bisecting cause commit starting from cee407c5cc427a7d9b21ee964fbda613e368bdff
building syzkaller on 9d751681c8ca1ef150e96f3c1e18bdcaab99c9b9
testing commit cee407c5cc427a7d9b21ee964fbda613e368bdff with gcc (GCC) 10.2.1 20210217
kernel signature: 2e647b9234b1ce0d7a81801447bde4ac37e77d76217fe963a441894c6df3bf43
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #10: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #11: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #12: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #13: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
reproducer seems to be flaky
testing release v5.11
testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217
kernel signature: c62df0fa48d38d283d2bf6d7f3c3b3007979029dff8b849ecc1b2bcf4489dd39
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: crashed: SYZFAIL: failed to mkdtemp
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 10.2.1 20210217
kernel signature: 71a98c490102fd1ecaafb6f3b49382240082154fc3b474bb5ba4bee292f50f64
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #9: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #10: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing release v5.9
testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 10.2.1 20210217
kernel signature: 7b02e64d6a8b013f8dd685eef2c29a82a8d09d7404b1f063827e5f1fc2d6c9c5
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: crashed: SYZFAIL: failed to mkdtemp
run #9: OK
run #10: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.4.1 20210217
kernel signature: 65601dd20dd97c86187a43e85f107925399bd8386e3f3a6bf6e5289be574405d
run #0: crashed: SYZFAIL: failed to mkdtemp
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #12: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #13: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.4.1 20210217
kernel signature: 5e2bb17db39990805045a8ae71bf1b5be13016e58db5e3a318bef061c19b8bf0
run #0: OK
run #1: crashed: SYZFAIL: failed to mkdtemp
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: crashed: SYZFAIL: failed to mkdtemp
run #9: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: boot failed: can't ssh into the instance
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.4.1 20210217
kernel signature: e5071e8868e3be59399c2bbf4c56fddf39928e076c14ef540aeb32b1ba605c5e
all runs: OK
# git bisect start 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 7111951b8d4973bda27ff663f2cf18b663d15b48
Bisecting: 7542 revisions left to test after this (roughly 13 steps)
[50a5de895dbe5df947b3a695777db5b2c313e065] Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

testing commit 50a5de895dbe5df947b3a695777db5b2c313e065 with gcc (GCC) 8.4.1 20210217
kernel signature: 4c7a9997fd8ebace4193654be459dfa06a634e98a0dc041d0c01d6723ac2b921
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 50a5de895dbe5df947b3a695777db5b2c313e065
Bisecting: 7542 revisions left to test after this (roughly 13 steps)
[422c032afcf57d5e8109a54912e22ffc53d99068] netfilter: flowtable: Use rw sem as flow block lock

testing commit 422c032afcf57d5e8109a54912e22ffc53d99068 with gcc (GCC) 8.4.1 20210217
kernel signature: 04a27725b8cd6e078af0e62e76f35ee95bf4f042a77e74fdc0ddadf49c9f1d54
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: crashed: WARNING in __dev_mc_add
run #13: OK
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 422c032afcf57d5e8109a54912e22ffc53d99068
Bisecting: 771 revisions left to test after this (roughly 10 steps)
[6349021701d0ba2e84e2be440258d81e198c3392] Merge branch 'mlxsw-Offload-FIFO'

testing commit 6349021701d0ba2e84e2be440258d81e198c3392 with gcc (GCC) 8.4.1 20210217
kernel signature: 3aa83a0a76a913e3318562328be1d4d7123f2cedd08fe7a19e24a010563647d8
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #13: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 6349021701d0ba2e84e2be440258d81e198c3392
Bisecting: 385 revisions left to test after this (roughly 9 steps)
[ce69e2162f158d9d4a0e513971d02dabc7d14cb7] mdio_bus: Add generic mdio_find_bus()

testing commit ce69e2162f158d9d4a0e513971d02dabc7d14cb7 with gcc (GCC) 8.4.1 20210217
kernel signature: 3976cc7dacdbd748950de2ba0aad6071cde29f3d1893cb98a6093bae22e608b0
run #0: OK
run #1: OK
run #2: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad ce69e2162f158d9d4a0e513971d02dabc7d14cb7
Bisecting: 192 revisions left to test after this (roughly 8 steps)
[807ea87032c491260bbf5fe6f5c62ec9187d2e8f] net: remove unused macro from fib_trie.c

testing commit 807ea87032c491260bbf5fe6f5c62ec9187d2e8f with gcc (GCC) 8.4.1 20210217
kernel signature: 8a56ed5f7681b190fd0e10df630d36654f2f63ad238f6211895d90f47148e3c8
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #13: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 807ea87032c491260bbf5fe6f5c62ec9187d2e8f
Bisecting: 95 revisions left to test after this (roughly 7 steps)
[0d30bbd03d8483548bed1fc1e96fc6cfd10248b1] net: dsa: mv88e6xxx: Allow PCS registers to be retrieved via ethtool

testing commit 0d30bbd03d8483548bed1fc1e96fc6cfd10248b1 with gcc (GCC) 8.4.1 20210217
kernel signature: d93c7e9840c4539a412f15a5d5860784c0cc2c87c8f650a7f9519664f8d154e3
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: crashed: SYZFAIL: failed to mkdtemp
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: crashed: SYZFAIL: failed to mkdtemp
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 0d30bbd03d8483548bed1fc1e96fc6cfd10248b1
Bisecting: 47 revisions left to test after this (roughly 6 steps)
[cac960c5912a7a63cbe77032b7b1cd60c3fee0d6] r8169: remove setting PCI_CACHE_LINE_SIZE in rtl_hw_start_8169

