bisecting cause commit starting from 8653b778e454a7708847aeafe689bce07aeeb94e
building syzkaller on 04201c0669446145fd9c347c5538da0ca13ff29b
testing commit 8653b778e454a7708847aeafe689bce07aeeb94e with gcc (GCC) 8.1.0
kernel signature: dd0c02e544d29659ae165f46b7ea438b01ab6f141568b0818f0df08b77ecba2e
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 8.1.0
kernel signature: f5760b2c445d15f5ece92b856df5a49be8c93d3d22f6cda3cb5ed85afe8f4ee1
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
testing release v5.9
testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 8.1.0
kernel signature: 48a44b356059ba46606be11d05f4af2fd4977ae6064a111f191a24ab366037c1
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0
kernel signature: 22aa95b7e7e6aea83bcbde6ee96bb510036c390ecb1edc1d673d8134021fdfef
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: f5d9faac2087b090050e744a65f37f315c08f987da9cd1b89f915d62396835a7
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: c44a15efe9f4dddfd3265e3ee72039e8fedc8e1a971752bf1b7899bdd24b69bf
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) 8.1.0
kernel signature: 8357c792eabefc3400dc99b74ce05f8804279bcfb0b2a00d4cd349e4623cd9bc
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) 8.1.0
kernel signature: 5585503bed3899cf9501fee1dabbde5e3a5bb854c4af3a05e4b7dd31e23d8199
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 with gcc (GCC) 8.1.0
kernel signature: d9adf702fa58b2819b7a50f109211d29d8d71a3d2268c284272efbbaef7b6294
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: 2c65c444400e6b20e636dcc8ed8c70f612ff65a5d89ed35ff87965d22f845baa
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
# 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 with gcc (GCC) 8.1.0
kernel signature: 46032ae5a9ba3bfa71790987e84c399cb9d237684f7805e17952700502931fea
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: c38f27e92e07aac7232a9fb82adb69e829a14856fb89fab7dbc2a43806c60ae9
all runs: 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 with gcc (GCC) 8.1.0
kernel signature: 4c96d68cf8cfd6886625c1e127b60711ef4694ad83adfeb6843e60fc72667741
all runs: crashed: UBSAN: shift-out-of-bounds in snd_usbmidi_get_ms_info
# 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 with gcc (GCC) 8.1.0
kernel signature: 624992aa86fa194eefd5b7fcb65b5b58603a161857de032dc6a9affd7a719f6a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: d29928d0913436e4e79125000886ba6330e190fbcb3a2df2bf2b5585fa84cffe
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: 87754a2c280dd0695dd7c50640de147c38d2948c095abbba661b72468733233a
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 with gcc (GCC) 8.1.0
kernel signature: 88879c19c6b016a2c5fbdf78d38d707f6152e52b699d5c8cdaf8bf7a43366f3a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: a5362d16484ce4f35a45ed81add46a428a1608e8bea842b1777826fc81a08d97
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 with gcc (GCC) 8.1.0
kernel signature: b06af8306ff5f05afb5c93f65ea351648e35336559287b8b2549989aa9390dd7
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 with gcc (GCC) 8.1.0
kernel signature: d29df72e7eba9a64e13e3bd87d88b1fca46b90187848bfab2551463ddd12e607
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 with gcc (GCC) 8.1.0
kernel signature: 334064f86b4c23bbac37a2424bf5c7e2f532bf6dc5681ab7ac70b28ef8c1706a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: 34fb247b7808f7ecba7547fde824a8f64301b803cdc1ca911ee89c03b307a961
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 with gcc (GCC) 8.1.0
kernel signature: 1e852f0654c1a6caacb887913ce50aa29b2c2aec3c98ea3f4ddc29c414e782c2
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 with gcc (GCC) 8.1.0
kernel signature: cb862360cd23cdd67cd0fed2e62dbed40c413244c691852a14154101a75ad2ca
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# 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 with gcc (GCC) 8.1.0
kernel signature: 4b8154f5589b04d31cadfd00e4fe79eb8413345d5683244b46e53a9e3a926d90
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 with gcc (GCC) 8.1.0
kernel signature: 26a8d8a54dc5200039c106deda3b46e9bfd721c30182625f5d59db6d48f60bf4
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

