------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 0 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 0 PID: 0 at fs/buffer.c:1229 __brelse+0x6d/0xb0 fs/buffer.c:1223
Modules linked in:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.14.0-rc2-syzkaller-ga64dcfb451e2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__brelse fs/buffer.c:1229 [inline]
RIP: 0010:__brelse+0x6d/0xb0 fs/buffer.c:1223
Code: 84 d2 75 52 44 8b 63 60 31 ff 44 89 e6 e8 9b 5b 78 ff 45 85 e4 75 20 e8 91 60 78 ff 90 48 c7 c7 e0 8f 7f 8b e8 64 9c 38 ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 76 60 78 ff e8 71 60 78 ff be 04 00 00
RSP: 0018:ffffc90000007f40 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff888035dfe740 RCX: ffffffff817a1159
RDX: ffffffff8de97740 RSI: ffffffff817a1166 RDI: 0000000000000001
RBP: ffff888035dfe7a0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888035dfe740 R14: dffffc0000000000 R15: ffffffff824173b0
FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e1180f000 CR3: 000000003197a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 brelse include/linux/buffer_head.h:324 [inline]
 __invalidate_bh_lrus fs/buffer.c:1498 [inline]
 invalidate_bh_lru+0xa2/0x190 fs/buffer.c:1511
 csd_do_func kernel/smp.c:134 [inline]
 __flush_smp_call_function_queue+0x27a/0x8c0 kernel/smp.c:540
 __sysvec_call_function+0x8c/0x410 arch/x86/kernel/smp.c:262
 instr_sysvec_call_function arch/x86/kernel/smp.c:257 [inline]
 sysvec_call_function+0x9f/0xc0 arch/x86/kernel/smp.c:257
 </IRQ>
 <TASK>
 asm_sysvec_call_function+0x1a/0x20 arch/x86/include/asm/idtentry.h:710
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:default_idle+0xf/0x20 arch/x86/kernel/process.c:744
Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 13 20 10 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffffff8de07e20 EFLAGS: 00000206
RAX: 00000000000a6bcf RBX: 0000000000000000 RCX: ffffffff8b567469
RDX: 0000000000000000 RSI: ffffffff8b6ced20 RDI: ffffffff8bd34e00
RBP: fffffbfff1bd2ee8 R08: 0000000000000001 R09: ffffed100d4c6f85
R10: ffff88806a637c2b R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8de97740 R14: ffffffff90623610 R15: 0000000000000000
 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x329/0x3f0 kernel/sched/idle.c:325
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
 rest_init+0x16b/0x2b0 init/main.c:743
 start_kernel+0x3e9/0x4d0 init/main.c:1099
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:515
 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:496
 common_startup_64+0x13e/0x148
 </TASK>
----------------
Code disassembly (best guess):
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d 13 20 10 00 	verw   0x102013(%rip)        # 0x10203b
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	fa                   	cli <-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop