hrtimer: interrupt took 28211 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=4ae4/1/0x4000000000000000 softirq=13733/13733 fqs=4
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   312933          0            0
rcu: 	cputime:     9160       9269           62   ==> 18440(ms)
rcu: 	(t=10501 jiffies g=7069 q=60238 ncpus=2)
rcu: rcu_preempt kthread starved for 1525 jiffies! g7069 f0x2 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:26792 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x16f5/0x4d00
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </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 UID: 0 PID: 5832 Comm: udevd Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x40
Code: 86 76 15 f6 90 0f 0b 90 90 90 eb c4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 31 c0 83 3d 17 4b 33 04 00 74 1e 83 3d 3a 7b 33 04 00
RSP: 0018:ffffc90002fef768 EFLAGS: 00000002
RAX: ffffffff81cb5a44 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888108599cc0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002fef878 R08: 0000000000000000 R09: ffffffff81cb5957
R10: ffffe8ff1465900c R11: fffff91fe28cb203 R12: 0000000000000001
R13: ffffc90002fef800 R14: ffff88803474ee80 R15: ffffffff8e1a0328
FS:  00007fc62a4e5c80(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff632c6548 CR3: 000000010e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0xa/0x50
 trace_call_bpf+0x1ad/0x850
 perf_trace_run_bpf_submit+0x78/0x170
 perf_trace_preemptirq_template+0x280/0x340
 trace_irq_disable+0xee/0x110
 _raw_spin_lock_irq+0x7d/0xf0
 signalfd_poll+0xfc/0x1c0
 ep_try_send_events+0x6d2/0xf40
 do_epoll_wait+0x53f/0xf40
 __x64_sys_epoll_wait+0x1be/0x210
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc62a123457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff632c6548 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc62a123457
RDX: 0000000000000004 RSI: 00007fff632c6588 RDI: 0000000000000004
RBP: 00007fff632c6594 R08: 0000000000000007 R09: 54b4e5ae82a4763f
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055df27b7ead0
R13: 00007fff632c6588 R14: 0000000000000001 R15: 000055df27b5f910
 </TASK>
CPU: 1 UID: 0 PID: 5900 Comm: syz.2.4 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001dff80 EFLAGS: 00000206
RAX: 5f60fb249543c900 RBX: 1ffff9200003bff8 RCX: 5f60fb249543c900
RDX: 0000000000000002 RSI: ffffffff8d998940 RDI: ffffffff8be29f40
RBP: ffffc900001e0078 R08: ffffffff8fa1e9f7 R09: 1ffffffff1f43d3e
R10: dffffc0000000000 R11: fffffbfff1f43d3f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f93615ab6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000024000 CR3: 0000000027a6a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 skb_release_data+0x62d/0x7c0
 kfree_skb_list_reason+0x25d/0x460
 __dev_queue_xmit+0x2148/0x3a70
 lapb_data_transmit+0x90/0xb0
 lapb_transmit_buffer+0x163/0x200
 lapb_t1timer_expiry+0x699/0xab0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__schedule+0x4/0x4d00
Code: f8 89 d9 48 8b 5c 24 08 e9 ee fe ff ff cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 01
RSP: 0018:ffffc9000331f058 EFLAGS: 00000286
RAX: 5f60fb249543c900 RBX: 0000000000000000 RCX: 5f60fb249543c900
RDX: 0000000000000007 RSI: ffffffff8d998940 RDI: 0000000000000001
RBP: ffffc9000331f110 R08: ffffffff8fa1e9f7 R09: 1ffffffff1f43d3e
R10: dffffc0000000000 R11: fffffbfff1f43d3f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000663e0c
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x137/0x190
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 72 31 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000331f1d8 EFLAGS: 00000206
RAX: 5f60fb249543c900 RBX: 0000000000000001 RCX: 5f60fb249543c900
RDX: ffff88801b3a3980 RSI: ffffffff8db8665f RDI: ffffffff8be29f40
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff820903c2
R10: dffffc0000000000 R11: ffffed100436d3f0 R12: 0000000000000246
R13: ffff88801b3a3980 R14: ffff888021b69fe0 R15: 0000000000000001
 find_vma+0xb4/0x160
 lock_mm_and_find_vma+0x5f/0x300
 do_user_addr_fault+0x331/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 e9 fd 00 04 00 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc9000331f498 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880347dd084 RCX: 000000000000005c
RDX: 0000000000000001 RSI: 0000200000023ffc RDI: ffff8880347dd328
RBP: ffffc9000331f5f0 R08: ffff8880347dd607 R09: 1ffff110068fbac0
R10: dffffc0000000000 R11: ffffed10068fbac1 R12: 1ffff92000663fbf
R13: 0000200000023d58 R14: ffffc9000331fe08 R15: 0000000000000584
 _copy_from_iter+0x24c/0x16f0
 rxrpc_send_data+0x1015/0x2160
 rxrpc_do_sendmsg+0x1098/0x1220
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f936078e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f93615ab038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f93609b5fa0 RCX: 00007f936078e9a9
RDX: 0000000000008000 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007f9360810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f93609b5fa0 R15: 00007ffd580f7208
 </TASK>
sched: DL replenish lagged too much
