Upstream fix 40249c6962075c040fd071339acae524f18bfac9, this has already
been picked up by Sash Levin for 5.8, 5.4, 4.19, 4.14, 4.9 and 4.8 on
backport stable AUTOSEL. Lets wait for that fix to trickle into the SRU
process.
** Changed in: linux (Ubuntu)
Status: Won't Fix => In Progress
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https://bugs.launchpad.net/bugs/1891288
Title:
arm64 gcov in 5.8 breaks when trying to enable it
Status in Linux:
Confirmed
Status in linux package in Ubuntu:
In Progress
Bug description:
Running:
sudo lcov --zerocounters on a gcov enabled kernel causes a read-only
splat:
[ 139.798968] Unable to handle kernel write to read-only memory at virtual
address ffffb4511ee6bb10
[ 139.803325] Mem abort info:
[ 139.804882] ESR = 0x9600004e
[ 139.806265] EC = 0x25: DABT (current EL), IL = 32 bits
[ 139.811261] SET = 0, FnV = 0
[ 139.814163] EA = 0, S1PTW = 0
[ 139.816545] Data abort info:
[ 139.817852] ISV = 0, ISS = 0x0000004e
[ 139.820023] CM = 0, WnR = 1
[ 139.821350] swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000005086f000
[ 139.825005] [ffffb4511ee6bb10] pgd=00000001b6fff003, p4d=00000001b6fff003,
pud=00000001b6ffe003, pmd=004000004e200f91
[ 139.832061] Internal error: Oops: 9600004e [#1] SMP
[ 139.835002] Modules linked in: nls_iso8859_1 dm_multipath scsi_dh_rdac
scsi_dh_emc scsi_dh_alua efi_pstore qemu_fw_cfg sch_fq_codel drm virtio_rng ip_t
ables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c rai
d1 raid0 multipath linear crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce
virtio_net net_failover xhci_pci virtio_blk virtio_scsi failover xhci_pci_ren
esas aes_neon_bs aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher
[ 139.865929] CPU: 5 PID: 1235 Comm: lcov Tainted: G W
5.8.0-8-generic #9
[ 139.871293] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[ 139.876248] pstate: 20400005 (nzCv daif +PAN -UAO BTYPE=--)
[ 139.879993] pc : __memset+0x148/0x188
[ 139.882387] lr : gcov_info_reset+0xa0/0x110
[ 139.885404] sp : ffff8000122f3bf0
[ 139.887730] x29: ffff8000122f3bf0 x28: ffff000167480f40
[ 139.891129] x27: 0000000000000000 x26: ffffb450e46bc060
[ 139.894688] x25: 0000000000000001 x24: ffffb450e46bc040
[ 139.897391] x23: 0000000000000000 x22: ffffb450e46bc0a8
[ 139.900064] x21: ffffb45122ba5db8 x20: ffffb450e46bc068
[ 139.902681] x19: ffffb450e46bc068 x18: 0000000000000000
[ 139.905345] x17: 0000000000000000 x16: 0000000000000000
[ 139.908016] x15: 0000000000000000 x14: 0000000000000000
[ 139.910625] x13: 0000000000000000 x12: 0000000000000000
[ 139.913260] x11: 0000000000000000 x10: 0000000000000000
[ 139.915922] x9 : 0000000000000000 x8 : ffffb4511ee6bb10
[ 139.918531] x7 : 0000000000000000 x6 : 000000000000003f
[ 139.921196] x5 : 0000000000000040 x4 : 0000000000000030
[ 139.923852] x3 : 00000007235d7fd0 x2 : 00000007235d7fd0
[ 139.926460] x1 : 0000000000000000 x0 : ffffb4511ee6bb10
[ 139.929126] Call trace:
[ 139.930349] __memset+0x148/0x188
[ 139.932025] reset_node+0x70/0xc0
[ 139.933662] reset_write+0xc0/0x130
[ 139.935389] full_proxy_write+0x98/0x110
[ 139.937349] vfs_write+0x18c/0x3e0
[ 139.939031] ksys_write+0xc4/0x1f0
[ 139.940766] __arm64_sys_write+0x44/0x60
[ 139.942705] invoke_syscall+0x74/0x150
[ 139.944601] el0_svc_common.constprop.0+0x94/0x264
[ 139.946961] do_el0_svc+0x5c/0x7c
[ 139.948651] el0_svc+0x70/0x114
[ 139.950206] el0_sync_handler+0x140/0x39c
[ 139.952239] el0_sync+0x17c/0x180
[ 139.953894] Code: f101007f fa45a068 54fffc0b aa0303e2 (a9001d07)
[ 139.956946] ---[ end trace 71e2f9cc3eaddf4e ]---
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