rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=2e44/1/0x4000000000000000 softirq=13972/13972 fqs=0
rcu: 	(t=10501 jiffies g=19841 q=588 ncpus=2)
rcu: rcu_preempt kthread starved for 10502 jiffies! g19841 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:28408 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6669
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1609
 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1808
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5079 Comm: kworker/0:6 Not tainted 6.4.0-rc7-syzkaller-01890-g771ca3de2502 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: events_power_efficient gc_worker
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x31/0x70 kernel/kcov.c:207
Code: 5d 70 7f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 c0 b9 03 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 0c 16 00 00 <85> c0 74 2b 8b 82 e8 15 00 00 83 f8 02 75 20 48 8b 8a f0 15 00 00
RSP: 0018:ffffc90000007c48 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffffc9000fdaa4d0 RCX: 0000000000000100
RDX: ffff888019af0000 RSI: ffffffff88401b3f RDI: 0000000000000007
RBP: fffffff0a3da8872 R08: 0000000000000007 R09: 00000000003b9aca
R10: 0000000000000000 R11: 00000000ff8c8730 R12: 0000000000989680
R13: ffff88807dcb1b00 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000093a1c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pie_calculate_probability+0x30f/0x7c0 net/sched/sch_pie.c:372
 fq_pie_timer+0x1dd/0x4f0 net/sched/sch_fq_pie.c:387
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:gc_worker+0x458/0x1790 net/netfilter/nf_conntrack_core.c:1502
Code: 89 f6 e8 3b c8 32 f9 45 84 f6 0f 85 dc 02 00 00 e8 4d cc 32 f9 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 07 11 00 00 48 8b 1b <31> ff 89 dd 83 e5 01 89 ee e8 4a c8 32 f9 85 ed 0f 85 74 05 00 00
RSP: 0018:ffffc90003f3fc20 EFLAGS: 00000246
RAX: 1ffff11004fe8a18 RBX: 0000000000051431 RCX: 0000000000000000
RDX: ffff888019af0000 RSI: ffffffff88517c44 RDI: 0000000000000004
RBP: ffff888027e00000 R08: 0000000000000004 R09: 0000000000028a18
R10: 0000000000040000 R11: 0000000000094000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000028a18 R15: 0000000000000000
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
CPU: 0 PID: 5079 Comm: kworker/0:6 Not tainted 6.4.0-rc7-syzkaller-01890-g771ca3de2502 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: events_power_efficient gc_worker
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x31/0x70 kernel/kcov.c:207
Code: 5d 70 7f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 c0 b9 03 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 0c 16 00 00 <85> c0 74 2b 8b 82 e8 15 00 00 83 f8 02 75 20 48 8b 8a f0 15 00 00
RSP: 0018:ffffc90000007c48 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffffc9000fdaa4d0 RCX: 0000000000000100
RDX: ffff888019af0000 RSI: ffffffff88401b3f RDI: 0000000000000007
RBP: fffffff0a3da8872 R08: 0000000000000007 R09: 00000000003b9aca
R10: 0000000000000000 R11: 00000000ff8c8730 R12: 0000000000989680
R13: ffff88807dcb1b00 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000093a1c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pie_calculate_probability+0x30f/0x7c0 net/sched/sch_pie.c:372
 fq_pie_timer+0x1dd/0x4f0 net/sched/sch_fq_pie.c:387
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:gc_worker+0x458/0x1790 net/netfilter/nf_conntrack_core.c:1502
Code: 89 f6 e8 3b c8 32 f9 45 84 f6 0f 85 dc 02 00 00 e8 4d cc 32 f9 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 07 11 00 00 48 8b 1b <31> ff 89 dd 83 e5 01 89 ee e8 4a c8 32 f9 85 ed 0f 85 74 05 00 00
RSP: 0018:ffffc90003f3fc20 EFLAGS: 00000246
RAX: 1ffff11004fe8a18 RBX: 0000000000051431 RCX: 0000000000000000
RDX: ffff888019af0000 RSI: ffffffff88517c44 RDI: 0000000000000004
RBP: ffff888027e00000 R08: 0000000000000004 R09: 0000000000028a18
R10: 0000000000040000 R11: 0000000000094000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000028a18 R15: 0000000000000000
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 5079 Comm: kworker/0:6 Not tainted 6.4.0-rc7-syzkaller-01890-g771ca3de2502 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: events_power_efficient gc_worker
RIP: 0010:pie_calculate_probability+0x1ed/0x7c0 net/sched/sch_pie.c:340
Code: 85 b8 05 00 00 48 bf 98 99 99 99 99 99 19 00 4c 89 f0 4c 89 fe 49 2b 45 00 48 89 44 24 10 4c 89 f0 48 2b 04 24 48 89 44 24 18 <e8> 7e 2b 44 f9 48 b8 98 99 99 99 99 99 19 00 49 39 c7 0f 87 42 02
RSP: 0018:ffffc90000007c50 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000f4b5730 RCX: 0000000000000100
RDX: 1ffff1100d2b3e60 RSI: 0000000000000000 RDI: 0019999999999998
RBP: 0000000225c17d04 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000db8cf4f1 R12: 00000015798ee228
R13: ffff88806959f300 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000093a1c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 fq_pie_timer+0x1dd/0x4f0 net/sched/sch_fq_pie.c:387
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:gc_worker+0x458/0x1790 net/netfilter/nf_conntrack_core.c:1502
Code: 89 f6 e8 3b c8 32 f9 45 84 f6 0f 85 dc 02 00 00 e8 4d cc 32 f9 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 07 11 00 00 48 8b 1b <31> ff 89 dd 83 e5 01 89 ee e8 4a c8 32 f9 85 ed 0f 85 74 05 00 00
RSP: 0018:ffffc90003f3fc20 EFLAGS: 00000246
RAX: 1ffff11004fe8a18 RBX: 0000000000051431 RCX: 0000000000000000
RDX: ffff888019af0000 RSI: ffffffff88517c44 RDI: 0000000000000004
RBP: ffff888027e00000 R08: 0000000000000004 R09: 0000000000028a18
R10: 0000000000040000 R11: 0000000000094000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000028a18 R15: 0000000000000000
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>