bisecting cause commit starting from 291009f656e8eaebbdfd3a8d99f6b190a9ce9deb
building syzkaller on a52ee10ae11c1342cfca60cf3957619bcf92bd1a
testing commit 291009f656e8eaebbdfd3a8d99f6b190a9ce9deb with gcc (GCC) 10.2.1 20210217
kernel signature: 84293c503d70ba330eb747ecf755802154629e6c70c64af49c773d9af3b8f5cc
all runs: crashed: WARNING in __alloc_skb
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 10.2.1 20210217
kernel signature: 023084790012a2dae24637c36cb931cab146c3de9ad59118796efbd7f8485088
all runs: crashed: WARNING in __alloc_skb
testing release v5.9
testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 10.2.1 20210217
kernel signature: fd8adb4da0cb7aaf02efbf01b0e65caa24d5c450f9f93290c1188a5eaf2fbd53
all runs: crashed: WARNING in __alloc_skb
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.4.1 20210217
kernel signature: bc15835df41e22b71ee025c396837d9813d60b777c72f202512d1172a53ddcef
all runs: crashed: WARNING in __alloc_skb
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.4.1 20210217
kernel signature: b1c6b1d85af457a0b0dc2d9d092f5cc25cca921a7be4fa2a26887b6a8b7ea6b7
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 with gcc (GCC) 8.4.1 20210217
kernel signature: 4c085014c863a14d48f2107f6411a4cca0f08376dc08419444cecb514eb23b0c
all runs: crashed: WARNING in __alloc_skb
# 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 with gcc (GCC) 8.4.1 20210217
kernel signature: 1160d9ac2dac6da6726c6e1f90dace0c4c53ab3c83b41f7206d626602840e91d
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 with gcc (GCC) 8.4.1 20210217
kernel signature: 54343e37f233fbfd8b5ffd0b9d619863f3b23d59bc9ff46cf346ff5aec246cec
all runs: crashed: WARNING in __alloc_skb
# git bisect bad 5df42c8267418bfb8da54cc4772b397ea4c88aea
Bisecting: 1095 revisions left to test after this (roughly 10 steps)
[5d9e4722c74e8868d5fe2f8749de80928eb4a1d1] Merge tag 'wireless-drivers-next-2020-05-07' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next

testing commit 5d9e4722c74e8868d5fe2f8749de80928eb4a1d1 with gcc (GCC) 8.4.1 20210217
kernel signature: b9f65bea4f9fce50003f1dae46b865f483fba8528052ed7f5b56892be5c02143
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 5d9e4722c74e8868d5fe2f8749de80928eb4a1d1
Bisecting: 1095 revisions left to test after this (roughly 10 steps)
[b410439ca371334cd9e5772e411b5e2b6b2d0c9a] r8169: improve max jumbo packet size definition

testing commit b410439ca371334cd9e5772e411b5e2b6b2d0c9a with gcc (GCC) 8.4.1 20210217
kernel signature: 577cb1f5c765377e530f4f8f740ee1e7127c5650212a35c34ba8b7c2addf5468
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip b410439ca371334cd9e5772e411b5e2b6b2d0c9a
Bisecting: 1095 revisions left to test after this (roughly 10 steps)
[71e9378bcfd2e9dd96c2bfbef23f3562946d30b3] iwlwifi: mvm: initialize iwl_dev_tx_power_cmd to zero

testing commit 71e9378bcfd2e9dd96c2bfbef23f3562946d30b3 with gcc (GCC) 8.4.1 20210217
kernel signature: e0caad212e85b181f3bf589c79473aa231ae5ecf4a2edefce6adc77b92301461
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 71e9378bcfd2e9dd96c2bfbef23f3562946d30b3
Bisecting: 1095 revisions left to test after this (roughly 10 steps)
[931ca7ab7fe804d77bc6952f1512950c0d870f26] ip*_mc_gsfget(): lift copyout of struct group_filter into callers

testing commit 931ca7ab7fe804d77bc6952f1512950c0d870f26 with gcc (GCC) 8.4.1 20210217
kernel signature: 226b495c2b2d3fafbe9f43c5743ed75892a05a1aabdf8affbe1e38181ac6d1b6
all runs: crashed: WARNING in __alloc_skb
# git bisect bad 931ca7ab7fe804d77bc6952f1512950c0d870f26
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[367ec3e4834cbd611401c2c40a23c22c825474f1] bpf: Create file bpf iterator

