------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 19 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 1 PID: 19 at fs/buffer.c:1229 brelse include/linux/buffer_head.h:324 [inline]
WARNING: CPU: 1 PID: 19 at fs/buffer.c:1229 __invalidate_bh_lrus fs/buffer.c:1498 [inline]
WARNING: CPU: 1 PID: 19 at fs/buffer.c:1229 invalidate_bh_lru+0x102/0x1b0 fs/buffer.c:1511
Modules linked in:
CPU: 1 UID: 0 PID: 19 Comm: rcu_exp_gp_kthr Not tainted 6.12.0-next-20241122-syzkaller #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 include/linux/buffer_head.h:324 [inline]
RIP: 0010:__invalidate_bh_lrus fs/buffer.c:1498 [inline]
RIP: 0010:invalidate_bh_lru+0x102/0x1b0 fs/buffer.c:1511
Code: 44 ee da ff f0 ff 0b eb 25 e8 ba fa 6f ff 41 80 3c 2e 00 75 2a eb 30 e8 ac fa 6f ff 90 48 c7 c7 20 e1 18 8c e8 2f 99 30 ff 90 <0f> 0b 90 90 48 bd 00 00 00 00 00 fc ff df 41 80 3c 2e 00 74 08 4c
RSP: 0018:ffffc90000a18f30 EFLAGS: 00010046
RAX: afdf066f14dbf600 RBX: ffff8880725144e8 RCX: ffff88801ced3c00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81601b32 R09: 1ffff110170e519a
R10: dffffc0000000000 R11: ffffed10170e519b R12: ffff8880b8739838
R13: 0000000000000000 R14: 1ffff110170e7307 R15: ffff8880b8739838
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3c8e4ed58 CR3: 000000002fbf8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
csd_do_func kernel/smp.c:134 [inline]
__flush_smp_call_function_queue+0x3fc/0x1690 kernel/smp.c:540
__sysvec_call_function_single+0xb8/0x430 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x9e/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ae 59 3f f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 c3 71 a2 f5 65 8b 05 a4 c4 38 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90000187ba0 EFLAGS: 00000206
RAX: afdf066f14dbf600 RBX: 1ffff92000030f78 RCX: ffffffff817b230a
RDX: dffffc0000000000 RSI: ffffffff8c0a9640 RDI: 0000000000000001
RBP: ffffc90000187c30 R08: ffffffff9428a897 R09: 1ffffffff2851512
R10: dffffc0000000000 R11: fffffbfff2851513 R12: dffffc0000000000
R13: 1ffff92000030f74 R14: ffffc90000187bc0 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock+0x18c/0x1e0 kernel/sched/wait.c:108
rcu_exp_wait_wake kernel/rcu/tree_exp.h:696 [inline]
rcu_exp_sel_wait_wake+0x18bf/0x1dc0 kernel/rcu/tree_exp.h:712
kthread_worker_fn+0x500/0xb70 kernel/kthread.c:844
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
----------------
Code disassembly (best guess):
0: 9c pushf
1: 8f 44 24 20 pop 0x20(%rsp)
5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
a: 74 08 je 0x14
c: 4c 89 f7 mov %r14,%rdi
f: e8 ae 59 3f f6 call 0xf63f59c2
14: f6 44 24 21 02 testb $0x2,0x21(%rsp)
19: 75 52 jne 0x6d
1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 c3 71 a2 f5 call 0xf5a271f2 <-- trapping instruction
2f: 65 8b 05 a4 c4 38 74 mov %gs:0x7438c4a4(%rip),%eax # 0x7438c4da
36: 85 c0 test %eax,%eax
38: 74 43 je 0x7d
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss