On Mon, Nov 19, 2018 at 01:39:02PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: bae4e109837b mlxsw: spectrum: Expose discard counters via .. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11b5e77b400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d86f24333880b605 > dashboard link: https://syzkaller.appspot.com/bug?extid=999bca54de2ee169c021 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b7d093400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1487a225400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+999bca54de2ee169c...@syzkaller.appspotmail.com > > IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready > IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready > 8021q: adding VLAN 0 to HW filter on device team0 > ================================================================== > kasan: CONFIG_KASAN_INLINE enabled > BUG: KASAN: use-after-free in tick_sched_handle+0x16c/0x180 > kernel/time/tick-sched.c:164
So tick_sched_timer() -> tick_sched_handle() is passed regs returned by get_irq_regs() that seem to be junk. Those regs should come from smp_apic_timer_interrupt(). Thoughts?
