rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=523/1/0x4000000000000000 softirq=39595/39599 fqs=4
(detected by 0, t=10505 jiffies, g=58569, q=301 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11287 Comm: syz-executor.4 Not tainted 5.19.0-rc4-syzkaller-00205-g34074da5424c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
RIP: 0010:lock_is_held_type+0xf/0x140 kernel/locking/lockdep.c:5693
Code: 44 24 04 e8 54 f7 ba ff 0f 0b 8b 44 24 04 eb bd 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 bd ff ff ff ff 41 54 55 <53> 48 83 ec 08 8b 0d 32 19 44 04 85 c9 0f 84 d9 00 00 00 65 8b 05
RSP: 0018:ffffc900003f8da0 EFLAGS: 00000096
RAX: 0000000000000000 RBX: ffff8880213acb40 RCX: ffffffff815dfae0
RDX: 1ffff1100427595f RSI: 00000000ffffffff RDI: ffff8880213acb00
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003
R10: fffff5200007f1ac R11: 0000000000000001 R12: ffff8880213acb00
R13: 00000000ffffffff R14: ffff8880b9b2a500 R15: ffffffff8788d9e0
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 000000007b61c000 CR4: 00000000003506e0
Call Trace:
lock_is_held include/linux/lockdep.h:279 [inline]
advance_sched+0x60/0x9a0 net/sched/sch_taprio.c:716
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:stack_not_used include/linux/sched/task_stack.h:105 [inline]
RIP: 0010:check_stack_usage kernel/exit.c:719 [inline]
RIP: 0010:do_exit+0x1844/0x2a00 kernel/exit.c:839
Code: c1 e0 2a 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 0e 00 00 49 bd 00 00 00 00 00 fc ff df 4c 8b 63 20 4c 89 e3 e8 8c 6b 32 00 <48> 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 3a 0c 00 00
RSP: 0018:ffffc90003f5fe10 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffc90003f58e10 RCX: 0000000000000000
RDX: ffff88807b482000 RSI: ffffffff81472bf4 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90003f58000
R13: dffffc0000000000 R14: ffff88807b482000 R15: ffffc90003f5fe80
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f3939e89109
Code: Unable to access opcode bytes at RIP 0x7f3939e890df.
RSP: 002b:00007ffd41ceccc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f3939e89109
RDX: 00007f3939e3bd4b RSI: ffffffffffffffb8 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f3939fa0348 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd41cecdb0
rcu: rcu_preempt kthread starved for 10485 jiffies! g58569 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:28048 pid: 16 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5146 [inline]
__schedule+0xa00/0x4b50 kernel/sched/core.c:6458
schedule+0xd2/0x1f0 kernel/sched/core.c:6530
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1999
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2187
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 3695 Comm: kworker/u4:5 Not tainted 5.19.0-rc4-syzkaller-00205-g34074da5424c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:518
print_other_cpu_stall kernel/rcu/tree_stall.h:623 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:769 [inline]
rcu_pending kernel/rcu/tree.c:3977 [inline]
rcu_sched_clock_irq+0x2311/0x2370 kernel/rcu/tree.c:2675
update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline]
RIP: 0010:smp_call_function_single+0x20d/0x670 kernel/smp.c:777
Code: c5 0f 1f 44 00 00 e8 e2 81 0a 00 eb 07 e8 db 81 0a 00 f3 90 44 8b a4 24 88 00 00 00 31 ff 41 83 e4 01 44 89 e6 e8 03 7e 0a 00 <45> 85 e4 75 de e8 b9 81 0a 00 e8 b4 81 0a 00 bf 01 00 00 00 e8 ca
RSP: 0018:ffffc900036f7ac0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff920006def5c RCX: ffffffff816f15bd
RDX: ffff888022cb4180 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc900036f7bd8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
rcu_barrier+0x289/0x630 kernel/rcu/tree.c:4157
cleanup_net+0x5d3/0xb00 net/core/net_namespace.c:605
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
----------------
Code disassembly (best guess):
0: 44 24 04 rex.R and $0x4,%al
3: e8 54 f7 ba ff callq 0xffbaf75c
8: 0f 0b ud2
a: 8b 44 24 04 mov 0x4(%rsp),%eax
e: eb bd jmp 0xffffffcd
10: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
17: 00 00 00 00
1b: 41 57 push %r15
1d: 41 56 push %r14
1f: 41 55 push %r13
21: 41 bd ff ff ff ff mov $0xffffffff,%r13d
27: 41 54 push %r12
29: 55 push %rbp
* 2a: 53 push %rbx <-- trapping instruction
2b: 48 83 ec 08 sub $0x8,%rsp
2f: 8b 0d 32 19 44 04 mov 0x4441932(%rip),%ecx # 0x4441967
35: 85 c9 test %ecx,%ecx
37: 0f 84 d9 00 00 00 je 0x116
3d: 65 gs
3e: 8b .byte 0x8b
3f: 05 .byte 0x5