GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 GPs behind) idle=88a/1/0x4000000000000000 softirq=92490/92492 fqs=3009 
	(detected by 0, t=10502 jiffies, g=150021, q=58356)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 27399 Comm: syz-executor.3 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x19/0x60 kernel/kcov.c:197
Code: 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 65 8b 05 e0 bf 8b 7e a9 00 01 ff 00 48 8b 34 24 <74> 0f f6 c4 01 74 35 8b 82 2c 14 00 00 85 c0 74 2b 8b 82 08 14 00
RSP: 0018:ffffc90000da8de8 EFLAGS: 00000006
RAX: 0000000080010004 RBX: 0000000000000000 RCX: ffffffff83d92b74
RDX: ffff888083ed0300 RSI: ffffffff81664f1e RDI: ffff88806548db40
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8b5980cf
R10: ffff88806548db40 R11: 0000000000000000 R12: ffff8880ae527740
R13: ffff8880ae527840 R14: ffff88806548db40 R15: dffffc0000000000
FS:  00007fcc850c6700(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33526000 CR3: 00000000a3c16000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 raw_write_seqcount_t_barrier include/linux/seqlock.h:565 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1550 [inline]
 __hrtimer_run_queues+0x29e/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x147/0x5f0 arch/x86/kernel/apic/apic.c:1097
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__sanitizer_cov_trace_pc+0x52/0x60 kernel/kcov.c:205
Code: 74 2b 8b 82 08 14 00 00 83 f8 02 75 20 48 8b 8a 10 14 00 00 8b 92 0c 14 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 <48> 89 01 c3 66 2e 0f 1f 84 00 00 00 00 00 41 55 41 54 49 89 fc 55
RSP: 0018:ffffc900064b79f8 EFLAGS: 00000212
RAX: 000000000000027d RBX: 1ffff92000c96f44 RCX: ffffc9000b526000
RDX: 0000000000040000 RSI: ffffffff816b11f0 RDI: 0000000000000005
RBP: ffffc900064b7ac8 R08: 0000000000000001 R09: ffff8880ae436dc7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000040
 rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
 cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
 csd_lock_wait kernel/smp.c:108 [inline]
 smp_call_function_single+0x190/0x500 kernel/smp.c:382
 smp_call_function_many_cond+0x1a4/0xa10 kernel/smp.c:518
 smp_call_function_many kernel/smp.c:577 [inline]
 smp_call_function kernel/smp.c:599 [inline]
 on_each_cpu+0x4c/0x1f0 kernel/smp.c:698
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876
 timekeeping_inject_offset+0x436/0x570 kernel/time/timekeeping.c:1308
 do_adjtimex+0x28f/0xa30 kernel/time/timekeeping.c:2335
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime+0x163/0x270 kernel/time/posix-timers.c:1121
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45de29
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcc850c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 0000000000001e80 RCX: 000000000045de29
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000000
RBP: 000000000118c000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4
R13: 00007ffe59b22b7f R14: 00007fcc850c69c0 R15: 000000000118bfd4
rcu: rcu_preempt kthread starved for 4413 jiffies! g150021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29096 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0xec9/0x2280 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1890 [inline]
 rcu_gp_kthread+0xb2c/0x1ca0 kernel/rcu/tree.c:2060
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294