GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=65505, q=241 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10490 (4295063872-4295053382), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10490 jiffies! g65505 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:26776 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8439 Comm: kworker/u4:23 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:lookup_object lib/debugobjects.c:194 [inline]
RIP: 0010:debug_object_deactivate+0x6c/0x350 lib/debugobjects.c:766
Code: 48 0f af c8 48 c1 e9 2f 83 e1 f8 4c 8d ac c9 20 a3 05 97 48 8d bc c9 28 a3 05 97 48 89 7c 24 18 e8 69 02 52 06 48 89 44 24 10 <4c> 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 2e f6 b6 fd
RSP: 0018:ffffc900001f0cc0 EFLAGS: 00000046
RAX: 0000000000000806 RBX: ffff88807af8e340 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900001f0ba0
RBP: ffffc900001f0e90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e174 R12: dffffc0000000000
R13: ffffffff97119d08 R14: 186abcf468000000 R15: ffff88807af8e340
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557c986808 CR3: 000000007d7ab000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
 debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
 __run_hrtimer kernel/time/hrtimer.c:1718 [inline]
 __hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:crng_make_state+0x403/0x700 drivers/char/random.c:373
Code: 4c 8d e8 50 ca d8 05 e9 56 fe ff ff e8 e6 70 e6 fc e8 d1 22 cf 05 4d 85 f6 74 8c e8 d7 70 e6 fc fb 48 c7 44 24 40 0e 36 e0 45 <48> 8b 44 24 38 4a c7 04 20 00 00 00 00 66 42 c7 44 20 09 00 00 42
RSP: 0018:ffffc9000baf7880 EFLAGS: 00000293
RAX: ffffffff849f26c9 RBX: 0000000000000000 RCX: ffff88802bba9e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000baf7970 R08: ffffffff90da75ef R09: 1ffffffff21b4ebd
R10: dffffc0000000000 R11: fffffbfff21b4ebe R12: dffffc0000000000
R13: ffff8880b8f38fd0 R14: 0000000000000200 R15: ffff8880b8f39020
 _get_random_bytes+0xd6/0x210 drivers/char/random.c:385
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:775 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x646/0xb00 drivers/net/netdevsim/dev.c:851
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>