bisecting cause commit starting from 5a5d008887b47f4d6ad98ff4b841313f892fcdee
building syzkaller on 8cac236e8c3741446e540b2fe0702086a4ae4c17
testing commit 5a5d008887b47f4d6ad98ff4b841313f892fcdee
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: a95a813750ebec752649121088113e5b427ee99d0e4406e13a574feb83034c5b
all runs: crashed: INFO: rcu detected stall in io_uring_enter
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: crashed: INFO: task hung in io_ring_exit_work
testing release v5.13
testing commit 62fb9874f5da54fdb243003b386128037319b219
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: f0d89eb8f9d4c9864735171e2eb3e5feeaf7d26439e5a7bae1ef45fb8f9578ab
all runs: crashed: INFO: task hung in io_ring_exit_work
testing release v5.12
testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: f3685dd148c0d7f62ec2c26b6ccd338a86cdce80e434ce6a225cc94922f0c2db
all runs: crashed: INFO: task hung in io_ring_exit_work
testing release v5.11
testing commit f40ddce88593482919761f74910f42f4b84c004b
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 1f5c2551444cc5a9717d44acd7d59dea64de831f0ec6d140c76c393b1a8be7b9
all runs: crashed: no output from test machine
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 6fadf1b92bad0f2eefaa047034d1044e5b34f9c1872d7811646aed5049f137a7
all runs: 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) 2.35.2
kernel signature: 79f11e7a8eed3e447672927cef5561c2ba920551ad72927757519c7fec1a8d58
all runs: crashed: no output from test machine
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c
compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 3a10be75bbfb45817efdf085ef0d7bb7934a9655779dbb5140e82be0f1d7e80e
all runs: crashed: no output from test machine
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162
compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 6c15458155203600f9eead46349048b82bfa958d35a9c08152de83a646393e6d
all runs: crashed: no output from test machine
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 3ec8f747eafa1b5378a4cc37ea09f1a8798bfd8f4ee7c3e4b1f24c42b3888ba2
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
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a2b5f661133618c32c37d198d7557ee3c7e3e30469c446f7ba2067f52419afce
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# 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
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: e9c9680ccef02ee0955a9f2f7caa32a0b0a3337e5081c1b0c9b5256eae1cc45a
all runs: OK
# git bisect good 422c032afcf57d5e8109a54912e22ffc53d99068
Bisecting: 6728 revisions left to test after this (roughly 13 steps)
[8c1b724ddb218f221612d4c649bc9c7819d8d7a6] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

testing commit 8c1b724ddb218f221612d4c649bc9c7819d8d7a6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: ac3b7906667feb37145fe6868f1c6d4642b258b884ef1b21bc8678bd5bf17c66
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 8c1b724ddb218f221612d4c649bc9c7819d8d7a6
Bisecting: 6728 revisions left to test after this (roughly 13 steps)
[88d7fcfa3b1fe670f0412b95be785aafca63352b] net: inet_csk: Fix so_reuseport bind-address cache in tb->fast*

testing commit 88d7fcfa3b1fe670f0412b95be785aafca63352b
compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 020d92d555a1685b3969ccafc122bae56394c5096b7db62724f308ce9385dff6
all runs: crashed: no output from test machine
# git bisect bad 88d7fcfa3b1fe670f0412b95be785aafca63352b
Bisecting: 6383 revisions left to test after this (roughly 13 steps)
[6cad420cc695867b4ca710bac21fde21a4102e4b] Merge branch 'akpm' (patches from Andrew)

testing commit 6cad420cc695867b4ca710bac21fde21a4102e4b
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c5aa9785917c44299e002d3238fd7f0966a0ff191873c145c68f599efe355d6a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 6cad420cc695867b4ca710bac21fde21a4102e4b
Bisecting: 6383 revisions left to test after this (roughly 13 steps)
[77a36a3ab4ff17fad23831192e3694a3c5a1750d] HID: Add driver fixing Glorious PC Gaming Race mouse report descriptor

testing commit 77a36a3ab4ff17fad23831192e3694a3c5a1750d
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: efc6afdf0ea968f11b7538a4bd15103094a27895a3cf8e14549cc828e1d7730a
run #0: boot failed: can't ssh into the instance
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 77a36a3ab4ff17fad23831192e3694a3c5a1750d
Bisecting: 6383 revisions left to test after this (roughly 13 steps)
[8ec91c0fce1500306a858d0c35d1383fd9eb6ba6] Merge tag 'gpio-v5.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

testing commit 8ec91c0fce1500306a858d0c35d1383fd9eb6ba6
compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 051986672bb263864b8607a609c1e12d593cfd5f40b983cf676ab8bd1fe23dfb
all runs: crashed: no output from test machine
# git bisect bad 8ec91c0fce1500306a858d0c35d1383fd9eb6ba6
Bisecting: 6337 revisions left to test after this (roughly 13 steps)
[7be97138e7276c71cc9ad1752dcb502d28f4400d] Merge tag 'xfs-5.7-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

testing commit 7be97138e7276c71cc9ad1752dcb502d28f4400d
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: daeee3585d177cd1827d8eea37f93dcf965ce7ac2092ca67e021936372576ea2
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 7be97138e7276c71cc9ad1752dcb502d28f4400d
Bisecting: 6337 revisions left to test after this (roughly 13 steps)
[f5637d3b42ab0465ef71d5fb8461bce97fba95e8] mm/memory_hotplug: rename mhp_restrictions to mhp_params

testing commit f5637d3b42ab0465ef71d5fb8461bce97fba95e8
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 44f86b666457fde89f3e10ba26e53bf413c49d1e3914e89cd63fb65d61170175
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip f5637d3b42ab0465ef71d5fb8461bce97fba95e8
Bisecting: 6337 revisions left to test after this (roughly 13 steps)
[1592c4b9935fa8a3b7c297955bb872a357e5a3b6] pinctrl: sprd: Add pin high impedance mode support