testing commit 367ec3e4834cbd611401c2c40a23c22c825474f1 with gcc (GCC) 8.4.1 20210217
kernel signature: 19ebd049652f60f8b87dff9ed0f49f0c0d3c0d116a79c19d4ae8a9d88e368a5d
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 367ec3e4834cbd611401c2c40a23c22c825474f1
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[6cd35888a0db4b18a5796fe5d5863f004f8eef0f] Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next

testing commit 6cd35888a0db4b18a5796fe5d5863f004f8eef0f with gcc (GCC) 8.4.1 20210217
kernel signature: d4bbbfe8f7f21bd814120a0568d4869cef5470bf9e5804ad8e782f1e81916b4f
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 6cd35888a0db4b18a5796fe5d5863f004f8eef0f
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[6e7e034e88e8e22cb14765c86da92416017e45b8] tools, bpftool: Poison and replace kernel integer typedefs

testing commit 6e7e034e88e8e22cb14765c86da92416017e45b8 with gcc (GCC) 8.4.1 20210217
kernel signature: 517b49ad951c639843c929a2f19b4c4ef31f2b34442ba75721c4425d52ebc04f
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 6e7e034e88e8e22cb14765c86da92416017e45b8
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[e7f304607778e31bfd8e6b00ce2a8f990b265e14] kselftest: run tests by fixture

testing commit e7f304607778e31bfd8e6b00ce2a8f990b265e14 with gcc (GCC) 8.4.1 20210217
kernel signature: bf855a51c6e922d29f5ecc987f25ac4b991811872b509815c0c7319ca13d70de
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip e7f304607778e31bfd8e6b00ce2a8f990b265e14
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[8ae2473842bdbb95bfb451b130dad6a650b3ad1b] bnxt_en: Add support for L2 doorbell size.

testing commit 8ae2473842bdbb95bfb451b130dad6a650b3ad1b with gcc (GCC) 8.4.1 20210217
kernel signature: b465894a37de3b979794b3494f62b492e41bfa38ccc630ca6cd06e62aa263c22
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 8ae2473842bdbb95bfb451b130dad6a650b3ad1b
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[9a9891fbdf935c270388fca856c117ad71c02458] docs: networking: convert cxacru.txt to ReST

testing commit 9a9891fbdf935c270388fca856c117ad71c02458 with gcc (GCC) 8.4.1 20210217
kernel signature: bf855a51c6e922d29f5ecc987f25ac4b991811872b509815c0c7319ca13d70de
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 9a9891fbdf935c270388fca856c117ad71c02458
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[bc54ac3609aa0361dfeb15758b7bacf3637f6d4a] r8169: use new helper eth_hw_addr_crc

testing commit bc54ac3609aa0361dfeb15758b7bacf3637f6d4a with gcc (GCC) 8.4.1 20210217
kernel signature: 2ac6d53c03d8bf7a560da6f69c35536bb3653039aea86ec5c8e79021016779ef
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip bc54ac3609aa0361dfeb15758b7bacf3637f6d4a
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[19093313cb0486d568232934bb80dd422d891623] docs: networking: convert ipv6.txt to ReST

testing commit 19093313cb0486d568232934bb80dd422d891623 with gcc (GCC) 8.4.1 20210217
kernel signature: bf855a51c6e922d29f5ecc987f25ac4b991811872b509815c0c7319ca13d70de
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 19093313cb0486d568232934bb80dd422d891623
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[b286a0651e4404ab96cdfdcdad8a839a26b3751e] net/smc: handle incoming CDC validation message

testing commit b286a0651e4404ab96cdfdcdad8a839a26b3751e with gcc (GCC) 8.4.1 20210217
kernel signature: 362a5eba288d0b16ba907f6799a025cf7f28ab7218cdf469fcdc5110c00c012a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip b286a0651e4404ab96cdfdcdad8a839a26b3751e
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[ac02a451a6148bb9c395b39783ce7299eddf4f31] net: dsa: sja1105: implement cross-chip bridging operations

testing commit ac02a451a6148bb9c395b39783ce7299eddf4f31 with gcc (GCC) 8.4.1 20210217
kernel signature: 3d1ebf68ca99f3d1b87061f6064848d64cab1a8aa074636a9c4302c59b9ae91e
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip ac02a451a6148bb9c395b39783ce7299eddf4f31
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[ac51d99bf81caac8d8881fe52098948110d0de68] bpf: Create anonymous bpf iterator

testing commit ac51d99bf81caac8d8881fe52098948110d0de68 with gcc (GCC) 8.4.1 20210217
kernel signature: 580280fa77b46a62764623fccae800672dab23f7d1b70b146ed053538c67b64f
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip ac51d99bf81caac8d8881fe52098948110d0de68
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[4f6cd04f2ded199931c44b3c95c4938618cd8b82] dsa: sja1105: fix semicolon.cocci warnings

