------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at mm/slub.c:4550 slab_free_after_rcu_debug+0x18b/0x270 mm/slub.c:4550
Modules linked in:
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0-rc2-next-20240807-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:slab_free_after_rcu_debug+0x18b/0x270 mm/slub.c:4550
Code: 48 89 04 19 48 8d 4a 08 49 8b 34 24 65 48 0f c7 0e 75 c8 4c 89 f7 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 36 55 ff ff 90 <0f> 0b 90 eb 92 90 0f 0b 90 eb 8c 90 0f 0b 90 eb 86 41 8b 54 24 1c
RSP: 0000:ffffc90000007bc0 EFLAGS: 00010286
RAX: ffff88823be00000 RBX: ffff888020ec8280 RCX: 000000000004efe0
RDX: ffffea0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007e30 R08: ffffffff8142d3dc R09: 1ffffffff26e96f3
R10: dffffc0000000000 R11: ffffffff81f100d0 R12: dffffc0000000000
R13: ffffffff817bf146 R14: ffff88823be4efe0 R15: ffffea000083b200
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000e734000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_do_batch kernel/rcu/tree.c:2569 [inline]
 rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x9f7/0xf50 kernel/printk/printk.c:3103
Code: 20 00 90 0f 0b 90 e9 f3 f9 ff ff e8 03 0f 20 00 e8 7e 4d 49 0a 4d 85 f6 74 c0 e8 f4 0e 20 00 fb 49 bd 00 00 00 00 00 fc ff df <43> 80 3c 2f 00 48 8b 5c 24 30 74 08 48 89 df e8 b5 64 88 00 4c 8b
RSP: 0000:ffffc90000067400 EFLAGS: 00000293
RAX: ffffffff8173f26c RBX: 0000000000000000 RCX: ffff8880176f0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000067590 R08: ffffffff8173f213 R09: 1ffffffff26e96f0
R10: dffffc0000000000 R11: fffffbfff26e96f1 R12: ffffffff8f139ee0
R13: dffffc0000000000 R14: 0000000000000200 R15: 1ffffffff1e273e7
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3173
 vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
 _printk+0xd5/0x120 kernel/printk/printk.c:2450
 usb_serial_register drivers/usb/serial/usb-serial.c:1444 [inline]
 __usb_serial_register_drivers+0x7a9/0xe00 drivers/usb/serial/usb-serial.c:1519
 do_one_initcall+0x248/0x880 init/main.c:1267
 do_initcall_level+0x157/0x210 init/main.c:1329
 do_initcalls+0x3f/0x80 init/main.c:1345
 kernel_init_freeable+0x435/0x5d0 init/main.c:1578
 kernel_init+0x1d/0x2b0 init/main.c:1467
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
----------------
Code disassembly (best guess):
   0:	20 00                	and    %al,(%rax)
   2:	90                   	nop
   3:	0f 0b                	ud2
   5:	90                   	nop
   6:	e9 f3 f9 ff ff       	jmp    0xfffff9fe
   b:	e8 03 0f 20 00       	call   0x200f13
  10:	e8 7e 4d 49 0a       	call   0xa494d93
  15:	4d 85 f6             	test   %r14,%r14
  18:	74 c0                	je     0xffffffda
  1a:	e8 f4 0e 20 00       	call   0x200f13
  1f:	fb                   	sti
  20:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  27:	fc ff df
* 2a:	43 80 3c 2f 00       	cmpb   $0x0,(%r15,%r13,1) <-- trapping instruction
  2f:	48 8b 5c 24 30       	mov    0x30(%rsp),%rbx
  34:	74 08                	je     0x3e
  36:	48 89 df             	mov    %rbx,%rdi
  39:	e8 b5 64 88 00       	call   0x8864f3
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b