dst.h:251:3,
>> inlined from 'ip6_copy_metadata' at net/ipv6/ip6_output.c:654:2:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'ip6_append_data' at net/ipv6/ip6_output.c:1838:3:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> In function 'dst_hold',
>> inlined from 'dst_clone' at include/net/dst.h:251:3,
>> inlined from 'ip6_sk_dst_lookup_flow' at net/ipv6/ip6_output.c:1262:3:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>> --
>> In file included from <command-line>:
>> In function 'dst_hold',
>> inlined from 'dst_clone' at include/net/dst.h:251:3,
>> inlined from '__skb_dst_copy' at include/net/dst.h:284:3,
>> inlined from 'skb_dst_copy' at include/net/dst.h:289:2,
>> inlined from 'ip6_list_rcv_finish.constprop' at net/ipv6/ip6_input.c:128:4:
>>>> include/linux/compiler_types.h:354:45: error: call to '__compiletime_assert_490' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^
>> include/linux/compiler_types.h:335:25: note: in definition of macro '__compiletime_assert'
>> 335 | prefix ## suffix(); \
>> | ^~~~~~
>> include/linux/compiler_types.h:354:9: note: in expansion of macro '_compiletime_assert'
>> 354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> | ^~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>> | ^~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>> | ^~~~~~~~~~~~~~~~
>> include/net/dst.h:230:9: note: in expansion of macro 'BUILD_BUG_ON'
>> 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
>> | ^~~~~~~~~~~~
>>
>>
>> vim +/__compiletime_assert_490 +354 include/linux/compiler_types.h
>>
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 340
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 341 #define _compiletime_assert(condition, msg, prefix, suffix) \
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 342 __compiletime_assert(condition, msg, prefix, suffix)
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 343
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 344 /**
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 345 * compiletime_assert - break build and emit msg if condition is false
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 346 * @condition: a compile-time constant condition to check
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 347 * @msg: a message to emit if condition is false
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 348 *
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 349 * In tradition of POSIX assert, this macro will break the build if the
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 350 * supplied condition is *false*, emitting the supplied error message if the
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 351 * compiler has support to do so.
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 352 */
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 353 #define compiletime_assert(condition, msg) \
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 @354 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>> eb5c2d4b45e3d2 Will Deacon 2020-07-21 355
>>
>> --
>> 0-DAY CI Kernel Test Service
>> https://01.org/lkp
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