bisecting cause commit starting from 2865ba82476a6b2603db40cfc1c8c0831409fb41
building syzkaller on 07e953c105af057cb474bc086f68fb7ec5b241ec
testing commit 2865ba82476a6b2603db40cfc1c8c0831409fb41
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 746662267ca1a876f26b1203a6bf4cafd9a3a37faedb68bff68f729dea6a9470
all runs: crashed: general protection fault in bpf_skb_cgroup_id
testing release v5.14
testing commit 7d2a07b769330c34b4deabeed939325c77a7ec2f
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 8c219514f33cf5f7e995cffb6643e798eb9f0e406da2dbcbb7423680d5a3f503
all runs: OK
# git bisect start 2865ba82476a6b2603db40cfc1c8c0831409fb41 7d2a07b769330c34b4deabeed939325c77a7ec2f
Bisecting: 4988 revisions left to test after this (roughly 12 steps)
[0d290223a6c77107b1c3988959e49279a8dafaba] Merge tag 'sound-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

testing commit 0d290223a6c77107b1c3988959e49279a8dafaba
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 4f4c373d75524ee5d41a15f4b700b49630e44c880e37ab2ac3a87b7305b3164b
run #0: basic kernel testing failed: KFENCE: use-after-free in kvm_fastop_exception
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
# git bisect good 0d290223a6c77107b1c3988959e49279a8dafaba
Bisecting: 2517 revisions left to test after this (roughly 11 steps)
[1c500ad706383f1a6609e63d0b5d1723fd84dab9] loop: reduce the loop_ctl_mutex scope

testing commit 1c500ad706383f1a6609e63d0b5d1723fd84dab9
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 7408278ff9dd84fe297aeef3e3ee85b32ee52c860bc6cac50b5d76c66407ea3e
all runs: OK
# git bisect good 1c500ad706383f1a6609e63d0b5d1723fd84dab9
Bisecting: 1265 revisions left to test after this (roughly 10 steps)
[3de18c865f504ab59ed2588b1e11acd4bcb9ea09] Merge branch 'stable/for-linus-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

testing commit 3de18c865f504ab59ed2588b1e11acd4bcb9ea09
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: c16821c5e9537c235b36c886103475beb4d5ba1f611787d39bdfd7b9ee6c1c15
all runs: OK
# git bisect good 3de18c865f504ab59ed2588b1e11acd4bcb9ea09
Bisecting: 656 revisions left to test after this (roughly 9 steps)
[58ca24158758f1784400d32743373d7d6227d018] Merge tag 'trace-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

testing commit 58ca24158758f1784400d32743373d7d6227d018
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: e38602a0687196019678eea613b91531812f34905071007b27836067a6a8b4ad
all runs: OK
# git bisect good 58ca24158758f1784400d32743373d7d6227d018
Bisecting: 388 revisions left to test after this (roughly 8 steps)
[a2b28235335fee2586b4bd16448fb59ed6c80eef] Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging

testing commit a2b28235335fee2586b4bd16448fb59ed6c80eef
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 3fc844170f857db9edb86cd2cf9e7a12f2b440ef3c756b5c36007b0ca2866cca
run #0: basic kernel testing failed: KFENCE: use-after-free in kvm_fastop_exception
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
# git bisect good a2b28235335fee2586b4bd16448fb59ed6c80eef
Bisecting: 166 revisions left to test after this (roughly 8 steps)
[e99314a340d27efafab3b7ea226beb239162cd46] Merge tag 'kvmarm-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

testing commit e99314a340d27efafab3b7ea226beb239162cd46
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: cf3eb88facb5c12fb25995dd17baeeb208e07fbcaafe8619fd771fca414a9d76
all runs: OK
# git bisect good e99314a340d27efafab3b7ea226beb239162cd46
Bisecting: 83 revisions left to test after this (roughly 6 steps)
[0f77f2defaf682eb7e7ef623168e49c74ae529e3] ieee802154: Remove redundant initialization of variable ret

testing commit 0f77f2defaf682eb7e7ef623168e49c74ae529e3
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 0f77f2defaf682eb7e7ef623168e49c74ae529e3
Bisecting: 83 revisions left to test after this (roughly 6 steps)
[0f31ab217dc52a3044044d416be0248b1778c4da] dt-bindings: net: sun8i-emac: Add compatible for D1

testing commit 0f31ab217dc52a3044044d416be0248b1778c4da
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: bf65bf826c24b608466ad369a08d60c9de3866cea6c146dded140d9799648b0e
all runs: OK
# git bisect good 0f31ab217dc52a3044044d416be0248b1778c4da
Bisecting: 29 revisions left to test after this (roughly 5 steps)
[20e100f52730cd0db609e559799c1712b5f27582] qed: Handle management FW error

