rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=f474/1/0x4000000000000000 softirq=20042/20042 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   957230          0            0
rcu: 	cputime:    27625      24864          113   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=10973 q=3147 ncpus=2)
CPU: 0 UID: 0 PID: 7396 Comm: syz.2.671 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:ffffc900000072c0 EFLAGS: 00000206
RAX: 840e338e6e442a00 RBX: 1ffff92000000e60 RCX: 840e338e6e442a00
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900000073b8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f7bdc79a6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000395da000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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+0x55/0x70
 tcp_write_queue_purge+0x143/0x2f0
 tcp_done_with_error+0x43/0xd0
 tcp_retransmit_timer+0x1d16/0x3370
 tcp_write_timer+0x162/0x2e0
 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_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 1d 21 f6 e8 c6 f0 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900042176c0 EFLAGS: 00000282
RAX: 840e338e6e442a00 RBX: 0000000000000000 RCX: 840e338e6e442a00
RDX: 0000000000000007 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc90004217760 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000842ed8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:from_kgid+0xb9/0x650
Code: 44 89 fe e8 99 33 04 00 49 83 ff 05 0f 87 b3 00 00 00 31 ff 44 89 fe e8 85 33 04 00 4d 85 ff 0f 84 31 01 00 00 4c 89 64 24 18 <49> 8d 7e 44 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 89 ea 0f
RSP: 0018:ffffc90004217820 EFLAGS: 00000202
RAX: ffffffff81bbf9ab RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff888108068000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900042178d8 R08: ffff88810000e103 R09: 1ffff11020001c20
R10: dffffc0000000000 R11: ffffed1020001c21 R12: 1ffff92000842f08
R13: dffffc0000000000 R14: ffffffff8dfe1840 R15: 0000000000000001
 capable_wrt_inode_uidgid+0x1d9/0x290
 generic_permission+0x226/0x690
 kernfs_iop_permission+0x2fc/0x430
 inode_permission+0x285/0x470
 link_path_walk+0x232/0xea0
 __filename_parentat+0x246/0x670
 filename_create+0xcf/0x470
 do_mkdirat+0xa0/0x590
 __x64_sys_mkdir+0x6c/0x80
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7bdb98e9a9
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:00007f7bdc79a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f7bdbbb5fa0 RCX: 00007f7bdb98e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f7bdba10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7bdbbb5fa0 R15: 00007ffcdc75d8a8
 </TASK>
sched: DL replenish lagged too much
