------------[ cut here ]------------
kernel BUG at mm/slub.c:3934!
invalid opcode: 0000 [#1] SMP PTI
CPU: 0 PID: 6925 Comm: syz-executor0 Not tainted 4.18.0-rc4+ #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kfree+0x1ad4/0x2ac0 mm/slub.c:3934
Code: ff 8b bd 44 ff ff ff e8 5a a4 02 00 45 84 f6 0f 85 ed ec ff ff e9 01 fb ff ff 8b 3a e8 45 a4 02 00 48 85 db 0f 85 96 ed ff ff <0f> 0b eb fe 44 89 ef e8 30 a4 02 00 48 8b bd 68 ff ff ff e9 52 ed 
RSP: 0018:ffff88009ceff970 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8ba11000 RSI: 0000000000000001 RDI: ffffea0006000008
RBP: ffff88009ceffac0 R08: 0000000000000000 R09: 000077ff80000000
R10: 0000000000000000 R11: ffffffff81e5b650 R12: ffffea0006000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead0000000000ff
FS:  0000000001d13940(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30621000 CR3: 0000000099760000 CR4: 00000000001406f0
DR0: 00000000200001c0 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 free_pipe_info+0x447/0x460 fs/pipe.c:684
 put_pipe_info fs/pipe.c:556 [inline]
 pipe_release+0x462/0x5a0 fs/pipe.c:577
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:166 [inline]
 prepare_exit_to_usermode+0x35d/0x430 arch/x86/entry/common.c:197
 syscall_return_slowpath+0x108/0x800 arch/x86/entry/common.c:268
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x40ff01
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 
RSP: 002b:0000000000a3eab0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000016 RCX: 000000000040ff01
RDX: fffffffffffffff7 RSI: 00000000007303d8 RDI: 0000000000000015
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000021
R10: 0000000000a3e930 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000a3f160 R15: 00000000007034c0
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 4c9e9e430a8bd05f ]---
RIP: 0010:kfree+0x1ad4/0x2ac0 mm/slub.c:3934
Code: ff 8b bd 44 ff ff ff e8 5a a4 02 00 45 84 f6 0f 85 ed ec ff ff e9 01 fb ff ff 8b 3a e8 45 a4 02 00 48 85 db 0f 85 96 ed ff ff <0f> 0b eb fe 44 89 ef e8 30 a4 02 00 48 8b bd 68 ff ff ff e9 52 ed 
RSP: 0018:ffff88009ceff970 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8ba11000 RSI: 0000000000000001 RDI: ffffea0006000008
RBP: ffff88009ceffac0 R08: 0000000000000000 R09: 000077ff80000000
R10: 0000000000000000 R11: ffffffff81e5b650 R12: ffffea0006000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead0000000000ff
FS:  0000000001d13940(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30621000 CR3: 0000000099760000 CR4: 00000000001406f0
DR0: 00000000200001c0 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600