rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=08ec/1/0x4000000000000000 softirq=16620/16620 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1033805          0            0
rcu: 	cputime:    25053      27436           89   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=7681 q=3293 ncpus=2)
CPU: 0 UID: 0 PID: 6438 Comm: syz.0.168 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 d2 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:ffffc90000007600 EFLAGS: 00000206
RAX: 99fab66db8390200 RBX: 1ffff92000000ec8 RCX: 99fab66db8390200
RDX: 0000000000000003 RSI: ffffffff8d998874 RDI: ffffffff8be29f40
RBP: ffffc900000076f8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fb93b7f66c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 00000000223f4000 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
 slab_free_after_rcu_debug+0x129/0x2a0
 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:__sanitizer_cov_trace_pc+0x58/0x70
Code: 00 74 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c 16 00 00 48 39 cf 73 08 48 89 3a <48> 89 44 f2 08 e9 be 3a b1 09 cc 66 66 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc9000b12f4a8 EFLAGS: 00000283
RAX: ffffffff8b66d21a RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90003ba4000 RSI: 0000000000000848 RDI: 0000000000000849
RBP: ffffc9000b12f610 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc9000b12f57c R11: fffff52001625eb1 R12: dffffc0000000000
R13: 1ffff92001625ea4 R14: ffffffff8dab912b R15: ffffc9000b12f540
 trace_ma_read+0x3a/0x1d0
 mt_find+0x113/0x5f0
 find_vma+0xe7/0x160
 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:ffffc9000b12f898 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff88803fe30000 RCX: 00000000000013fe
RDX: 0000000000000001 RSI: 0000200000006000 RDI: ffff88803fe35e40
RBP: ffffc9000b12f9f0 R08: ffff88803fe3fe32 R09: 1ffff11007fc7fc6
R10: dffffc0000000000 R11: ffffed1007fc7fc7 R12: 1ffff92001625f77
R13: 00002000000001c0 R14: ffffc9000b12fbc8 R15: 000000000000fe33
 _copy_from_iter+0x24c/0x16f0
 netlink_sendmsg+0x6b2/0xb30
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb93d98e9a9
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:00007fb93b7f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb93dbb5fa0 RCX: 00007fb93d98e9a9
RDX: 000000000000fe33 RSI: 00002000000001c0 RDI: 0000000000000003
RBP: 00007fb93da10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb93dbb5fa0 R15: 00007ffd1081f668
 </TASK>
sched: DL replenish lagged too much
