sched: DL replenish lagged too much
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6783 at kernel/rcu/tree_stall.h:989 rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:989
Modules linked in:
CPU: 1 UID: 0 PID: 6783 Comm: syz.0.297 Not tainted 6.14.0-rc3-syzkaller-g9aa8fe29f624 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2cf/0x460 kernel/rcu/tree_stall.h:989
Code: c7 e0 8e 6c 9a be 04 00 00 00 e8 ec 08 82 00 b8 01 00 00 00 87 05 41 84 c3 18 85 c0 0f 85 1a ff ff ff 48 c7 c0 00 40 b4 8e 90 <0f> 0b 90 49 39 c7 74 47 48 c7 c0 30 c8 3e 90 48 c1 e8 03 42 0f b6
RSP: 0018:ffffc90000a18bb8 EFLAGS: 00010046
RAX: ffffffff8eb44000 RBX: 00000000ffffe446 RCX: ffffffff81a90a94
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9a6c8ee0
RBP: ffffc90000a18e10 R08: 0000000000000003 R09: fffffbfff34d91dc
R10: dffffc0000000000 R11: fffffbfff34d91dc R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8eb44000
FS:  000055556c65d500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000032f48000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x650/0x17a0 kernel/rcu/tree.c:2797
 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738
RIP: 0010:rcu_read_unlock_special+0x88/0x570 kernel/rcu/tree_plugin.h:694
Code: f1 f1 f1 00 f2 f2 f2 49 89 04 14 66 41 c7 44 14 09 f3 f3 41 c6 44 14 0b f3 65 44 8b 3d f9 97 5a 7e 41 f7 c7 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 22 00 00 00 00 66 42 c7 44 22
RSP: 0018:ffffc900041efc40 EFLAGS: 00000206
RAX: e4246a9ac06e6b00 RBX: 1ffff9200083df90 RCX: ffffffff819e7c9a
RDX: dffffc0000000000 RSI: ffffffff8c2afd00 RDI: ffffffff8c8143c0
RBP: ffffc900041efd08 R08: ffffffff9457ece7 R09: 1ffffffff28afd9c
R10: dffffc0000000000 R11: fffffbfff28afd9d R12: 1ffff9200083df8c
R13: ffff8880261e2260 R14: ffffc900041efc80 R15: 0000000000000000
 __rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:438
 dput+0x197/0x2b0 fs/dcache.c:884
 __fput+0x60b/0x9f0 fs/file_table.c:472
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb09b78d169
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:00007ffe0ddd9408 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000001ec21 RCX: 00007fb09b78d169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb09b9a7ba0 R08: 0000000000000001 R09: 0000000a0ddd96ff
R10: 00007fb09b600000 R11: 0000000000000246 R12: 00007fb09b9a5fac
R13: 00007fb09b9a5fa0 R14: ffffffffffffffff R15: 00007ffe0ddd9520
 </TASK>
----------------
Code disassembly (best guess):
   0:	f1                   	int1
   1:	f1                   	int1
   2:	f1                   	int1
   3:	00 f2                	add    %dh,%dl
   5:	f2 f2 49 89 04 14    	repnz repnz mov %rax,(%r12,%rdx,1)
   b:	66 41 c7 44 14 09 f3 	movw   $0xf3f3,0x9(%r12,%rdx,1)
  12:	f3
  13:	41 c6 44 14 0b f3    	movb   $0xf3,0xb(%r12,%rdx,1)
  19:	65 44 8b 3d f9 97 5a 	mov    %gs:0x7e5a97f9(%rip),%r15d        # 0x7e5a981a
  20:	7e
  21:	41 f7 c7 00 00 f0 00 	test   $0xf00000,%r15d
  28:	74 49                	je     0x73
* 2a:	48 c7 44 24 20 0e 36 	movq   $0x45e0360e,0x20(%rsp) <-- trapping instruction
  31:	e0 45
  33:	4a c7 04 22 00 00 00 	movq   $0x0,(%rdx,%r12,1)
  3a:	00
  3b:	66                   	data16
  3c:	42                   	rex.X
  3d:	c7                   	.byte 0xc7
  3e:	44                   	rex.R
  3f:	22                   	.byte 0x22