================================================================================ UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7712:14 shift exponent 79 is too large for 64-bit type 'long unsigned int' CPU: 1 PID: 2169 Comm: kswapd1 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e 1b 53 f8 48 89 ef e8 76 d1 53 f8 e8 01 60 73 f8 fb bf 01 00 00 00 d6 9f 47 f8 65 8b 05 0f 36 fc 76 85 c0 74 02 5d c3 e8 6b 8b fa RSP: 0018:ffffc900073276b0 EFLAGS: 00000202 RAX: 000000000022d88f RBX: 000000000000001d RCX: 1ffffffff1f54f62 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff88804025f850 R08: 0000000000000001 R09: ffffffff8fa9f8b7 R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001d R13: ffff8880111ca000 R14: 0000000000000000 R15: ffff88804025f800 spin_unlock_irq include/linux/spinlock.h:404 [inline] shrink_active_list+0x772/0x12d0 mm/vmscan.c:2097 shrink_list mm/vmscan.c:2164 [inline] shrink_lruvec+0xab0/0x14f0 mm/vmscan.c:2465 shrink_node_memcgs mm/vmscan.c:2653 [inline] shrink_node+0x868/0x1de0 mm/vmscan.c:2770 kswapd_shrink_node mm/vmscan.c:3513 [inline] balance_pgdat+0x745/0x1270 mm/vmscan.c:3671 kswapd+0x5b6/0xdb0 mm/vmscan.c:3928 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ================================================================================