------------[ cut here ]------------
task_rq(p) != rq
WARNING: kernel/sched/fair.c:7656 at hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656, CPU#0: syz.0.39/5969
Modules linked in:
CPU: 0 UID: 0 PID: 5969 Comm: syz.0.39 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656
Code: 42 80 3c 20 00 74 08 4c 89 ff e8 85 f5 97 00 4d 39 37 0f 85 0c ff ff ff 48 89 df 5b 41 5c 41 5d 41 5e 41 5f e9 7b 64 fa ff 90 <0f> 0b 90 e9 d1 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 82
RSP: 0018:ffffc900015bf9a0 EFLAGS: 00010087
RAX: ffff8880b873ba40 RBX: ffff8880b863ba40 RCX: ffffffff8197d8ae
RDX: 0000000000000000 RSI: ffff888029f6dd00 RDI: ffff8880b863ba40
RBP: dffffc0000000000 R08: ffffffff8fcf390f R09: 1ffffffff1f9e721
R10: dffffc0000000000 R11: fffffbfff1f9e722 R12: dffffc0000000000
R13: 1ffff110170c78d6 R14: ffff888029f6dd00 R15: ffffffff8dc257d8
FS:  000055557b513500(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0efc667dac CR3: 00000000421e2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 set_next_task_fair+0xa68/0xce0 kernel/sched/fair.c:15065
 put_prev_set_next_task kernel/sched/sched.h:2770 [inline]
 pick_next_task kernel/sched/core.c:6442 [inline]
 __schedule+0x3e03/0x5550 kernel/sched/core.c:7143
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7409
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 class_preempt_destructor include/linux/preempt.h:468 [inline]
 __migrate_enable include/linux/sched.h:2465 [inline]
 migrate_enable include/linux/sched.h:2505 [inline]
 rt_read_unlock+0xf0/0x220 kernel/locking/spinlock_rt.c:264
 read_unlock include/linux/rwlock_rt.h:66 [inline]
 sched_core_share_pid+0x68f/0x7b0 kernel/sched/core_sched.c:231
 __do_sys_prctl kernel/sys.c:2808 [inline]
 __se_sys_prctl+0x866/0x1910 kernel/sys.c:2534
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0efc3ece59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc651a94b8 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f0efc665fa0 RCX: 00007f0efc3ece59
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f0efc482d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0efc665fac R14: 00007f0efc665fa0 R15: 00007f0efc665fa0
 </TASK>