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: 	(detected by 0, t=10505 jiffies, g=47713, q=166 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10505 (4294983040-4294972535), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10505 jiffies! g47713 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:28904 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x10e9/0x6820 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7282
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 10783 Comm: syz.2.1338 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_object_activate+0xa5/0x490 lib/debugobjects.c:823
Code: 00 31 c0 80 3d 8b 93 d5 0b 00 48 89 7c 24 68 48 c7 44 24 50 00 00 00 00 48 c7 44 24 58 00 00 00 00 48 c7 44 24 60 00 00 00 00 <48> 89 74 24 70 48 89 74 24 18 75 4a 31 d2 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90000a08d60 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff8880b8528600 RCX: ffffffff81f44abb
RDX: ffff8880284ba500 RSI: ffffffff8bb2dde0 RDI: ffff888054abb300
RBP: ffffc90000a08e48 R08: 0000000000000005 R09: ffffc90000a08d80
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 1ffff920001411b0
FS:  000055556ff73500(0000) GS:ffff888124476000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000024000 CR3: 000000002bc47000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109
 __run_hrtimer kernel/time/hrtimer.c:1946 [inline]
 __hrtimer_run_queues+0x73d/0xa00 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x19e/0x310 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 1b 70 26 12 83 f8 01 0f 85 28 01 00 00 9c 58 f6 c4 02 0f 85 13 01 00 00 41 f7 c6 00 02 00 00 0f 85 c0 00 00 00 <48> 8b 44 24 10 65 48 2b 05 6d 28 26 12 0f 85 4e 01 00 00 48 83 c4
RSP: 0018:ffffc9000249fa68 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e6ab6a0 RCX: ffffc9000249fa74
RDX: 0000000000000000 RSI: ffffffff8defa991 RDI: ffffffff8c1c3600
RBP: ffffffff8b8b3d4f R08: 0000000000000001 R09: 00000000000000c8
R10: 0000000000000200 R11: 0000000000000000 R12: ffff8880284ba500
R13: dffffc0000000000 R14: 0000000000000287 R15: 0000000000000001
 sched_submit_work kernel/sched/core.c:7248 [inline]
 schedule+0x2c4/0x390 kernel/sched/core.c:7281
 futex_do_wait+0x88/0x180 kernel/futex/waitwake.c:358
 __futex_wait+0x1c4/0x300 kernel/futex/waitwake.c:691
 futex_wait+0xe6/0x370 kernel/futex/waitwake.c:719
 do_futex+0x1ef/0x350 kernel/futex/syscalls.c:130
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex kernel/futex/syscalls.c:188 [inline]
 __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:188
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc8679cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff740cda78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000056612 RCX: 00007fdc8679cdd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdc86a1618c
RBP: 0000000000000032 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fff740cdb80 R11: 0000000000000246 R12: 00007fff740cdba0
R13: 00007fdc86a1618c R14: 0000000000056644 R15: 00007fff740cdb80
 </TASK>