testing commit a3434a497a2f33324e0f47bc1500a400959b4b25 with gcc (GCC) 8.1.0
kernel signature: 66c1abbe39a1727da74e8d2ec591a2ccb9a98a1eb6441734d18cba6ea5ccf6fe
all runs: OK
# git bisect good a3434a497a2f33324e0f47bc1500a400959b4b25
Bisecting: 5316 revisions left to test after this (roughly 12 steps)
[0be44352071dc87a4f9bf879642b1d44876971d9] KVM: x86/mmu: Reuse the current root if possible for fast switch

testing commit 0be44352071dc87a4f9bf879642b1d44876971d9 with gcc (GCC) 8.1.0
kernel signature: 9a30d9aaf439201b99d738ce1626b572510a251ec941261fbdafbe30156fc2c0
all runs: OK
# git bisect good 0be44352071dc87a4f9bf879642b1d44876971d9
Bisecting: 5279 revisions left to test after this (roughly 12 steps)
[5c8db3eb381745c010ba746373a279e92502bdc8] Merge branch 'i2c/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

testing commit 5c8db3eb381745c010ba746373a279e92502bdc8 with gcc (GCC) 8.1.0
kernel signature: 64a68cceffc137b1b17ddf639b0ebaaef492a97437c37bd47367bbb4f5e8c1b1
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 5c8db3eb381745c010ba746373a279e92502bdc8
Bisecting: 5279 revisions left to test after this (roughly 12 steps)
[4ed59504fbfbf3f9ceb957bc3a309bfd85f6cea3] net: ethernet: ti: ale: am65: add support for default thread cfg

testing commit 4ed59504fbfbf3f9ceb957bc3a309bfd85f6cea3 with gcc (GCC) 8.1.0
kernel signature: 7c775410cf9a5a4d20ca0aa7c5e9e1ff940bae1d93c1611f8ed7229b6727996b
all runs: OK
# git bisect good 4ed59504fbfbf3f9ceb957bc3a309bfd85f6cea3
Bisecting: 5081 revisions left to test after this (roughly 12 steps)
[e109f506074152b7241bcbd3949a099e776cb802] Merge tag 'mtd/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

testing commit e109f506074152b7241bcbd3949a099e776cb802 with gcc (GCC) 8.1.0
kernel signature: b01d591aabd84d95c575da49cf8c8cc47cfe13e1f0ae8dfaa3a140fb8a0f605a
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip e109f506074152b7241bcbd3949a099e776cb802
Bisecting: 5081 revisions left to test after this (roughly 12 steps)
[a5fb8b918920c6f7706a8b5b8ea535a7f077a7f6] drm/msm/a6xx: Use the DMA API for GMU memory objects

testing commit a5fb8b918920c6f7706a8b5b8ea535a7f077a7f6 with gcc (GCC) 8.1.0
kernel signature: 80aded5643596817875b64d869d2a8f3a7090791532d58ecf380ca9d85427178
all runs: OK
# git bisect good a5fb8b918920c6f7706a8b5b8ea535a7f077a7f6
Bisecting: 5081 revisions left to test after this (roughly 12 steps)
[7289fdb5dcdbc5155b5531529c44105868a762f2] KVM: Remove CREATE_IRQCHIP/SET_PIT2 race

testing commit 7289fdb5dcdbc5155b5531529c44105868a762f2 with gcc (GCC) 8.1.0
kernel signature: 75a6a6f0baa6e3cf83b878160d47b3a7c2fd264f5a73c59ff421784d7c80ee21
all runs: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(8,1)
# git bisect skip 7289fdb5dcdbc5155b5531529c44105868a762f2
Bisecting: 5081 revisions left to test after this (roughly 12 steps)
[cf7e44daa727bf4868a4b3be380829db52a2762d] staging: qlge: add braces on all arms of if-else

revisions tested: 33, total time: 8h5m30.146721495s (build: 3h19m25.965501652s, test: 4h41m56.053938809s)
error: bisection is taking too long (>8h0m0s), aborting