testing commit 20e100f52730cd0db609e559799c1712b5f27582
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 47faba3315b80834e00af066e14a8b72abb71e6528c69f3371042d5888bdc8b9
all runs: OK
# git bisect good 20e100f52730cd0db609e559799c1712b5f27582
Bisecting: 14 revisions left to test after this (roughly 4 steps)
[f7ec554b73c5239a96afb9a9c3eb18cb11f539b7] net: hns3: add option to turn off page pool feature

testing commit f7ec554b73c5239a96afb9a9c3eb18cb11f539b7
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: a850b758cddd9cbbf39d1dec1638f57c282b7c38c6979aee4dfdffa3060372e1
all runs: OK
# git bisect good f7ec554b73c5239a96afb9a9c3eb18cb11f539b7
Bisecting: 7 revisions left to test after this (roughly 3 steps)
[43d2b88c29f2d120b4dc22f27b3483eb14bd9815] bpf, selftests: Add test case for mixed cgroup v1/v2

testing commit 43d2b88c29f2d120b4dc22f27b3483eb14bd9815
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 43d2b88c29f2d120b4dc22f27b3483eb14bd9815
Bisecting: 7 revisions left to test after this (roughly 3 steps)
[550ac9c1aaaaf51fd42e20d461f0b1cdbd55b3d2] net-caif: avoid user-triggerable WARN_ON(1)

testing commit 550ac9c1aaaaf51fd42e20d461f0b1cdbd55b3d2
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 167b3786d1e11edc6e3a59d2dc3a88abaa008d235f08344aff2b3943c6128b46
all runs: OK
# git bisect good 550ac9c1aaaaf51fd42e20d461f0b1cdbd55b3d2
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[0e6491b559704da720f6da09dd0a52c4df44c514] bpf: Add oversize check before call kvcalloc()

testing commit 0e6491b559704da720f6da09dd0a52c4df44c514
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 0e6491b559704da720f6da09dd0a52c4df44c514
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[2f1aaf3ea666b737ad717b3d88667225aca23149] bpf, mm: Fix lockdep warning triggered by stack_map_get_build_id_offset()

testing commit 2f1aaf3ea666b737ad717b3d88667225aca23149
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 2f1aaf3ea666b737ad717b3d88667225aca23149
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[3a029e1f3d6e2ee809e85abecce619a48016bd4b] selftests/bpf: Fix build of task_pt_regs test for arm64

testing commit 3a029e1f3d6e2ee809e85abecce619a48016bd4b
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 3a029e1f3d6e2ee809e85abecce619a48016bd4b
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[8520e224f547cd070c7c8f97b1fc6d58cff7ccaa] bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode

testing commit 8520e224f547cd070c7c8f97b1fc6d58cff7ccaa
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 8520e224f547cd070c7c8f97b1fc6d58cff7ccaa
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[d8079d8026f82e4435445297d1b77bba1c4c7960] bpf, selftests: Add cgroup v1 net_cls classid helpers

testing commit d8079d8026f82e4435445297d1b77bba1c4c7960
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip d8079d8026f82e4435445297d1b77bba1c4c7960
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[49ca6153208f6efc409c1deb82dd5bcbb519d7e1] bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause

testing commit 49ca6153208f6efc409c1deb82dd5bcbb519d7e1
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration]
# git bisect skip 49ca6153208f6efc409c1deb82dd5bcbb519d7e1
There are only 'skip'ped commits left to test.
The first bad commit could be any of:
0e6491b559704da720f6da09dd0a52c4df44c514
2f1aaf3ea666b737ad717b3d88667225aca23149
8520e224f547cd070c7c8f97b1fc6d58cff7ccaa
3a029e1f3d6e2ee809e85abecce619a48016bd4b
d8079d8026f82e4435445297d1b77bba1c4c7960
43d2b88c29f2d120b4dc22f27b3483eb14bd9815
49ca6153208f6efc409c1deb82dd5bcbb519d7e1
2865ba82476a6b2603db40cfc1c8c0831409fb41
We cannot bisect more!

revisions tested: 12, total time: 3h47m51.856097213s (build: 2h3m8.074620013s, test: 1h42m53.576691404s)
bisection is inconclusive, the first bad commit could be any of:
0e6491b559704da720f6da09dd0a52c4df44c514
2f1aaf3ea666b737ad717b3d88667225aca23149
8520e224f547cd070c7c8f97b1fc6d58cff7ccaa
3a029e1f3d6e2ee809e85abecce619a48016bd4b
d8079d8026f82e4435445297d1b77bba1c4c7960
43d2b88c29f2d120b4dc22f27b3483eb14bd9815
49ca6153208f6efc409c1deb82dd5bcbb519d7e1
2865ba82476a6b2603db40cfc1c8c0831409fb41