testing commit 1592c4b9935fa8a3b7c297955bb872a357e5a3b6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: f701136a915d3461a089df11cc6ce58a5945abf4f0adc5ea0ce5aac962386aa2
all runs: OK
# git bisect good 1592c4b9935fa8a3b7c297955bb872a357e5a3b6
Bisecting: 6274 revisions left to test after this (roughly 13 steps)
[763dafc520add02a1f4639b500c509acc0ea8e5b] audit: check the length of userspace generated audit records

testing commit 763dafc520add02a1f4639b500c509acc0ea8e5b
compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 6773556b9105749e54cfbc54da33fa55827d37d829c15f001d0b071d82fe9732
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 763dafc520add02a1f4639b500c509acc0ea8e5b
Bisecting: 6274 revisions left to test after this (roughly 13 steps)
[377f16ac67237c8cda05daf363bcbea95212b000] xfs: factor out a xfs_attr_match helper

testing commit 377f16ac67237c8cda05daf363bcbea95212b000
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: f167a34b9534ce7877ece9e1f8d7f50e8b3a63e44f087947d3d6256985d1bd91
all runs: OK
# git bisect good 377f16ac67237c8cda05daf363bcbea95212b000
Bisecting: 6274 revisions left to test after this (roughly 13 steps)
[a72d2401f54b7db41c77ab971238a06eafe929fb] gfs2: Allow some glocks to be used during withdraw

testing commit a72d2401f54b7db41c77ab971238a06eafe929fb
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 26bea2eb78a41bac58bb97c4c3cffa4d3162b443f5093222b5e55daf523a31fa
all runs: OK
# git bisect good a72d2401f54b7db41c77ab971238a06eafe929fb
Bisecting: 6274 revisions left to test after this (roughly 13 steps)
[5fc0df93fccd4dc8412bfc488ba4ba8268aa12dc] Merge v5.6 into drm-next

testing commit 5fc0df93fccd4dc8412bfc488ba4ba8268aa12dc
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c7df85cc11148789e420b0a5b2fa23c4d4b6b11e4d08d4f1c592f6adf346bac1
all runs: OK
# git bisect good 5fc0df93fccd4dc8412bfc488ba4ba8268aa12dc
Bisecting: 5319 revisions left to test after this (roughly 13 steps)
[848960e576dafc8ed54c691b2f70b92e1fdea9ba] Merge tag 'sound-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

testing commit 848960e576dafc8ed54c691b2f70b92e1fdea9ba
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 16f96c11350ac9c5d2ba29d180132bfdedb29b09587180e613e28be02f42d70e
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 848960e576dafc8ed54c691b2f70b92e1fdea9ba
Bisecting: 5319 revisions left to test after this (roughly 13 steps)
[2f5ab6225fa2bd1435a65e9a2c5503e5b5cf4b45] Merge tag 'docs-5.6-fixes' into docs-next

testing commit 2f5ab6225fa2bd1435a65e9a2c5503e5b5cf4b45
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c2bcf1dac8d00f3cfc775cdf99454e1c74d5b2b3f726d8ce71dc5ec54b43d7b0
all runs: OK
# git bisect good 2f5ab6225fa2bd1435a65e9a2c5503e5b5cf4b45
Bisecting: 5319 revisions left to test after this (roughly 13 steps)
[0830c0a4891f9de009dfaa585dfecefa4c67795b] Bluetooth: hci_h5: Move variable into local scope

testing commit 0830c0a4891f9de009dfaa585dfecefa4c67795b
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: bfeac212ec859638dc305812de0db84b6e800903ac1cfcb96d803a927b3ddefc
all runs: OK
# git bisect good 0830c0a4891f9de009dfaa585dfecefa4c67795b
Bisecting: 5319 revisions left to test after this (roughly 13 steps)
[7f218319caaaf6f2a43b22d8c82b898f32b4ec70] Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity

testing commit 7f218319caaaf6f2a43b22d8c82b898f32b4ec70
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: bbe9a35f00eba1bdebbe520fffc23133f64655d676c53b3786f52dd04108f19c
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
# git bisect skip 7f218319caaaf6f2a43b22d8c82b898f32b4ec70
Bisecting: 5319 revisions left to test after this (roughly 13 steps)
[ec06dc15c358d3f41e9fd05872d772ed0f9fa32a] ASoC: dapm: select sleep_state when initializing PINCTRL widget

testing commit ec06dc15c358d3f41e9fd05872d772ed0f9fa32a
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 359f4ac8869e537ceb17bf65b5535b8dea390472c34efc09b54b699781e0c937
all runs: OK
# git bisect good ec06dc15c358d3f41e9fd05872d772ed0f9fa32a
Bisecting: 5319 revisions left to test after this (roughly 12 steps)
[d84edddc447df2d87e6ce9fbf94d95225504ab32] iommu/omap: Fix -Woverflow warnings when compiling on 64-bit architectures

testing commit d84edddc447df2d87e6ce9fbf94d95225504ab32
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a9ecf14f38ab76c87132366b76fa2aaeb964475c8c127770cfd866de1ed63995
all runs: OK
# git bisect good d84edddc447df2d87e6ce9fbf94d95225504ab32
Bisecting: 5316 revisions left to test after this (roughly 12 steps)
[a3434a497a2f33324e0f47bc1500a400959b4b25] ASoC: jz4740-i2s: Add support for the JZ4770

revisions tested: 30, total time: 8h7m16.125690286s (build: 3h10m34.244001961s, test: 4h52m36.784788086s)
error: bisection is taking too long (>8h0m0s), aborting