INFO: task syz-executor.2:20408 can't die for more than 143 seconds.
task:syz-executor.2  state:R  running task     stack:25024 pid:20408 ppid:  8441 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4329 [inline]
 __schedule+0x911/0x2160 kernel/sched/core.c:5079
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5536
 irqentry_exit_cond_resched kernel/entry/common.c:392 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:384 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:428
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:lock_acquire+0x1ef/0x740 kernel/locking/lockdep.c:5480
RSP: 1b4f7f8:0000000000000000 EFLAGS: 00000046 ORIG_RAX: 0000000000000000
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs.cold+0x29c/0x508 arch/x86/kernel/process_64.c:80
Read of size 8 at addr ffffc90001b4f768 by task khungtaskd/1645

CPU: 0 PID: 1645 Comm: khungtaskd Not tainted 5.12.0-rc4-next-20210326-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+0x141/0x1d7 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
 __show_regs.cold+0x29c/0x508 arch/x86/kernel/process_64.c:80
 show_trace_log_lvl+0x25b/0x2ba arch/x86/kernel/dumpstack.c:298
 sched_show_task kernel/sched/core.c:7372 [inline]
 sched_show_task+0x443/0x590 kernel/sched/core.c:7346
 check_killed_task kernel/hung_task.c:183 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:241 [inline]
 watchdog.cold+0xd8/0x248 kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294


Memory state around the buggy address:
 ffffc90001b4f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001b4f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90001b4f700: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
                                                          ^
 ffffc90001b4f780: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001b4f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================