bisecting cause commit starting from 3e12361b6d23f793580a50a6008633501c56ea1d building syzkaller on 6c236867ce33c0c16b102e02a08226d7eb9b2046 testing commit 3e12361b6d23f793580a50a6008633501c56ea1d compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 529260992d8236af0bab2c81e02cc5b3c638d03f2c48cfe17f86a6bbfd869b63 run #0: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #8: crashed: KASAN: use-after-free Read in __crypto_xor run #9: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #10: crashed: KASAN: use-after-free Read in __crypto_xor run #11: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #12: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #13: crashed: KASAN: use-after-free Read in __crypto_xor run #14: crashed: KASAN: use-after-free Read in __crypto_xor run #15: crashed: KASAN: use-after-free Read in __crypto_xor run #16: crashed: KASAN: use-after-free Read in __crypto_xor run #17: crashed: KASAN: use-after-free Read in __crypto_xor run #18: crashed: no output from test machine run #19: crashed: no output from test machine testing release v5.13 testing commit 62fb9874f5da54fdb243003b386128037319b219 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 909f5b513362d755e99068620c19525cb2afd91ca8725228219fd46574a48866 run #0: crashed: KASAN: use-after-free Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor testing release v5.12 testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: bb4e26dd8f4a005b0fd76547575ef29621d4d502b5251ddaf0a5696974104629 run #0: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: use-after-free Read in __crypto_xor run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor testing release v5.11 testing commit f40ddce88593482919761f74910f42f4b84c004b compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 3222e6ed80513dd888ba5df1ed0bb0fed90b38311471a07f8ebfef14f678fd42 run #0: crashed: KASAN: use-after-free Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in __crypto_xor run #8: crashed: KASAN: use-after-free Read in __crypto_xor run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor testing release v5.10 testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 35c88fb67e0626f0232c5254d6e9f188ff33bdc5ecf75a2e20b39b0354577e82 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: use-after-free Read in __crypto_xor run #2: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in __crypto_xor run #8: crashed: KASAN: use-after-free Read in __crypto_xor run #9: crashed: no output from test machine testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 4753fc6113ccf19b73886623e431f1d42203e5df7900561c23ce4babeaf8f756 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: no output from test machine run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 64bef9c619e4f9660afe7c971d6b25d7fe2654ae1e3be1137534ef774e1b1619 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: use-after-free Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in __crypto_xor run #8: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #9: crashed: KASAN: use-after-free Read in __crypto_xor testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: f76fe31c01316385978519b5b4e89add706a0c3d5fe63afc28097ce825bd70af all runs: OK # git bisect start bcf876870b95592b52519ed4aafcf9d95999bc9c 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 Bisecting: 8752 revisions left to test after this (roughly 13 steps) [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc testing commit 694b5a5d313f3997764b67d52bab66ec7e59e714 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 2af513036d7bbc070a91132b60254ca3d03a71c966ed0e6dac60d0a6703d8d88 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: no output from test machine run #9: crashed: no output from test machine # git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714 Bisecting: 4417 revisions left to test after this (roughly 12 steps) [2e63f6ce7ed2c4ff83ba30ad9ccad422289a6c63] Merge branch 'uaccess.comedi' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs testing commit 2e63f6ce7ed2c4ff83ba30ad9ccad422289a6c63 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 5ac85afd45025a85439f51bafa51c3084d8647ddaea167b1c95dfdead59737ef all runs: OK # git bisect good 2e63f6ce7ed2c4ff83ba30ad9ccad422289a6c63 Bisecting: 2208 revisions left to test after this (roughly 11 steps) [5df42c8267418bfb8da54cc4772b397ea4c88aea] ice: fix MAC write command testing commit 5df42c8267418bfb8da54cc4772b397ea4c88aea compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 7a5ffc26a362d44d8a1b69857477c5e49e92b3d4944cfc9e2d228c0e6299ffb5 