syzbot

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kernel BUG at mm/slub.c:3934!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 8813 Comm: syz-executor1 Not tainted 4.18.0-rc8+ #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kfree+0x1b7a/0x29d0 mm/slub.c:3934
Code: ff ff 8b bd 4c ff ff ff e8 03 8f 02 00 84 db 0f 85 f9 eb ff ff e9 d7 f9 ff ff 8b 3a e8 ef 8e 02 00 4d 85 f6 0f 85 91 ec ff ff <0f> 0b eb fe 44 89 ef e8 da 8e 02 00 e9 4b ec ff ff 48 8b 85 70 ff 
RSP: 0018:ffff8800aa5ffa80 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0006000000 RCX: 0000000000000000
RDX: ffffffff8a1af000 RSI: 0000000000000001 RDI: ffffea0006000008
RBP: ffff8800aa5ffbd8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 000000008080003e R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead0000000000ff
FS:  0000000001e03940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c250e CR3: 0000000168df6000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 kvfree+0xe4/0x100 mm/util.c:442
 __free_fdtable fs/file.c:31 [inline]
 put_files_struct+0x457/0x540 fs/file.c:420
 exit_files+0xef/0x150 fs/file.c:445
 do_exit+0xf4e/0x3890 kernel/exit.c:862
 do_group_exit+0x1a0/0x350 kernel/exit.c:970
 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979
 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979
 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:0000000000a3fda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000457089
RDX: 0000000000410c41 RSI: fffffffffffffff7 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000000000c2a2e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00000000000c2a2e R14: 00000000000004be R15: badc0ffeebadface
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace e3d5025f614fca42 ]---
RIP: 0010:kfree+0x1b7a/0x29d0 mm/slub.c:3934
Code: ff ff 8b bd 4c ff ff ff e8 03 8f 02 00 84 db 0f 85 f9 eb ff ff e9 d7 f9 ff ff 8b 3a e8 ef 8e 02 00 4d 85 f6 0f 85 91 ec ff ff <0f> 0b eb fe 44 89 ef e8 da 8e 02 00 e9 4b ec ff ff 48 8b 85 70 ff 
RSP: 0018:ffff8800aa5ffa80 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0006000000 RCX: 0000000000000000
RDX: ffffffff8a1af000 RSI: 0000000000000001 RDI: ffffea0006000008
RBP: ffff8800aa5ffbd8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 000000008080003e R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead0000000000ff
FS:  0000000001e03940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c250e CR3: 0000000009830000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600