This is due to using gcc-10.2. Building with gcc-9 is fine. This
compiler support for GCOV will be disabled, see
https://lkml.org/lkml/2020/9/2/934
So, marking this as Won't Fix because there is a workaround and 10.2 is
not looking favourably for GCOV support at the moment.
** Changed in: linux (Ubuntu)
Status: In Progress => Won't Fix
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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:
Won't Fix
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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