------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 5824 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 0 PID: 5824 at fs/buffer.c:1229 __brelse+0x6d/0xb0 fs/buffer.c:1223
Modules linked in:
CPU: 0 UID: 0 PID: 5824 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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 fb d5 79 ff 45 85 e4 75 20 e8 b1 d3 79 ff 90 48 c7 c7 e0 24 7f 8b e8 c4 0d 3a ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 96 d3 79 ff e8 91 d3 79 ff be 04 00 00
RSP: 0018:ffffc90000007f40 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff88806cf1fcb0 RCX: ffffffff815a5139
RDX: ffff88802fe19e00 RSI: ffffffff815a5146 RDI: 0000000000000001
RBP: ffff88806cf1fd10 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88806cf1fcb0 R14: dffffc0000000000 R15: ffffffff82204230
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd905fcbc8 CR3: 000000006b934000 CR4: 0000000000350ef0
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+0x27d/0x8c0 kernel/smp.c:540
 __sysvec_call_function_single+0x8c/0x410 arch/x86/kernel/smp.c:271
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x9f/0xc0 arch/x86/kernel/smp.c:266
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:unwind_next_frame+0x4e6/0x20c0 arch/x86/kernel/unwind_orc.c:505
Code: b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 4c 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 d8 13 00 00 0f b6 41 05 <83> e0 07 0f 84 61 fe ff ff 3c 01 0f 84 89 fe ff ff 4c 8d 49 04 4c
RSP: 0018:ffffc900030a7880 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff90f0a830
RDX: 0000000000000005 RSI: 0000000000000000 RDI: ffffffff906f4818
RBP: ffffc900030a7988 R08: ffffffff90f0a836 R09: ffffffff90f19ea0
R10: ffffc900030a799f R11: 000000000000406d R12: ffffc900030a7990
R13: ffffc900030a7940 R14: ffffc900030a7975 R15: ffffffff90f0a835
 __unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x74/0x100 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 save_stack+0x162/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x8d/0x400 mm/page_owner.c:297
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0x661/0x1080 mm/page_alloc.c:2659
 vfree+0x174/0x950 mm/vmalloc.c:3383
 kcov_put kernel/kcov.c:439 [inline]
 kcov_put+0x2a/0x40 kernel/kcov.c:435
 kcov_close+0xd/0x20 kernel/kcov.c:535
 __fput+0x3fb/0xb60 fs/file_table.c:450
 task_work_run+0x151/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xad8/0x2d70 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096
 x64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f031c185d29
Code: Unable to access opcode bytes at 0x7f031c185cff.
RSP: 002b:00007ffebde08e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f031c185d29
RDX: 00007f031c1847a0 RSI: 0000000000000004 RDI: 0000000000000001
RBP: 00007f031c376738 R08: 00007ffebde06bd7 R09: 0000000000000008
R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 4c 89 fa          	fisttps -0x6(%rcx,%rcx,4)
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
  14:	4c 89 fa             	mov    %r15,%rdx
  17:	83 e2 07             	and    $0x7,%edx
  1a:	38 d0                	cmp    %dl,%al
  1c:	7f 08                	jg     0x26
  1e:	84 c0                	test   %al,%al
  20:	0f 85 d8 13 00 00    	jne    0x13fe
  26:	0f b6 41 05          	movzbl 0x5(%rcx),%eax
* 2a:	83 e0 07             	and    $0x7,%eax <-- trapping instruction
  2d:	0f 84 61 fe ff ff    	je     0xfffffe94
  33:	3c 01                	cmp    $0x1,%al
  35:	0f 84 89 fe ff ff    	je     0xfffffec4
  3b:	4c 8d 49 04          	lea    0x4(%rcx),%r9
  3f:	4c                   	rex.WR