------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 1093 at fs/buffer.c:1235 __brelse fs/buffer.c:1235 [inline]
WARNING: CPU: 1 PID: 1093 at fs/buffer.c:1235 __brelse+0x6d/0xb0 fs/buffer.c:1229
Modules linked in:
CPU: 1 PID: 1093 Comm: kworker/u32:7 Not tainted 6.9.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:__brelse fs/buffer.c:1235 [inline]
RIP: 0010:__brelse+0x6d/0xb0 fs/buffer.c:1229
Code: 84 d2 75 52 44 8b 63 60 31 ff 44 89 e6 e8 bb ac 82 ff 45 85 e4 75 20 e8 d1 b1 82 ff 90 48 c7 c7 20 f3 1d 8b e8 54 20 45 ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 b6 b1 82 ff e8 b1 b1 82 ff be 04 00 00
RSP: 0018:ffffc900008a0f40 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff88804807f3a0 RCX: ffffffff81503349
RDX: ffff888023250000 RSI: ffffffff81503356 RDI: 0000000000000001
RBP: ffff88804807f400 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
R13: ffff88804807f3a0 R14: dffffc0000000000 R15: ffffffff820b11b0
FS: 0000000000000000(0000) GS:ffff88806b300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f834f80f000 CR3: 000000001eec0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
brelse include/linux/buffer_head.h:309 [inline]
__invalidate_bh_lrus fs/buffer.c:1487 [inline]
invalidate_bh_lru+0xa2/0x190 fs/buffer.c:1500
csd_do_func kernel/smp.c:133 [inline]
__flush_smp_call_function_queue+0x27a/0x8c0 kernel/smp.c:511
__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+0x90/0xb0 arch/x86/kernel/smp.c:257
asm_sysvec_call_function+0x1a/0x20 arch/x86/include/asm/idtentry.h:710
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 fa 9e 96 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000415f980 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200082bf32 RCX: 000000002ce2c1f7
RDX: 0000000000000001 RSI: ffffffff8b0cb0e0 RDI: ffffffff8b6f4de0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27ba430
R10: ffffffff93dd2187 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8d7b0e20 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
inet_twsk_purge+0x126/0x8f0 net/ipv4/inet_timewait_sock.c:277
tcp_twsk_purge+0x125/0x170 net/ipv4/tcp_minisocks.c:401
ops_exit_list+0x128/0x180 net/core/net_namespace.c:175
cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:637
process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
----------------
Code disassembly (best guess):
0: c1 05 fa 9e 96 7e 83 roll $0x83,0x7e969efa(%rip) # 0x7e969f01
7: f8 clc
8: 01 0f add %ecx,(%rdi)
a: 85 ea test %ebp,%edx
c: 02 00 add (%rax),%al
e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2)
15: 85 d5 test %edx,%ebp
17: 02 00 add (%rax),%al
19: 00 48 85 add %cl,-0x7b(%rax)
1c: ed in (%dx),%eax
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24