INFO: task syz-executor.5:25465 can't die for more than 143 seconds.
task:syz-executor.5  state:R  running task     stack:25032 pid:25465 ppid:  8593 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4325 [inline]
 __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5338
 irqentry_exit_cond_resched kernel/entry/common.c:393 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:385 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:423
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline]
RIP: 0010:lock_acquire+0x2c7/0x750 kernel/locking/lockdep.c:5402
Code: 48 c7 c7 80 96 6b 89 48 83 c4 20 e8 d3 2a bd 07 b8 ff ff ff ff 65 0f c1 05 c6 39 aa 7e 83 f8 01 0f 85 40 03 00 00 ff 34 24 9d <e9> 3a fe ff ff 65 ff 05 2d 28 aa 7e 48 8b 05 e6 9d 11 0c e8 f1 1f
RSP: 0000:0000000000000000 EFLAGS: 1ffff1100596d7f0 ORIG_RAX: 0000000000000000
RAX: 0000000000000001 RBX: 1ffff92002e8cefb RCX: 0000000000000001
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs.cold+0xa8/0x508 arch/x86/kernel/process_64.c:82
Read of size 8 at addr ffffc90017467788 by task khungtaskd/1650

CPU: 0 PID: 1650 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 __show_regs.cold+0xa8/0x508 arch/x86/kernel/process_64.c:82
 show_trace_log_lvl+0x2a7/0x2fd arch/x86/kernel/dumpstack.c:298
 sched_show_task kernel/sched/core.c:7006 [inline]
 sched_show_task+0x470/0x5c0 kernel/sched/core.c:6980
 check_killed_task kernel/hung_task.c:183 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:241 [inline]
 watchdog.cold+0xd8/0x31d kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


Memory state around the buggy address:
 ffffc90017467680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90017467700: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
>ffffc90017467780: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffffc90017467800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90017467880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================