rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=6b64/1/0x4000000000000000 softirq=18597/18599 fqs=4666
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1047665          0            0
rcu: 	cputime:    24477      28012           89   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=10845 q=3847 ncpus=2)
CPU: 0 UID: 0 PID: 7028 Comm: syz.2.507 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a #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 92 37 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:ffffc900000075a0 EFLAGS: 00000206
RAX: 331f9b084badb000 RBX: 1ffff92000000ebc RCX: 331f9b084badb000
RDX: 0000000000000000 RSI: ffffffff8d9986f9 RDI: ffffffff8be29f80
RBP: ffffc90000007698 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f1c88e1d6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000018c0 CR3: 0000000127f02000 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
 kfree+0x18e/0x440
 slab_free_after_rcu_debug+0x60/0x2a0
 rcu_core+0xca8/0x1710
 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:stack_depot_save_flags+0x1be/0x900
Code: 24 04 85 db 75 62 4d 8b 24 24 4d 39 fc 74 56 41 39 6c 24 10 75 f0 45 39 54 24 14 75 e9 31 c0 49 8b 0c c6 49 3b 4c c4 20 75 dc <48> ff c0 41 39 c5 75 ed 83 fe 02 72 31 49 8d 7c 24 1c 41 8b 5c 24
RSP: 0018:ffffc90006ab76b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000cc0 RCX: ffffffff8223089e
RDX: 00000000fbfc6816 RSI: 0000000000000001 RDI: 00000000d490a52c
RBP: 0000000035b313dd R08: 0000000060ca2a96 R09: 000000005bf036e0
R10: 0000000000000009 R11: ffffffff81acf520 R12: ffff88810ebc5fe0
R13: 0000000000000009 R14: ffffc90006ab7730 R15: ffff888135713dd0
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 sock_kmalloc+0xd6/0x160
 ____sys_sendmsg+0x1b5/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c87f8eb69
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:00007f1c88e1d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1c881b5fa0 RCX: 00007f1c87f8eb69
RDX: 0000000000000000 RSI: 0000200000000700 RDI: 0000000000000009
RBP: 00007f1c88011df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1c881b5fa0 R15: 00007ffc75391c18
 </TASK>
sched: DL replenish lagged too much
