bisecting cause commit starting from eee7ede695cfbb19fefdeb14992535b605448f35
building syzkaller on 4c37c133e4bf703d023995535f1e264d8658e08e
testing commit eee7ede695cfbb19fefdeb14992535b605448f35 with gcc (GCC) 10.2.1 20210217
kernel signature: 767112fcde7785697f0d071af54909804e10f76bed2417e105bfd1fb1cf05bb9
all runs: crashed: possible deadlock in ipv6_sock_mc_close
testing release v5.11
testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217
kernel signature: 502ad52704fa1263450a8f60089c4e01f68858c9b2c89c4d14a71d67aa041092
run #0: crashed: SYZFAIL: wrong response packet
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
reproducer seems to be flaky
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 10.2.1 20210217
kernel signature: 0ca9dcf3af21d1a5232536de4f8c9778d9f136c1a60b7c1c645fc9418ee2b463
all runs: OK
# git bisect start f40ddce88593482919761f74910f42f4b84c004b 2c85ebc57b3e1817b6ce1a6b703928e113a90442
Bisecting: 7761 revisions left to test after this (roughly 13 steps)
[538fcf57aaee6ad78a05f52b69a99baa22b33418] Merge branches 'acpi-scan', 'acpi-pnp' and 'acpi-sleep'

testing commit 538fcf57aaee6ad78a05f52b69a99baa22b33418 with gcc (GCC) 10.2.1 20210217
kernel signature: 957ec34ad142304fe198b2e4bff938931ec21f18f2028b8786501e062a4d8a64
all runs: OK
# git bisect good 538fcf57aaee6ad78a05f52b69a99baa22b33418
Bisecting: 3868 revisions left to test after this (roughly 12 steps)
[d64c6f96ba86bd8b97ed8d6762a8c8cc1770d214] Merge tag 'net-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

testing commit d64c6f96ba86bd8b97ed8d6762a8c8cc1770d214 with gcc (GCC) 10.2.1 20210217
kernel signature: 28507d0eed699e6d2b4f78a079899d2962d38d2a2ac706835792e0bbb8a7476a
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad d64c6f96ba86bd8b97ed8d6762a8c8cc1770d214
Bisecting: 1915 revisions left to test after this (roughly 11 steps)
[f68e4041ef63f03091e44b4eebf1ab5c5d427e6f] Merge tag 'pinctrl-v5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl

testing commit f68e4041ef63f03091e44b4eebf1ab5c5d427e6f with gcc (GCC) 10.2.1 20210217
kernel signature: fb8cdd5280b4dde5a5173212b901c268bd160020ada0964644587b835849a813
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad f68e4041ef63f03091e44b4eebf1ab5c5d427e6f
Bisecting: 1009 revisions left to test after this (roughly 10 steps)
[005b2a9dc819a1265a8c765595f8f6d88d6173d9] Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block

testing commit 005b2a9dc819a1265a8c765595f8f6d88d6173d9 with gcc (GCC) 10.2.1 20210217
kernel signature: 2e6e4202f9eab2f46fcf9423138486053fec4fb6812658d5cd06666666dce344
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 005b2a9dc819a1265a8c765595f8f6d88d6173d9
Bisecting: 431 revisions left to test after this (roughly 9 steps)
[1a50ede2b3c846761a71c409f53e9121311a13c2] Merge tag 'nfsd-5.11' of git://git.linux-nfs.org/projects/cel/cel-2.6

testing commit 1a50ede2b3c846761a71c409f53e9121311a13c2 with gcc (GCC) 10.2.1 20210217
kernel signature: 678b4f105ee068d0a8a66bf86831a8694a3e7bf3d637d65ca65c9751eb5baec6
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 1a50ede2b3c846761a71c409f53e9121311a13c2
Bisecting: 336 revisions left to test after this (roughly 8 steps)
[b42fe98c92698d2a10094997e5f4d2dd968fd44f] btrfs: scrub: allow scrub to work with subpage sectorsize

testing commit b42fe98c92698d2a10094997e5f4d2dd968fd44f with gcc (GCC) 10.2.1 20210217
kernel signature: f451810fcdd75c70db9a8a03f66d86e3b9fc8329658d283b7de31c9e9dc0d690
all runs: OK
# git bisect good b42fe98c92698d2a10094997e5f4d2dd968fd44f
Bisecting: 168 revisions left to test after this (roughly 7 steps)
[ef9df0011791ce302b646e2adf3c698f3b20b90a] Merge tag 'rproc-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

testing commit ef9df0011791ce302b646e2adf3c698f3b20b90a with gcc (GCC) 10.2.1 20210217
kernel signature: db6a5117c31b85e871bdfe6c6267359e9b4e49fc476110b59ceddcf43aa11110
all runs: OK
# git bisect good ef9df0011791ce302b646e2adf3c698f3b20b90a
Bisecting: 84 revisions left to test after this (roughly 6 steps)
[2548aa784d760567c2a77cbd8b7c55b211167c37] NFSD: Add a separate decoder to handle state_protect_ops

