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BUG: KASAN: vmalloc-out-of-bounds in __read_once_size include/linux/compiler.h:232 [inline]
BUG: KASAN: vmalloc-out-of-bounds in rcu_seq_current kernel/rcu/rcu.h:99 [inline]
BUG: KASAN: vmalloc-out-of-bounds in srcu_invoke_callbacks+0x304/0x320 kernel/rcu/srcutree.c:1172
Read of size 8 at addr ffffc900041c4c80 by task kworker/1:1/9703

CPU: 1 PID: 9703 Comm: kworker/1:1 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rcu_gp srcu_invoke_callbacks
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x315 mm/kasan/report.c:374
 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:618
 __read_once_size include/linux/compiler.h:232 [inline]
 rcu_seq_current kernel/rcu/rcu.h:99 [inline]
 srcu_invoke_callbacks+0x304/0x320 kernel/rcu/srcutree.c:1172
 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266
 worker_thread+0x96/0xe20 kernel/workqueue.c:2412
 kthread+0x357/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352


Memory state around the buggy address:
 ffffc900041c4b80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffc900041c4c00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
>ffffc900041c4c80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                   ^
 ffffc900041c4d00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffc900041c4d80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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