================================================================================ UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38 shift exponent -180 is negative CPU: 1 PID: 8490 Comm: syz-fuzzer Not tainted 5.10.0-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+0x107/0x163 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:395 est_timer.cold+0xbb/0x12d net/core/gen_estimator.c:83 call_timer_fn+0x1a5/0x710 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers+0x6f6/0xb10 kernel/time/timer.c:1731 run_timer_softirq+0x7d/0x140 kernel/time/timer.c:1744 __do_softirq+0x2cb/0xad5 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x18a/0x1b0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0033:0x41f853 Code: 39 d1 0f 83 62 01 00 00 48 89 4c 24 50 48 85 c9 74 0b 83 fe 03 0f 83 f9 00 00 00 ff c6 0f b6 3b 49 89 cb 89 f1 41 89 fc d3 ef <49> 83 fb 08 74 0a 0f ba e7 04 0f 83 c2 00 00 00 41 0f a3 cc 73 b8 RSP: 002b:000000c0000a3ea8 EFLAGS: 00000202 RAX: 0000000000203000 RBX: 00007fbcff10d9f9 RCX: 0000000000000002 RDX: 0000000000000030 RSI: 0000000000000002 RDI: 0000000000000034 RBP: 000000c0000a3f28 R08: 00007fbcff121fff R09: 000000c003d73f20 R10: 000000c00001d698 R11: 0000000000000010 R12: 00000000000000d0 R13: 000000c000082a80 R14: 000000efc1284ee9 R15: 0000000000000000 ================================================================================