testing commit cac960c5912a7a63cbe77032b7b1cd60c3fee0d6 with gcc (GCC) 8.4.1 20210217
kernel signature: a9764fa9b0e2957a87b0aaa4a4c87d611ea1d0b4cd71e4802642215e6b2391ab
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad cac960c5912a7a63cbe77032b7b1cd60c3fee0d6
Bisecting: 24 revisions left to test after this (roughly 5 steps)
[cf2c9cc3980fb2aa5a71ebbe982739987100db76] mac80211: set station bandwidth from HE capability

testing commit cf2c9cc3980fb2aa5a71ebbe982739987100db76 with gcc (GCC) 8.4.1 20210217
kernel signature: 2aad84fc6ccb6eddbfe780d26da0b47a7a0273b17f5424df7d5d802ca87c923f
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad cf2c9cc3980fb2aa5a71ebbe982739987100db76
Bisecting: 11 revisions left to test after this (roughly 4 steps)
[01afc6fedffb519a98322074c645baa2b0fa041f] mac80211_hwsim: add power save support

testing commit 01afc6fedffb519a98322074c645baa2b0fa041f with gcc (GCC) 8.4.1 20210217
kernel signature: 5038fc2fa778e0ad25674edaafe0dcf832c3d70e091c93163cccc02353368088
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: crashed: SYZFAIL: failed to mkdtemp
run #10: crashed: SYZFAIL: failed to mkdtemp
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #17: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #18: OK
run #19: OK
# git bisect bad 01afc6fedffb519a98322074c645baa2b0fa041f
Bisecting: 5 revisions left to test after this (roughly 3 steps)
[7d6aa9ba4f8228c75970fc4fad27194611a548a6] Merge remote-tracking branch 'net-next/master' into mac80211-next

testing commit 7d6aa9ba4f8228c75970fc4fad27194611a548a6 with gcc (GCC) 8.4.1 20210217
kernel signature: efadbbdfe41de4189de8ae76fc74b9092ab4a0363110629294afcbe9b75d4778
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: crashed: WARNING in __dev_mc_add
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 7d6aa9ba4f8228c75970fc4fad27194611a548a6
Bisecting: 2 revisions left to test after this (roughly 2 steps)
[9bcb084f0b648d032efdbb8226fe33663f8fca79] mac80211: Always show airtime debugfs file when TXQs are enabled

testing commit 9bcb084f0b648d032efdbb8226fe33663f8fca79 with gcc (GCC) 8.4.1 20210217
kernel signature: 7aac563c567d2ba5fbb0dad2fbe792775c106ff1f9166113299fdc91c0fa7c28
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #13: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 9bcb084f0b648d032efdbb8226fe33663f8fca79
Bisecting: 0 revisions left to test after this (roughly 1 step)
[6989310f5d4327e8595664954edd40a7f99ddd0d] wireless: Use offsetof instead of custom macro.

testing commit 6989310f5d4327e8595664954edd40a7f99ddd0d with gcc (GCC) 8.4.1 20210217
kernel signature: 9ae76d044a4b8d281f70a1e2bcf4d2dd635a67051da47858e7eb7b8ca645019b
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: crashed: SYZFAIL: failed to mkdtemp
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 6989310f5d4327e8595664954edd40a7f99ddd0d
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[92ee76d4a926843d0e135aa0c2d9f57504c6876c] trivial: mac80211: fix indentation

testing commit 92ee76d4a926843d0e135aa0c2d9f57504c6876c with gcc (GCC) 8.4.1 20210217
kernel signature: fb83a3beed813de960bd2f51a73006523fea4e787b04984aadeac56c8cd264f7
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: crashed: SYZFAIL: failed to mkdtemp
run #14: crashed: SYZFAIL: mkdir(syz-tmp) failed
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 92ee76d4a926843d0e135aa0c2d9f57504c6876c
92ee76d4a926843d0e135aa0c2d9f57504c6876c is the first bad commit
commit 92ee76d4a926843d0e135aa0c2d9f57504c6876c
Author: John Crispin <john@phrozen.org>
Date:   Fri Dec 6 15:31:03 2019 +0100

    trivial: mac80211: fix indentation
    
    Signed-off-by: John Crispin <john@phrozen.org>
    Link: https://lore.kernel.org/r/20191206143103.3645-1-john@phrozen.org
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>

 include/linux/ieee80211.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

parent commit 1f4782ae2457cdd5b0e4fa0c897b5c5883cc0392 wasn't tested
testing commit 1f4782ae2457cdd5b0e4fa0c897b5c5883cc0392 with gcc (GCC) 8.4.1 20210217
kernel signature: fb83a3beed813de960bd2f51a73006523fea4e787b04984aadeac56c8cd264f7
culprit signature: fb83a3beed813de960bd2f51a73006523fea4e787b04984aadeac56c8cd264f7
parent  signature: fb83a3beed813de960bd2f51a73006523fea4e787b04984aadeac56c8cd264f7
Reproducer flagged being flaky
revisions tested: 20, total time: 5h29m10.40523535s (build: 2h21m13.267548943s, test: 3h5m33.122637099s)
first bad commit: 92ee76d4a926843d0e135aa0c2d9f57504c6876c trivial: mac80211: fix indentation
recipients (to): ["johannes.berg@intel.com" "john@phrozen.org" "linux-kernel@vger.kernel.org"]
recipients (cc): ["johannes@sipsolutions.net" "linux-wireless@vger.kernel.org"]
crash: SYZFAIL: mkdir(syz-tmp) failed
2021/03/09 10:07:16 executor failed 11 times: executor 2: exit status 67
SYZFAIL: mkdir(syz-tmp) failed
 (errno 28: No space left on device)
loop exited with status 67

SYZFAIL: mkdir(syz-tmp) failed
 (errno 28: No space left on device)
loop exited with status 67