rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=6524/1/0x4000000000000000 softirq=26601/26601 fqs=5203
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   881061          0            0
rcu: 	cputime:    26251      26238          112   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=22269 q=2595 ncpus=2)
CPU: 0 UID: 0 PID: 8728 Comm: syz.0.815 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:ffffc90000007360 EFLAGS: 00000206
RAX: 07a5baa2537ac900 RBX: 1ffff92000000e74 RCX: 07a5baa2537ac900
RDX: 0000000000000002 RSI: ffffffff8d998940 RDI: ffffffff8be29f40
RBP: ffffc90000007458 R08: ffffffff8fa1e9f7 R09: 1ffffffff1f43d3e
R10: dffffc0000000000 R11: fffffbfff1f43d3f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f8348a6d6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2f0921 CR3: 00000000436a8000 CR4: 00000000000006f0
DR0: 0000000000000000 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
 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:ffffc9000676f8a0 EFLAGS: 00000286
RAX: 07a5baa2537ac900 RBX: 0000000000000000 RCX: 07a5baa2537ac900
RDX: 0000000000000000 RSI: ffffffff8d998940 RDI: 0000000000000001
RBP: ffffc9000676f940 R08: ffffffff8fa1e9f7 R09: 1ffffffff1f43d3e
R10: dffffc0000000000 R11: fffffbfff1f43d3f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000cedf14
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:tty_audit_fork+0x0/0xc0
Code: ff 49 89 d4 e8 81 e6 e5 fc 4c 89 e2 e9 fd fe ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 41 57 41 56 41 54 53 48 89 fb 49 bc 00 00 00 00 00
RSP: 0018:ffffc9000676fa00 EFLAGS: 00000283
RAX: ffffffff81b0c964 RBX: ffff888022bab800 RCX: 0000000000080000
RDX: ffffc900213d9000 RSI: 0000000000004745 RDI: ffff888022bab800
RBP: ffff888039b48618 R08: ffff888022bab99f R09: 0000000000000000
R10: ffff888022bab950 R11: ffffed1004575734 R12: ffff888022babb80
R13: 1ffff11007369124 R14: ffff888039b48920 R15: ffff888022bab950
 copy_signal+0x437/0x630
 copy_process+0x166e/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8347b8e9a9
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:00007f8348a6cfe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8347db6080 RCX: 00007f8347b8e9a9
RDX: 00002000000002c0 RSI: 0000200000000280 RDI: 0000000001040000
RBP: 00007f8347c10d69 R08: 0000200000000340 R09: 0000200000000340
R10: 0000200000000300 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8347db6080 R15: 00007fffac409548
 </TASK>
sched: DL replenish lagged too much
