rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=85a4/1/0x4000000000000000 softirq=24735/24736 fqs=4828
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   946901          0            0
rcu: 	cputime:    24369      28110           96   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=14053 q=2366 ncpus=2)
CPU: 0 UID: 0 PID: 7040 Comm: syz.1.356 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:ffffc900000075a0 EFLAGS: 00000206
RAX: 804d2b2005a09300 RBX: 1ffff92000000ebc RCX: 804d2b2005a09300
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc90000007698 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f005207e6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000222ca000 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:__sanitizer_cov_trace_const_cmp4+0x0/0x90
Code: 7c 11 10 48 89 74 11 18 48 89 44 11 20 e9 88 36 b1 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 14 25 08 10 a0 92 65 8b 0d e8 e2
RSP: 0018:ffffc90003a0f658 EFLAGS: 00000246
RAX: ffffffff84c041db RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8881113f0000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8dd8c668 R08: ffffffff8b632ce0 R09: 1ffff11005386cae
R10: dffffc0000000000 R11: ffffffff8b632ce0 R12: ffffffff8dd8c4c4
R13: ffffc90003a0f6c0 R14: 000000000000000c R15: 0000000000000047
 bsearch+0x68/0xc0
 search_extable+0x8f/0xd0
 search_exception_tables+0x3a/0x60
 fixup_exception+0xad/0x1c30
 kernelmode_fixup_or_oops+0x68/0xf0
 __bad_area_nosemaphore+0x11a/0x780
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x30/0x90
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc90003a0fb18 EFLAGS: 00010206
RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc90003a0fb80
RBP: ffffc90003a0fd90 R08: ffffc90003a0fbb7 R09: 1ffff92000741f76
R10: dffffc0000000000 R11: fffff52000741f77 R12: ffffc90003a0fde0
R13: 1ffff92000741f6c R14: ffffc90003a0fb80 R15: 0000000000000000
 _copy_from_user+0x7a/0xb0
 ___sys_sendmsg+0x158/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f005118e9a9
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:00007f005207e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f00513b6080 RCX: 00007f005118e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000025
RBP: 00007f0051210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00513b6080 R15: 00007fff9a8fa708
 </TASK>
sched: DL replenish lagged too much
clocksource: Long readout interval, skipping watchdog check: cs_nsec: 105168669470 wd_nsec: 105168671878
