rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-....: (6 ticks this GP) idle=be5/1/0x4000000000000002 softirq=9199/9199 fqs=5219 
	(detected by 0, t=10502 jiffies, g=11137, q=735)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4990 Comm: syz.2.219 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:bpf_bprintf_cleanup+0x64/0xc0 kernel/bpf/helpers.c:749
Code: c3 08 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 1e b4 2f 00 48 83 3b 00 74 47 e8 93 95 ea ff 65 8b 1d 9c e0 74 7e <31> ff 89 de e8 e3 98 ea ff 85 db 74 35 65 ff 0d 88 e0 74 7e bf 01
RSP: 0000:ffffc90000dd05a8 EFLAGS: 00000046
RAX: ffffffff818e5ce6 RBX: 0000000000000001 RCX: ffff8880788d9dc0
RDX: 0000000000000100 RSI: ffffffff8a7a2a20 RDI: ffffc90000dd0640
RBP: ffffc90000dd06d8 R08: ffffffff8d8aeaef R09: 1ffffffff1b15d5d
R10: dffffc0000000000 R11: fffffbfff1b15d5e R12: 0000000000000001
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  00007fb08b5376c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32713ff8 CR3: 000000005b06c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ____bpf_trace_printk kernel/trace/bpf_trace.c:385 [inline]
 bpf_trace_printk+0x1ca/0x360 kernel/trace/bpf_trace.c:366
 bpf_prog_aea2c817d5df3397+0x38/0x2e8
 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_PROG_RUN_ARRAY include/linux/bpf.h:1439 [inline]
 trace_call_bpf+0x2b1/0x5b0 kernel/trace/bpf_trace.c:127
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10016
 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:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0000:ffffc90000dd0a20 EFLAGS: 00000206
RAX: 4ccba045fc6ade00 RBX: 1ffff920001ba148 RCX: 4ccba045fc6ade00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2a40
RBP: ffffc90000dd0b00 R08: ffffffff901e918f R09: 1ffffffff203d231
R10: dffffc0000000000 R11: fffffbfff203d232 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 process_backlog+0x3e5/0x770 net/core/dev.c:6543
 __napi_poll+0xbb/0x430 net/core/dev.c:7101
 napi_poll net/core/dev.c:7168 [inline]
 net_rx_action+0x522/0xa80 net/core/dev.c:7258
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __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:lock_release+0x33/0x8a0 kernel/locking/lockdep.c:5631
Code: 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 00 00 48 89 74 24 30 48 89 7c 24 08 65 48 8b 04 25 28 00 00 00 48 89 84 24 c0 00 00 00 <49> bd 00 00 00 00 00 fc ff df 48 c7 44 24 60 b3 8a b5 41 48 c7 44
RSP: 0000:ffffc900031eeb00 EFLAGS: 00000286
RAX: 4ccba045fc6ade00 RBX: ffff88807dcace10 RCX: 4ccba045fc6ade00
RDX: 0000000000000002 RSI: ffffffff81c32ae0 RDI: ffffffff8c31ef20
RBP: ffffc900031eec10 R08: ffffffff8d8aeaef R09: 1ffffffff1b15d5d
R10: dffffc0000000000 R11: fffffbfff1b15d5e R12: dffffc0000000000
R13: 1ffff1100fb959c2 R14: ffff88807e158000 R15: ffff88807e158054
 rcu_read_unlock include/linux/rcupdate.h:773 [inline]
 get_mem_cgroup_from_objcg+0x10e/0x120 mm/memcontrol.c:2817
 obj_cgroup_uncharge_pages mm/memcontrol.c:2992 [inline]
 __memcg_kmem_uncharge_page+0x74/0x140 mm/memcontrol.c:3083
 memcg_kmem_uncharge_page include/linux/memcontrol.h:1703 [inline]
 free_thread_stack+0x1a1/0x420 kernel/fork.c:284
 release_task_stack kernel/fork.c:434 [inline]
 put_task_stack+0x97/0x140 kernel/fork.c:445
 finish_task_switch+0x26f/0x650 kernel/sched/core.c:4961
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11cb/0x4350 kernel/sched/core.c:6395
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 unwind_next_frame+0x1202/0x1cf0 arch/x86/kernel/unwind_orc.c:616
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 kmem_cache_alloc_node+0x184/0x2c0 mm/slub.c:3261
 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1162 [inline]
 _sctp_make_chunk+0x5b/0x430 net/sctp/sm_make_chunk.c:1444
 sctp_make_data net/sctp/sm_make_chunk.c:1476 [inline]
 sctp_make_datafrag_empty+0xa8/0x520 net/sctp/sm_make_chunk.c:741
 sctp_datamsg_from_user+0x79b/0xf00 net/sctp/chunk.c:262
 sctp_sendmsg_to_asoc+0x14cd/0x1e10 net/sctp/socket.c:1858
 sctp_sendmsg+0x1b87/0x2940 net/sctp/socket.c:2039
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536
 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: 0033:0x7fb08d2dee99
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:00007fb08b537028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb08d566fa0 RCX: 00007fb08d2dee99
RDX: 00000000000000fc RSI: 0000200000000600 RDI: 0000000000000009
RBP: 00007fb08d374eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb08d567038 R14: 00007fb08d566fa0 R15: 00007fff0834adc8
 </TASK>