[Bug 1185831] Kernel 5.12 built with gcc11 pagefaults at boot

https://bugzilla.suse.com/show_bug.cgi?id=1185831 https://bugzilla.suse.com/show_bug.cgi?id=1185831#c5 --- Comment #5 from Jiri Slaby --- Quite interestingly, I can reproduce with kernel-obs-build from Staging:N: $ qemu-kvm -kernel .build.kernel.kvm -initrd .build.initrd.kvm -hda /dev/null -m 2G -append 'console=ttyS0' -serial stdio

... [ 2.599705] BUG: unable to handle page fault for address: ffffffffc05ded30 [ 2.601018] #PF: supervisor write access in kernel mode [ 2.601784] #PF: error_code(0x0003) - permissions violation [ 2.602632] PGD 25a15067 P4D 25a15067 PUD 25a17067 PMD 480b067 PTE 8000000005504061 [ 2.603855] Oops: 0003 [#1] SMP PTI [ 2.604387] CPU: 0 PID: 210 Comm: modprobe Not tainted 5.12.0-6-default #1 openSUSE Tumbleweed [ 2.605788] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014 [ 2.607707] RIP: 0010:register_trace_event+0xcc/0x210 ... [ 2.626808] Call Trace: [ 2.627388] trace_event_raw_init+0x9/0x20 [ 2.628055] event_init+0x2d/0x70 [ 2.628716] trace_module_notify+0x108/0x1f0 [ 2.629637] blocking_notifier_call_chain_robust+0x64/0xd0 [ 2.631256] ? mutex_lock+0xe/0x30 [ 2.631895] load_module+0x20e4/0x2910 ... [ 2.651413] Modules linked in: xfs(+) btrfs blake2b_generic xor raid6_pq libcrc32c reiserfs squashfs fuse dm_snapshot dm_bufio essiv authenc dm_crypt trusted dm_mod binfmt_misc loop sg

Note it dies during load of xfs module. But I cannot repro with a kernel built outside OBS: factory:~ # dmesg|head -1

[ 0.000000] Linux version 5.12.2-default (jslaby@kunlun) (gcc-11 (SUSE Linux) 11.1.1 20210429 [revision cd0a059bd384da58d43674496a79ecb7de610800], GNU ld (GNU Binutils; devel:gcc / openSUSE_Leap_15.1) 2.36.0.20210204-lp151.403) #8 SMP Tue May 11 08:07:05 CEST 2021 factory:~ # lsmod|grep xfs xfs 1753088 0 libcrc32c 16384 1 xfs

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