================================================================================
UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38
shift exponent -1 is negative
CPU: 0 PID: 4906 Comm: systemd-udevd Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+0x1a5/0x710 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x692/0xa80 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/0xa77 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+0x17f/0x200 kernel/softirq.c:420
 irq_exit_rcu+0x5/0x20 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:debug_lockdep_rcu_enabled+0x1d/0x30 kernel/rcu/update.c:278
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc 8b 05 fe 86 65 04 85 c0 74 21 8b 05 cc b7 65 04 85 c0 74 17 65 48 8b 04 25 00 f0 01 00 <8b> 80 84 09 00 00 85 c0 0f 94 c0 0f b6 c0 c3 cc cc cc cc 55 53 48
RSP: 0018:ffffc90000eef750 EFLAGS: 00000202
RAX: ffff888018a05040 RBX: 1ffff920001ddeef RCX: ffffffff8157c488
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d7d8208
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d7d820f
R10: fffffbfff1afb041 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88802d38db18 R14: 0000000000000000 R15: 0000000000000000
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0xd/0x70 kernel/rcu/update.c:121
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x5d3/0x750 kernel/locking/lockdep.c:5408
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:354 [inline]
 __d_lookup+0x215/0x760 fs/dcache.c:2393
 lookup_fast+0x2d0/0x6c0 fs/namei.c:1502
 walk_component+0xc6/0x6a0 fs/namei.c:1857
 link_path_walk.part.0+0x6b8/0xc20 fs/namei.c:2184
 link_path_walk fs/namei.c:2112 [inline]
 path_lookupat+0xb7/0x830 fs/namei.c:2333
 filename_lookup+0x19f/0x560 fs/namei.c:2367
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x142/0x390 fs/stat.c:185
 vfs_fstatat fs/stat.c:207 [inline]
 vfs_lstat include/linux/fs.h:3123 [inline]
 __do_sys_newlstat+0x91/0x110 fs/stat.c:362
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f575bd41335
Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89
RSP: 002b:00007ffc03924a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055f6dcd60c40 RCX: 00007f575bd41335
RDX: 00007ffc03924ac0 RSI: 00007ffc03924ac0 RDI: 000055f6dcd5fc40
RBP: 00007ffc03924b80 R08: 00007f575c0001f8 R09: 0000000000001010
R10: 00007f575bfffb58 R11: 0000000000000246 R12: 000055f6dcd5fc40
R13: 000055f6dcd5fc63 R14: 000055f6dcd4a8c1 R15: 000055f6dcd4a8c3
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