================================================================================ UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7712:14 shift exponent 127 is too large for 64-bit type 'long unsigned int' CPU: 2 PID: 93 Comm: kworker/u17:3 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: 0x0 (wg-kex-wg0) 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 newidle_balance+0x6b3/0xe50 kernel/sched/fair.c:10611 pick_next_task_fair+0x94/0xce0 kernel/sched/fair.c:7130 pick_next_task kernel/sched/core.c:4889 [inline] __schedule+0x370/0x21b0 kernel/sched/core.c:5040 schedule+0xcf/0x270 kernel/sched/core.c:5152 worker_thread+0x14c/0x1120 kernel/workqueue.c:2442 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ================================================================================ Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 93 Comm: kworker/u17:3 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: 0x0 (wg-kex-wg0) Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 panic+0x306/0x73d kernel/panic.c:231 ubsan_epilogue+0x54/0x5a lib/ubsan.c:162 __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 newidle_balance+0x6b3/0xe50 kernel/sched/fair.c:10611 pick_next_task_fair+0x94/0xce0 kernel/sched/fair.c:7130 pick_next_task kernel/sched/core.c:4889 [inline] __schedule+0x370/0x21b0 kernel/sched/core.c:5040 schedule+0xcf/0x270 kernel/sched/core.c:5152 worker_thread+0x14c/0x1120 kernel/workqueue.c:2442 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ======================================================