all runs: OK # git bisect good 5df42c8267418bfb8da54cc4772b397ea4c88aea Bisecting: 1032 revisions left to test after this (roughly 10 steps) [a98f670e41a99f53acb1fb33cee9c6abbb2e6f23] Merge tag 'media/v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit a98f670e41a99f53acb1fb33cee9c6abbb2e6f23 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 013049a236619e40f9d04003626dc113f91034e71fa776b12e62c97cc89d6b28 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in __crypto_xor run #8: crashed: KASAN: use-after-free Read in __crypto_xor run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor # git bisect bad a98f670e41a99f53acb1fb33cee9c6abbb2e6f23 Bisecting: 636 revisions left to test after this (roughly 9 steps) [c444eb564fb16645c172d550359cb3d75fe8a040] mm: thp: make the THP mapcount atomic against __split_huge_pmd_locked() testing commit c444eb564fb16645c172d550359cb3d75fe8a040 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 9f17664e957a7ed7d4964c0ed5f0f64eb14e3bbdea5585cf6ddcebb5d809144f all runs: OK # git bisect good c444eb564fb16645c172d550359cb3d75fe8a040 Bisecting: 318 revisions left to test after this (roughly 8 steps) [3b5af3171e2d5a73ae6f04965ed653d039904eb6] media: cec: silence shift wrapping warning in __cec_s_log_addrs() testing commit 3b5af3171e2d5a73ae6f04965ed653d039904eb6 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: db696aeb5e2e579ff2fec384b6036b67970a311f5f7dfcb3cd946b7e47884174 all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1) # git bisect skip 3b5af3171e2d5a73ae6f04965ed653d039904eb6 Bisecting: 318 revisions left to test after this (roughly 8 steps) [abb242f57196dbaa108271575353a0453f6834ef] mm: memcontrol: fix stat-corrupting race in charge moving testing commit abb242f57196dbaa108271575353a0453f6834ef compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 9dd99a8015723d5f129666b75c39c17b1b32958fb494a53b1aacb3b5c25c1a4b run #0: crashed: KASAN: use-after-free Write in pcrypt_aead_enc run #1: crashed: KASAN: use-after-free Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #4: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #5: crashed: KASAN: use-after-free Read in __crypto_xor run #6: crashed: KASAN: use-after-free Read in __crypto_xor run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine # git bisect bad abb242f57196dbaa108271575353a0453f6834ef Bisecting: 41 revisions left to test after this (roughly 5 steps) [3334a45eb9e2bb040c880ef65e1d72357a0a008b] mm/page_alloc: use ac->high_zoneidx for classzone_idx testing commit 3334a45eb9e2bb040c880ef65e1d72357a0a008b compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: ba10f2b37ca2518f89da6e377f6508e7493e3bc3036c47b136d440f0fa115227 all runs: OK # git bisect good 3334a45eb9e2bb040c880ef65e1d72357a0a008b Bisecting: 20 revisions left to test after this (roughly 4 steps) [a980df33e9351e5474c06ec0fd96b2f409e2ff22] khugepaged: drain all LRU caches before scanning pages testing commit a980df33e9351e5474c06ec0fd96b2f409e2ff22 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: f051ddc11a3664023401355810963263a3cce965e1624ea6249ec3da0f1d7b3f run #0: crashed: KASAN: use-after-free Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #2: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #4: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #9: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor # git bisect bad a980df33e9351e5474c06ec0fd96b2f409e2ff22 Bisecting: 10 revisions left to test after this (roughly 3 steps) [305dacf77952e6e62405f916654f38423c78ab2f] padata: remove exit routine testing commit 305dacf77952e6e62405f916654f38423c78ab2f compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 2f1bebbd15ffce51af0df798b6cd758bcabd1ee618ee8c9045905aebb3714584 all runs: OK # git bisect good 305dacf77952e6e62405f916654f38423c78ab2f Bisecting: 5 revisions left to test after this (roughly 3 steps) [e44431498f5fbf427f139aa413cf381b4fa3a600] mm: parallelize deferred_init_memmap() testing commit e44431498f5fbf427f139aa413cf381b4fa3a600 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: e76da64cbd0bc5417ec751dd33ad79041d5a31d9e6f91195c9f15409ee789d75 run #0: crashed: KASAN: use-after-free Read in __crypto_xor run #1: crashed: KASAN: use-after-free Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #8: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #9: crashed: KASAN: use-after-free Read in __crypto_xor # git bisect bad e44431498f5fbf427f139aa413cf381b4fa3a600 Bisecting: 1 revision left to test after this (roughly 1 