testing commit 2548aa784d760567c2a77cbd8b7c55b211167c37 with gcc (GCC) 10.2.1 20210217
kernel signature: 2cbd196c19cacafa0e2d9058493f60ed7eafcd0bddeb7b67f799ea9eb8d161aa
all runs: OK
# git bisect good 2548aa784d760567c2a77cbd8b7c55b211167c37
Bisecting: 42 revisions left to test after this (roughly 5 steps)
[ba5e8187c55555519ae0b63c0fb681391bc42af9] nfsd: allow filesystems to opt out of subtree checking

testing commit ba5e8187c55555519ae0b63c0fb681391bc42af9 with gcc (GCC) 10.2.1 20210217
kernel signature: 8eb223990985a404f6cbff09458514e29c04f8e26e66ed72cf7a65039dd65b6b
run #0: crashed: SYZFAIL: wrong response packet
run #1: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad ba5e8187c55555519ae0b63c0fb681391bc42af9
Bisecting: 20 revisions left to test after this (roughly 4 steps)
[2846bb0525a73e00b3566fda535ea6a5879e2971] NFSD: Replace READ* macros in nfsd4_decode_offload_status()

testing commit 2846bb0525a73e00b3566fda535ea6a5879e2971 with gcc (GCC) 10.2.1 20210217
kernel signature: 23a310b1d5f696a2b6a96ec3a5a4b8ead840feab2cb5fd97f9d202935cbf6975
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad 2846bb0525a73e00b3566fda535ea6a5879e2971
Bisecting: 10 revisions left to test after this (roughly 3 steps)
[c8e88e3aa73889421461f878cd569ef84f231ceb] NFSD: Replace READ* macros in nfsd4_decode_layoutget()

testing commit c8e88e3aa73889421461f878cd569ef84f231ceb with gcc (GCC) 10.2.1 20210217
kernel signature: e49755c98e771deb381c00695276ab62225ae7ee301bc106919bf65b0f978844
run #0: crashed: SYZFAIL: wrong response packet
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
# git bisect bad c8e88e3aa73889421461f878cd569ef84f231ceb
Bisecting: 4 revisions left to test after this (roughly 2 steps)
[81243e3fe37ed547fc4ed8aab1cec2865540bb18] NFSD: Replace READ* macros in nfsd4_decode_create_session()

testing commit 81243e3fe37ed547fc4ed8aab1cec2865540bb18 with gcc (GCC) 10.2.1 20210217
kernel signature: 3404adeb0be7204634cee1189160abc55d6def723cee89be3309568c1ae97a3e
all runs: OK
# git bisect good 81243e3fe37ed547fc4ed8aab1cec2865540bb18
Bisecting: 2 revisions left to test after this (roughly 1 step)
[aec387d5909304810d899f7d90ae57df33f3a75c] NFSD: Replace READ* macros in nfsd4_decode_free_stateid()

testing commit aec387d5909304810d899f7d90ae57df33f3a75c with gcc (GCC) 10.2.1 20210217
kernel signature: f239e775ab2d4b8557909dbee7ea375a77c1bba9968beb1a3d2d7eead7cff8b8
all runs: OK
# git bisect good aec387d5909304810d899f7d90ae57df33f3a75c
Bisecting: 0 revisions left to test after this (roughly 1 step)
[5185980d8a23001c2317c290129ab7ab20067e20] NFSD: Replace READ* macros in nfsd4_decode_layoutcommit()

testing commit 5185980d8a23001c2317c290129ab7ab20067e20 with gcc (GCC) 10.2.1 20210217
kernel signature: d9a016192cab1606286b6a8d5f6ebb11cd5fe04de179e762e943c351a7b14797
all runs: OK
# git bisect good 5185980d8a23001c2317c290129ab7ab20067e20
c8e88e3aa73889421461f878cd569ef84f231ceb is the first bad commit
commit c8e88e3aa73889421461f878cd569ef84f231ceb
Author: Chuck Lever <chuck.lever@oracle.com>
Date:   Tue Nov 3 15:06:04 2020 -0500

    NFSD: Replace READ* macros in nfsd4_decode_layoutget()
    
    Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

 fs/nfsd/nfs4xdr.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

culprit signature: e49755c98e771deb381c00695276ab62225ae7ee301bc106919bf65b0f978844
parent  signature: d9a016192cab1606286b6a8d5f6ebb11cd5fe04de179e762e943c351a7b14797
Reproducer flagged being flaky
revisions tested: 17, total time: 5h11m48.986817508s (build: 1h57m14.218835621s, test: 3h12m13.157167789s)
first bad commit: c8e88e3aa73889421461f878cd569ef84f231ceb NFSD: Replace READ* macros in nfsd4_decode_layoutget()
recipients (to): ["bfields@fieldses.org" "chuck.lever@oracle.com" "chuck.lever@oracle.com" "linux-nfs@vger.kernel.org"]
recipients (cc): ["linux-kernel@vger.kernel.org"]
crash: SYZFAIL: wrong response packet
2021/02/28 12:17:31 result: hanged=false err=executor 3: failed to write control pipe: write |1: broken pipe
SYZFAIL: wrong response packet
 (errno 16: Device or resource busy)
loop exited with status 67
2021/02/28 12:17:34 executed programs: 33
2021/02/28 12:17:39 executed programs: 213