================================================================================ UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7712:14 shift exponent 152 is too large for 64-bit type 'long unsigned int' CPU: 1 PID: 19360 Comm: kworker/u4:4 Not tainted 5.12.0-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 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327 detach_tasks kernel/sched/fair.c:7712 [inline] load_balance.cold+0x1d/0x2e kernel/sched/fair.c:9641 rebalance_domains+0x5cc/0xdb0 kernel/sched/fair.c:10029 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:check_kcov_mode+0x31/0x40 kernel/kcov.c:175 Code: 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 34 15 00 00 85 d2 74 0b 8b 86 10 15 00 00 39 f8 0f 94 c0 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 65 8b 15 27 0f RSP: 0018:ffffc90008c2fde0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff88807b9bb880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807b9bb880 RDI: 0000000000000003 RBP: ffffc90008c2b1b0 R08: 0000000000000000 R09: ffff888025b5e107 R10: ffffffff8144d209 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc90008c28000 R14: dffffc0000000000 R15: ffff88807b9bbe30 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:291 stack_not_used include/linux/sched/task_stack.h:101 [inline] check_stack_usage kernel/exit.c:710 [inline] do_exit+0x18b9/0x2a60 kernel/exit.c:868 call_usermodehelper_exec_async+0x413/0x580 kernel/umh.c:123 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ================================================================================