rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=dff4/1/0x4000000000000000 softirq=16178/16178 fqs=4633
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   976765          0            0
rcu: 	cputime:    24050      28439           92   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=9237 q=2902 ncpus=2)
CPU: 0 UID: 0 PID: 6428 Comm: syz.2.242 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:ffffc90000007580 EFLAGS: 00000206
RAX: bb0cba882e8b7b00 RBX: 1ffff92000000eb8 RCX: bb0cba882e8b7b00
RDX: 0000000000000003 RSI: ffffffff8d998874 RDI: ffffffff8be29f40
RBP: ffffc90000007678 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fdbdd1c06c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000288e8000 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
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 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
 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:__schedule+0x8f/0x4d00
Code: 8b 48 8d 8c 24 00 01 00 00 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f2 00 00 4a 89 04 29 48 b8 f2 f2 f2 f2 f2 00 f2 f2 4a 89 44 29 09 <42> c7 44 29 11 f2 00 00 f3 66 42 c7 44 29 15 f3 f3 48 89 8c 24 f8
RSP: 0018:ffffc900075ff7a0 EFLAGS: 00000a06
RAX: f2f200f2f2f2f2f2 RBX: 0000000000000000 RCX: 1ffff92000ebff14
RDX: 0000000000000007 RSI: ffffffff8d998874 RDI: ffffc900075ff930
RBP: ffffc900075ff9b0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000ebff38
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 0b d4 01 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900075ffb20 EFLAGS: 00000206
RAX: bb0cba882e8b7b00 RBX: 0000000000000000 RCX: bb0cba882e8b7b00
RDX: 0000000000000001 RSI: ffffffff8db86591 RDI: ffffffff8be29f40
RBP: ffffffff820903e2 R08: 0000000000000000 R09: ffffffff820903e2
R10: dffffc0000000000 R11: ffffed1005315b70 R12: 0000000000000001
R13: ffff8880298adbe0 R14: 0000000000000001 R15: 0000000000000246
 down_read_trylock+0x20a/0x380
 lock_mm_and_find_vma+0x32/0x300
 do_user_addr_fault+0x331/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:strncpy_from_user+0xb7/0x290
Code: 00 00 4c 89 f6 e8 b9 f0 c9 fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 e4 4c 89 fb <4f> 8b 34 27 48 b8 ff fe fe fe fe fe fe fe 4d 8d 3c 06 4d 89 f5 49
RSP: 0018:ffffc900075ffe50 EFLAGS: 00010246
RAX: ffffffff84f63ca7 RBX: 0000000000000000 RCX: ffff8881072a5640
RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000007
RBP: fffffffffffffff8 R08: ffff88802e29a0ff R09: 1ffff11005c5341f
R10: dffffc0000000000 R11: ffffed1005c53420 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000fe0 R15: 0000000000000000
 getname_flags+0xf3/0x540
 __x64_sys_unlink+0x3a/0x50
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbdc38e9a9
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:00007fdbdd1c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fdbdc5b5fa0 RCX: 00007fdbdc38e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fdbdc410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdbdc5b5fa0 R15: 00007fffc9bdee68
 </TASK>
sched: DL replenish lagged too much
clocksource: Long readout interval, skipping watchdog check: cs_nsec: 105308079987 wd_nsec: 105308082466