step) [004ed42638f4428e70ead59d170f3d17ff761a0f] padata: add basic support for multithreaded jobs testing commit 004ed42638f4428e70ead59d170f3d17ff761a0f compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 12dbab348c9a7e5f1b402a8eb712c4fad5ecfc8ddfd6b2659926d4d34fca81e8 run #0: crashed: KASAN: use-after-free Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: use-after-free Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: use-after-free Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: KASAN: use-after-free Read in __crypto_xor run #9: crashed: no output from test machine # git bisect bad 004ed42638f4428e70ead59d170f3d17ff761a0f Bisecting: 0 revisions left to test after this (roughly 1 step) [4611ce22468895acd61fee9ac1da810d60617d9a] padata: allocate work structures for parallel jobs from a pool testing commit 4611ce22468895acd61fee9ac1da810d60617d9a compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: adc1acf11d0bbec7d3d79ad3e369573929570256cfcd08e90355144a1103f346 run #0: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #1: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #2: crashed: KASAN: use-after-free Read in __crypto_xor run #3: crashed: KASAN: use-after-free Read in __crypto_xor run #4: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #5: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #6: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #7: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #8: crashed: KASAN: slab-out-of-bounds Read in __crypto_xor run #9: crashed: no output from test machine # git bisect bad 4611ce22468895acd61fee9ac1da810d60617d9a Bisecting: 0 revisions left to test after this (roughly 0 steps) [f1b192b117cd418bacf42a9583d7a01855a18fe5] padata: initialize earlier testing commit f1b192b117cd418bacf42a9583d7a01855a18fe5 compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 1af68684db3b1ccf4f9076334868d1fad2ea336cd0d71519cda1edf1519af788 all runs: OK # git bisect good f1b192b117cd418bacf42a9583d7a01855a18fe5 4611ce22468895acd61fee9ac1da810d60617d9a is the first bad commit commit 4611ce22468895acd61fee9ac1da810d60617d9a Author: Daniel Jordan Date: Wed Jun 3 15:59:39 2020 -0700 padata: allocate work structures for parallel jobs from a pool padata allocates per-CPU, per-instance work structs for parallel jobs. A do_parallel call assigns a job to a sequence number and hashes the number to a CPU, where the job will eventually run using the corresponding work. This approach fit with how padata used to bind a job to each CPU round-robin, makes less sense after commit bfde23ce200e6 ("padata: unbind parallel jobs from specific CPUs") because a work isn't bound to a particular CPU anymore, and isn't needed at all for multithreaded jobs because they don't have sequence numbers. Replace the per-CPU works with a preallocated pool, which allows sharing them between existing padata users and the upcoming multithreaded user. The pool will also facilitate setting NUMA-aware concurrency limits with later users. The pool is sized according to the number of possible CPUs. With this limit, MAX_OBJ_NUM no longer makes sense, so remove it. If the global pool is exhausted, a parallel job is run in the current task instead to throttle a system trying to do too much in parallel. Signed-off-by: Daniel Jordan Signed-off-by: Andrew Morton Tested-by: Josh Triplett Cc: Alexander Duyck Cc: Alex Williamson Cc: Dan Williams Cc: Dave Hansen Cc: David Hildenbrand Cc: Herbert Xu Cc: Jason Gunthorpe Cc: Jonathan Corbet Cc: Kirill Tkhai Cc: Michal Hocko Cc: Pavel Machek Cc: Pavel Tatashin Cc: Peter Zijlstra Cc: Randy Dunlap Cc: Robert Elliott Cc: Shile Zhang Cc: Steffen Klassert Cc: Steven Sistare Cc: Tejun Heo Cc: Zi Yan Link: http://lkml.kernel.org/r/20200527173608.2885243-4-daniel.m.jordan@oracle.com Signed-off-by: Linus Torvalds include/linux/padata.h | 8 +--- kernel/padata.c | 118 ++++++++++++++++++++++++++++++++----------------- 2 files changed, 78 insertions(+), 48 deletions(-) culprit signature: adc1acf11d0bbec7d3d79ad3e369573929570256cfcd08e90355144a1103f346 parent signature: 1af68684db3b1ccf4f9076334868d1fad2ea336cd0d71519cda1edf1519af788 revisions tested: 22, total time: 5h24m3.071085806s (build: 2h13m16.344543606s, test: 3h8m2.070439983s) first bad commit: 4611ce22468895acd61fee9ac1da810d60617d9a padata: allocate work structures for parallel jobs from a pool recipients (to): ["akpm@linux-foundation.org" "daniel.m.jordan@oracle.com" "josh@joshtriplett.org" "torvalds@linux-foundation.org"] recipients (cc): [] crash: no output from test machine