testing commit 4f6cd04f2ded199931c44b3c95c4938618cd8b82 with gcc (GCC) 8.4.1 20210217
kernel signature: 90b2508be97a2417fb840c48c6e59dbe6ca07db3704607966c7bd4ee2db86c79
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 4f6cd04f2ded199931c44b3c95c4938618cd8b82
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[3ee7b7cd83900bb711efadbf16fa096a615a1566] Bluetooth: Add BT_MODE socket option

testing commit 3ee7b7cd83900bb711efadbf16fa096a615a1566 with gcc (GCC) 8.4.1 20210217
kernel signature: faec1843a4151569ad6e3819353661078e5291e5d07e52fedd4e2e4bd0429295
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 3ee7b7cd83900bb711efadbf16fa096a615a1566
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[ab1e0ce99d3dabc57e5a383b3ffc60fb97aafe9e] net/mlx5e: kTLS, Fill work queue edge separately in TX flow

testing commit ab1e0ce99d3dabc57e5a383b3ffc60fb97aafe9e with gcc (GCC) 8.4.1 20210217
kernel signature: 90b2508be97a2417fb840c48c6e59dbe6ca07db3704607966c7bd4ee2db86c79
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip ab1e0ce99d3dabc57e5a383b3ffc60fb97aafe9e
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[d2a3f5f4635b7b0df8d4cd04ee0c75886ef699b9] Bluetooth: Add HCI device identifier for VIRTIO devices

testing commit d2a3f5f4635b7b0df8d4cd04ee0c75886ef699b9 with gcc (GCC) 8.4.1 20210217
kernel signature: 91d5f54a24ac4176348b8e2b6f9d77addea2677d79fdcbc09241a8feaa935e3f
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip d2a3f5f4635b7b0df8d4cd04ee0c75886ef699b9
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[ec9cdca0663a543ede2072ff091beec1787e3374] net/mlx5e: Unify reserving space for WQEs

testing commit ec9cdca0663a543ede2072ff091beec1787e3374 with gcc (GCC) 8.4.1 20210217
kernel signature: d6857e143941c7036e9ff1cd6e8310dc9017cd7e0d1cf125049051a2f048a116
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip ec9cdca0663a543ede2072ff091beec1787e3374
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[c6f5f242f5ed58cc531e75507e8447a8c9b6cd30] net: phy: mdio-bcm-iproc: Do not show kernel pointer

testing commit c6f5f242f5ed58cc531e75507e8447a8c9b6cd30 with gcc (GCC) 8.4.1 20210217
kernel signature: 37b831503ef64ecf679b01d7ee839ae524813e002b4e795430fe9a6772a89553
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip c6f5f242f5ed58cc531e75507e8447a8c9b6cd30
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[14366da6b59203ef5fc3cf21660113b60c2f1421] mlxsw: spectrum_span: Wrap buffer change in a function

testing commit 14366da6b59203ef5fc3cf21660113b60c2f1421 with gcc (GCC) 8.4.1 20210217
kernel signature: a148eb0b7093ba5cfca02ef633322fd5873967f5b55dc8136b4b2cd861485356
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 14366da6b59203ef5fc3cf21660113b60c2f1421
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[c13a83b01010c94ad7fe68161fd4dae3767d3ffe] rtlwifi: rtl8192ee: use true,false for bool variables

testing commit c13a83b01010c94ad7fe68161fd4dae3767d3ffe with gcc (GCC) 8.4.1 20210217
kernel signature: fa7ea42c51701a1b56f4a86ba5944c97e2c4a9ca6cdf0833990dc14ee8c9db24
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip c13a83b01010c94ad7fe68161fd4dae3767d3ffe
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[81496b72e9ba1999d4ed7bb7fa407a1edef020a4] r8169: add check for invalid parameter combination in rtl_set_coalesce

testing commit 81496b72e9ba1999d4ed7bb7fa407a1edef020a4 with gcc (GCC) 8.4.1 20210217
kernel signature: f349cf01492554c17fdc9fee5de53c76efde4ad61602edb421a3ca709b5f2e2e
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 81496b72e9ba1999d4ed7bb7fa407a1edef020a4
Bisecting: 799 revisions left to test after this (roughly 10 steps)
[85325c24d5d2c8fcde35a634742d14d45bf7326e] dt-bindings: ath10k: Add wifi-firmware subnode for wifi node

revisions tested: 32, total time: 8h0m55.656170899s (build: 3h19m54.238021365s, test: 4h38m5.209949766s)
error: bisection is taking too long (>8h0m0s), aborting