Buildresult: linus/um-allmodconfig/um-x86_64 built on Oct 2 2020, 14:58

kisskb

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Status:	Failed
Date/Time:	Oct 2 2020, 14:58
Duration:	0:09:56.046935
Builder:	ka1
Revision:	pipe: remove pipe_wait() and fix wakeup race with splice (`472e5b056f000a778abb41f1e443de58eb259783)`
Target:	linus/um-allmodconfig/um-x86_64
Branch:	linus
Compiler:	um-x86_64 (x86_64-linux-gcc.br_real (Buildroot 2017.05) 5.4.0 / GNU ld (GNU Binutils) 2.27)
Config:	allmodconfig (download)
Log:	Download original Possible errors ERROR: modpost: "devm_platform_ioremap_resource" [drivers/iio/adc/adi-axi-adc.ko] undefined! ERROR: modpost: "devm_platform_ioremap_resource" [drivers/ptp/ptp_ines.ko] undefined! ERROR: modpost: "devm_ioremap_resource" [drivers/net/ethernet/xilinx/xilinx_emac.ko] undefined! ERROR: modpost: "devm_platform_ioremap_resource_byname" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! ERROR: modpost: "devm_ioremap" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! ERROR: modpost: "devm_of_iomap" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! make[2]: * [scripts/Makefile.modpost:111: Module.symvers] Error 1 make[1]: * [Makefile:1388: modules] Error 2 make: * [Makefile:185: __sub-make] Error 2 Possible warnings (7) .config:4320:warning: override: reassigning to symbol UML_NET_ETHERTAP .config:4322:warning: override: reassigning to symbol UML_NET_SLIP .config:4325:warning: override: reassigning to symbol UML_NET_MCAST .config:4327:warning: override: reassigning to symbol UML_NET_SLIRP arch/um/os-Linux/signal.c:51:1: warning: the frame size of 2976 bytes is larger than 2048 bytes [-Wframe-larger-than=] arch/um/os-Linux/signal.c:95:1: warning: the frame size of 2960 bytes is larger than 2048 bytes [-Wframe-larger-than=] lib/lz4/lz4hc_compress.c:579:1: warning: the frame size of 2144 bytes is larger than 2048 bytes [-Wframe-larger-than=] Full Log # git rev-parse -q --verify 472e5b056f000a778abb41f1e443de58eb259783^{commit} 472e5b056f000a778abb41f1e443de58eb259783 already have revision, skipping fetch # git checkout -q -f -B kisskb 472e5b056f000a778abb41f1e443de58eb259783 # git clean -qxdf # < git log -1 # commit 472e5b056f000a778abb41f1e443de58eb259783 # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Thu Oct 1 19:14:36 2020 -0700 # # pipe: remove pipe_wait() and fix wakeup race with splice # # The pipe splice code still used the old model of waiting for pipe IO by # using a non-specific "pipe_wait()" that waited for any pipe event to # happen, which depended on all pipe IO being entirely serialized by the # pipe lock. So by checking the state you were waiting for, and then # adding yourself to the wait queue before dropping the lock, you were # guaranteed to see all the wakeups. # # Strictly speaking, the actual wakeups were not done under the lock, but # the pipe_wait() model still worked, because since the waiter held the # lock when checking whether it should sleep, it would always see the # current state, and the wakeup was always done after updating the state. # # However, commit 0ddad21d3e99 ("pipe: use exclusive waits when reading or # writing") split the single wait-queue into two, and in the process also # made the "wait for event" code wait for _two_ wait queues, and that then # showed a race with the wakers that were not serialized by the pipe lock. # # It's only splice that used that "pipe_wait()" model, so the problem # wasn't obvious, but Josef Bacik reports: # # "I hit a hang with fstest btrfs/187, which does a btrfs send into # /dev/null. This works by creating a pipe, the write side is given to # the kernel to write into, and the read side is handed to a thread that # splices into a file, in this case /dev/null. # # The box that was hung had the write side stuck here [pipe_write] and # the read side stuck here [splice_from_pipe_next -> pipe_wait]. # # [ more details about pipe_wait() scenario ] # # The problem is we're doing the prepare_to_wait, which sets our state # each time, however we can be woken up either with reads or writes. In # the case above we race with the WRITER waking us up, and re-set our # state to INTERRUPTIBLE, and thus never break out of schedule" # # Josef had a patch that avoided the issue in pipe_wait() by just making # it set the state only once, but the deeper problem is that pipe_wait() # depends on a level of synchonization by the pipe mutex that it really # shouldn't. And the whole "wait for any pipe state change" model really # isn't very good to begin with. # # So rather than trying to work around things in pipe_wait(), remove that # legacy model of "wait for arbitrary pipe event" entirely, and actually # create functions that wait for the pipe actually being readable or # writable, and can do so without depending on the pipe lock serializing # everything. # # Fixes: 0ddad21d3e99 ("pipe: use exclusive waits when reading or writing") # Link: https://lore.kernel.org/linux-fsdevel/bfa88b5ad6f069b2b679316b9e495a970130416c.1601567868.git.josef@toxicpanda.com/ # Reported-by: Josef Bacik <josef@toxicpanda.com> # Reviewed-and-tested-by: Josef Bacik <josef@toxicpanda.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 472e5b056f000a778abb41f1e443de58eb259783 # < make -s -j 8 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 allmodconfig # Added to kconfig CONFIG_STANDALONE=y # Added to kconfig CONFIG_KCOV=n # Added to kconfig CONFIG_GCC_PLUGINS=n # Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n # Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n # Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n # Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n # Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n # Added to kconfig CONFIG_UML_NET=n # Added to kconfig CONFIG_UML_NET_ETHERTAP=n # Added to kconfig CONFIG_UML_NET_TUNTAP=n # Added to kconfig CONFIG_UML_NET_SLIP=n # Added to kconfig CONFIG_UML_NET_DAEMON=n # Added to kconfig CONFIG_UML_NET_VDE=n # Added to kconfig CONFIG_UML_NET_MCAST=n # Added to kconfig CONFIG_UML_NET_PCAP=n # Added to kconfig CONFIG_UML_NET_SLIRP=n # Added to kconfig CONFIG_GCOV_KERNEL=n # Added to kconfig CONFIG_DEBUG_INFO_BTF=n # < make -s -j 8 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help # make -s -j 8 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig .config:4320:warning: override: reassigning to symbol UML_NET_ETHERTAP .config:4322:warning: override: reassigning to symbol UML_NET_SLIP .config:4325:warning: override: reassigning to symbol UML_NET_MCAST .config:4327:warning: override: reassigning to symbol UML_NET_SLIRP # make -s -j 8 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 /kisskb/src/arch/um/os-Linux/signal.c: In function 'sig_handler_common': /kisskb/src/arch/um/os-Linux/signal.c:51:1: warning: the frame size of 2976 bytes is larger than 2048 bytes [-Wframe-larger-than=] } ^ /kisskb/src/arch/um/os-Linux/signal.c: In function 'timer_real_alarm_handler': /kisskb/src/arch/um/os-Linux/signal.c:95:1: warning: the frame size of 2960 bytes is larger than 2048 bytes [-Wframe-larger-than=] } ^ /kisskb/src/lib/lz4/lz4hc_compress.c: In function 'LZ4HC_compress_generic': /kisskb/src/lib/lz4/lz4hc_compress.c:579:1: warning: the frame size of 2144 bytes is larger than 2048 bytes [-Wframe-larger-than=] } ^ LINK linux ERROR: modpost: "devm_platform_ioremap_resource" [drivers/iio/adc/adi-axi-adc.ko] undefined! ERROR: modpost: "devm_platform_ioremap_resource" [drivers/ptp/ptp_ines.ko] undefined! ERROR: modpost: "devm_ioremap_resource" [drivers/net/ethernet/xilinx/xilinx_emac.ko] undefined! ERROR: modpost: "devm_platform_ioremap_resource_byname" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! ERROR: modpost: "devm_ioremap" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! ERROR: modpost: "devm_of_iomap" [drivers/net/ethernet/xilinx/ll_temac.ko] undefined! make[2]: * [/kisskb/src/scripts/Makefile.modpost:111: Module.symvers] Error 1 make[2]: * Deleting file 'Module.symvers' make[1]: * [/kisskb/src/Makefile:1388: modules] Error 2 make: *** [Makefile:185: __sub-make] Error 2 Command 'make -s -j 8 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2 # rm -rf /kisskb/build/linus_um-allmodconfig_um-x86_64 # Build took: 0:09:56.046935

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