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UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38
shift exponent -236 is negative
CPU: 0 PID: 215 Comm: kworker/u4:5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <IRQ>
 __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+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __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:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 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: 0010:lockdep_enabled kernel/locking/lockdep.c:90 [inline]
RIP: 0010:lockdep_enabled+0x67/0xa0 kernel/locking/lockdep.c:82
Code: 7e 85 d2 75 41 65 48 8b 1c 25 00 f0 01 00 48 8d bb 84 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1b 8b 83 84 09 00
RSP: 0018:ffffc900014c7b68 EFLAGS: 00000a03
RAX: dffffc0000000000 RBX: ffff888011a083c0 RCX: 1ffffffff1a07a23
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888011a08d44
RBP: ffffffff8b373860 R08: 0000000000000000 R09: ffffffff8d039f4f
R10: fffffbfff1a073e9 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000347
 lock_is_held_type+0x19/0x100 kernel/locking/lockdep.c:5469
 lock_is_held include/linux/lockdep.h:271 [inline]
 rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:123
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x5b7/0x710 kernel/locking/lockdep.c:5448
 rcu_lock_release include/linux/rcupdate.h:264 [inline]
 rcu_read_unlock include/linux/rcupdate.h:702 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x7a3/0xe50 net/batman-adv/network-coding.c:715
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
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