================================================================================ UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7712:14 shift exponent 1383 is too large for 64-bit type 'long unsigned int' CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 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:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 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:default_idle+0xe/0x10 arch/x86/kernel/process.c:689 Code: ff ff ff 48 89 df e8 c1 b3 b0 f8 e9 52 ff ff ff 4c 89 e7 e8 b4 b3 b0 f8 eb 93 66 90 e9 07 00 00 00 0f 00 2d 34 41 60 00 fb f4 cc 41 55 41 54 55 48 89 fd 53 e8 42 7d 6d f8 e8 6d af fd ff 48 RSP: 0018:ffffffff8bc07e40 EFLAGS: 00000206 RAX: 00000000001a69b7 RBX: ffffffff8bcbc400 RCX: ffffffff89035070 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: fffffbfff1797880 R08: 0000000000000001 R09: ffff88802ca361cb R10: ffffed1005946c39 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8dc4f5c8 R15: 0000000000000000 default_idle_call+0x87/0xd0 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x3fa/0x590 kernel/sched/idle.c:300 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:397 start_kernel+0x475/0x496 init/main.c:1064 secondary_startup_64_no_verify+0xb0/0xbb ================================================================================