rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P23295/1:b..l
	(detected by 1, t=10502 jiffies, g=95217, q=1818)
task:syz.0.6811      state:R  running task     stack:22640 pid:23295 ppid: 21489 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:kasan_poison+0x2e/0x50 mm/kasan/shadow.c:98
Code: 75 36 48 89 f0 a8 07 75 32 48 89 f9 48 c1 e9 03 49 b8 00 00 00 00 00 fc ff df 4c 01 c1 48 01 f8 48 c1 e8 03 0f b6 f2 48 29 c8 <4c> 01 c0 48 89 cf 48 89 c2 e9 94 2e 4c 02 0f 0b c3 0f 0b c3 66 2e
RSP: 0018:ffffc90002f3f788 EFLAGS: 00000207
RAX: 2000040000000000 RBX: ffff88805ea3d800 RCX: ffffed100bd47b40
RDX: 00000000000000fc RSI: 00000000000000fc RDI: ffff88805ea3da00
RBP: ffffc90002f3f9b0 R08: dffffc0000000000 R09: ffff88805ea3d800
R10: dffffc0000000000 R11: ffffed1004c73bd4 R12: 0000000000000200
R13: 0000000000000a20 R14: 0000000000082a20 R15: ffff888016c41c80
 ____kasan_kmalloc mm/kasan/common.c:505 [inline]
 __kasan_kmalloc+0x6b/0xf0 mm/kasan/common.c:522
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
 __bpf_try_make_writable net/core/filter.c:1667 [inline]
 bpf_try_make_writable net/core/filter.c:1673 [inline]
 bpf_try_make_head_writable net/core/filter.c:1681 [inline]
 ____bpf_clone_redirect net/core/filter.c:2456 [inline]
 bpf_clone_redirect+0x1bb/0x470 net/core/filter.c:2425
 bpf_prog_adbcbe7ebb50a38f+0x19/0x8f0
 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x2a8/0x800 net/bpf/test_run.c:119
 bpf_prog_test_run_skb+0x9cc/0x1180 net/bpf/test_run.c:674
 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3374
 __sys_bpf+0x5a5/0x6f0 kernel/bpf/syscall.c:4675
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb353644819
RSP: 002b:00007fb35187d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fb3538be090 RCX: 00007fb353644819
RDX: 0000000000000050 RSI: 00002000000003c0 RDI: 000000000000000a
RBP: 00007fb3536dac91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3538be128 R14: 00007fb3538be090 R15: 00007ffc5fcf95c8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10481 jiffies! g95217 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=37416
rcu: rcu_preempt kthread starved for 10482 jiffies! g95217 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27504 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23302 Comm: syz.3.6818 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:895 [inline]
RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline]
RIP: 0010:lock_release+0x9f/0x8a0 kernel/locking/lockdep.c:5634
Code: f3 f3 f3 e9 3e 07 00 00 65 8b 1d d4 81 a4 7e 83 fb 08 0f 83 4e 05 00 00 89 d8 c1 e8 06 48 8d 3c c5 68 f0 89 8d be 08 00 00 00 <e8> 4c c1 60 00 89 d8 48 0f a3 05 ba 5c 2c 0c 73 0d e8 6b 4c 07 00
RSP: 0018:ffffc900000075a0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: edd7a4b5686e7700
RDX: ffffffff819c2425 RSI: 0000000000000008 RDI: ffffffff8d89f068
RBP: ffffc900000076b0 R08: ffffffff8d89f06f R09: 1ffffffff1b13e0d
R10: dffffc0000000000 R11: fffffbfff1b13e0e R12: 1ffff92000000ec0
R13: dffffc0000000000 R14: ffff88806406a818 R15: 1ffff92000000ec0
FS:  00007fa54caf96c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa54caf8ff8 CR3: 0000000025838000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __perf_output_begin kernel/events/ring_buffer.c:262 [inline]
 perf_output_begin_forward+0x79b/0xa40 kernel/events/ring_buffer.c:271
 __perf_event_output kernel/events/core.c:7804 [inline]
 perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a9/0x830 kernel/softirq.c:564
Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 00 10 2a 8a e8 2b 99 73 08 65 66 c7 05 51 47 ba 7e 00 00 e8 9c 0e 36 00 fb 89 5c 24 34 <b8> ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 d2 00 00 00
RSP: 0018:ffffc90000007e20 EFLAGS: 00000282
RAX: edd7a4b5686e7700 RBX: 0000000000000200 RCX: edd7a4b5686e7700
RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe40
RBP: ffffc90000007f30 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 000000000000000a
R13: 0000000000000000 R14: ffff888022c3bb80 R15: dffffc0000000000
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_read_unlock_special+0xbf/0x4a0 kernel/rcu/tree_plugin.h:-1
Code: 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 80 00 00 00 0f 85 4e 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <49> 89 ff 42 c6 44 2b 08 00 48 c7 44 24 60 00 00 00 00 9c 8f 44 24
RSP: 0018:ffffc9000302fb60 EFLAGS: 00000246
RAX: f2f2f2f8f1f1f1f1 RBX: 1ffff92000605f70 RCX: 0000000000080000
RDX: ffffc90006311000 RSI: 000000000001c586 RDI: ffff888022c3bb80
RBP: ffffc9000302fc30 R08: dffffc0000000000 R09: 1ffffffff203aa18
R10: dffffc0000000000 R11: fffffbfff203aa19 R12: 1ffff110045877f7
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 net_generic+0x1b7/0x200 include/net/netns/generic.h:47
 mptcp_pm_get_subflows_max net/mptcp/pm_netlink.c:256 [inline]
 mptcp_pm_nl_data_init+0x4b/0x2e0 net/mptcp/pm_netlink.c:1186
 __mptcp_init_sock+0x409/0x510 net/mptcp/protocol.c:2618
 mptcp_init_sock+0xa2/0x730 net/mptcp/protocol.c:2633
 inet_create+0xc09/0xef0 net/ipv4/af_inet.c:381
 __sock_create+0x47b/0x900 net/socket.c:1495
 sock_create net/socket.c:1551 [inline]
 __sys_socket+0xe2/0x170 net/socket.c:1593
 __do_sys_socket net/socket.c:1602 [inline]
 __se_sys_socket net/socket.c:1600 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1600
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa54e89f819
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:00007fa54caf9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fa54eb18fa0 RCX: 00007fa54e89f819
RDX: 0000000000000106 RSI: 0200000000000001 RDI: 0000000000000002
RBP: 00007fa54e935c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa54eb19038 R14: 00007fa54eb18fa0 R15: 00007fffe88fe688
 </TASK>