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Subject[CRASH] crypto: virtio: crash when modprobing tcrypt on 5.5-rc7 / next-20200122
Hello

When modprobing tcrypt on qemu 4.1.0 I get a kernel panic on 5.5-rc7 and next-20200122
qemu is started by:
/usr/bin/qemu-system-x86_64 -cpu host -enable-kvm -nographic -net nic,model=e1000,macaddr=52:54:00:12:34:58 -net tap -m 512 -monitor none -object cryptodev-backend-builtin,id=cryptodev0 -device virtio-crypto-pci,id=crypto0,cryptodev=cryptodev0 -append 'console=ttyS0 root=/dev/ram0 ip=dhcp' -kernel /var/lib/lava/dispatcher/tmp/41332/deployimages-td18675m/kernel/bzImage -initrd /var/lib/lava/dispatcher/tmp/41332/deployimages-td18675m/ramdisk/rootfs.cpio.gz -drive format=qcow2,file=/var/lib/lava/dispatcher/tmp/41332/apply-overlay-guest-icy4k1ol/lava-guest.qcow2,media=disk,if=ide,id=lavatest

[ 112.771925] general protection fault: 0000 [#1] SMP PTI
[ 112.772686] CPU: 0 PID: 126 Comm: virtio0-engine Not tainted 5.5.0-rc7+ #1
[ 112.773576] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190711_202441-buildvm-armv7-10.arm.fedoraproject.org-2.fc31 04/01/2014
[ 112.775319] RIP: 0010:sg_next+0x0/0x20
[ 112.775821] Code: cc cc cc cc cc cc cc cc cc cc c7 47 10 00 00 00 00 89 57 0c 48 89 37 89 4f 08 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <f6> 07 02 75 17 48 8b 57 20 48 8d 47 20 48 89 d1 48 83 e1 fc 83 e2
[ 112.778330] RSP: 0018:ffffa92440237d90 EFLAGS: 00010006
[ 112.779071] RAX: fefefefe00000000 RBX: 000000000000000a RCX: fefefefe00000000
[ 112.780081] RDX: 0000000000000001 RSI: ffff9b19da1a2180 RDI: fefefefe00000000
[ 112.781081] RBP: ffff9b19da1a2198 R08: ffff9b19dfb24ee8 R09: 0000000000000a20
[ 112.782079] R10: ffff9b19da125010 R11: 0000000000000000 R12: ffff9b19da1a21b8
[ 112.783079] R13: 0000000000000003 R14: ffff9b19da1a2180 R15: 0000000000000004
[ 112.784077] FS: 0000000000000000(0000) GS:ffff9b19de400000(0000) knlGS:0000000000000000
[ 112.785202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 112.786030] CR2: 00007f18a157b050 CR3: 000000001040a004 CR4: 0000000000060ef0
[ 112.787034] Call Trace:
[ 112.787393] virtqueue_add_sgs+0x4c/0x90
[ 112.787998] virtio_crypto_skcipher_crypt_req+0x310/0x3e0
[ 112.788817] crypto_pump_work+0x10c/0x240
[ 112.789420] ? __kthread_init_worker+0x50/0x50
[ 112.790082] kthread_worker_fn+0x89/0x180
[ 112.790690] kthread+0x10e/0x130
[ 112.791182] ? kthread_park+0x80/0x80
[ 112.791736] ret_from_fork+0x35/0x40
[ 112.792282] Modules linked in: cts lzo salsa20_generic camellia_x86_64 camellia_generic fcrypt pcbc tgr192 anubis wp512 khazad tea michael_mic arc4 cast6_generic cast5_generic cast_common deflate sha512_ssse3 sha512_generic cfb ofb serpent_sse2_x86_64 serpent_generic lrw twofish_x86_64_3way twofish_x86_64 crypto_simd cryptd glue_helper twofish_generic twofish_common blowfish_x86_64 blowfish_generic blowfish_common md4 tcrypt(+)
[ 112.797652] ---[ end trace 4a8142d4a08c2518 ]---
[ 112.798320] RIP: 0010:sg_next+0x0/0x20
[ 112.798865] Code: cc cc cc cc cc cc cc cc cc cc c7 47 10 00 00 00 00 89 57 0c 48 89 37 89 4f 08 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <f6> 07 02 75 17 48 8b 57 20 48 8d 47 20 48 89 d1 48 83 e1 fc 83 e2
[ 112.801452] RSP: 0018:ffffa92440237d90 EFLAGS: 00010006
[ 112.802189] RAX: fefefefe00000000 RBX: 000000000000000a RCX: fefefefe00000000
[ 112.803190] RDX: 0000000000000001 RSI: ffff9b19da1a2180 RDI: fefefefe00000000
[ 112.804192] RBP: ffff9b19da1a2198 R08: ffff9b19dfb24ee8 R09: 0000000000000a20
[ 112.805201] R10: ffff9b19da125010 R11: 0000000000000000 R12: ffff9b19da1a21b8
[ 112.806195] R13: 0000000000000003 R14: ffff9b19da1a2180 R15: 0000000000000004
[ 112.807222] FS: 0000000000000000(0000) GS:ffff9b19de400000(0000) knlGS:0000000000000000
[ 112.808352] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 112.809169] CR2: 00007f18a157b050 CR3: 000000001040a004 CR4: 0000000000060ef0

I have tested also 5.4.14
and I got random freeze with:
qemu-system-x86_64: virtio: zero sized buffers are not allowed

Regards

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