WARNING: can't dereference registers at ADDR for ip apic_timer_interrupt

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 1bab61d3 Linux 4.19.124
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=128d067e100000
kernel config: https://syzkaller.appspot.com/x/.config?x=e95e3ce854b90b1b
dashboard link: https://syzkaller.appspot.com/bug?extid=66d8f8fd6102a1045232
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+66d8f8...@syzkaller.appspotmail.com

WARNING: can't dereference registers at 000000004ae18ce8 for ip apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
nla_parse: 5 callbacks suppressed
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.4'.
nla_parse: 4 callbacks suppressed
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor.4'.


---
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[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 1bab61d3 Linux 4.19.124
git tree: linux-4.19.y

console output: https://syzkaller.appspot.com/x/log.txt?x=144d5d6e100000

kernel config: https://syzkaller.appspot.com/x/.config?x=e95e3ce854b90b1b
dashboard link: https://syzkaller.appspot.com/bug?extid=66d8f8fd6102a1045232
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=137cc09a100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1119ece2100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+66d8f8...@syzkaller.appspotmail.com

WARNING: can't dereference registers at 000000001d5aabd1 for ip apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894