------------[ cut here ]------------
kernel BUG at mm/slab.c:2954!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7627 Comm: syz-executor4 Not tainted 5.0.0-rc4+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:alloc_block mm/slab.c:2954 [inline]
RIP: 0010:cache_alloc_refill mm/slab.c:3013 [inline]
RIP: 0010:____cache_alloc mm/slab.c:3116 [inline]
RIP: 0010:____cache_alloc mm/slab.c:3099 [inline]
RIP: 0010:__do_cache_alloc mm/slab.c:3338 [inline]
RIP: 0010:slab_alloc mm/slab.c:3373 [inline]
RIP: 0010:kmem_cache_alloc+0x613/0x710 mm/slab.c:3541
Code: 45 c8 4c 89 62 08 48 89 53 08 48 89 4b 10 4c 89 60 48 41 f6 45 23 40 0f 84 3a ff ff ff 48 c7 43 20 00 00 00 00 e9 2d ff ff ff <0f> 0b 0f 0b c7 46 0c 01 00 00 00 e9 42 ff ff ff 0f 1f 44 00 00 8b
RSP: 0018:ffff88806e86fd18 EFLAGS: 00010086
RAX: 0000000000000001 RBX: ffffea00029a9980 RCX: ffffffff81a6ab96
RDX: ffff8880aa567838 RSI: 0000000000000004 RDI: ffff8880aa567800
RBP: ffff88806e86fd80 R08: 1ffff110154acf00 R09: ffffed10154acf01
R10: ffffed10154acf00 R11: ffff8880aa567803 R12: ffff88821bc45380
R13: ffff88821bc45380 R14: 0000000000000004 R15: ffffe8ffffd04460
FS:  000000000132b940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffce0774938 CR3: 00000000984e5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 getname_flags fs/namei.c:140 [inline]
 getname_flags+0xd6/0x5b0 fs/namei.c:129
 getname fs/namei.c:211 [inline]
 user_path_mountpoint_at+0x29/0x50 fs/namei.c:2747
 ksys_umount+0x164/0xe70 fs/namespace.c:1643
 __do_sys_umount fs/namespace.c:1669 [inline]
 __se_sys_umount fs/namespace.c:1667 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1667
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a887
Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8e fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d 8e fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffce0774938 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000055197 RCX: 000000000045a887
RDX: 000000000000000c RSI: 0000000000000002 RDI: 00007ffce0775a70
RBP: 00000000000004c4 R08: 0000000000000001 R09: 000000000132b940
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce0775a70
R13: 000000000005515d R14: 0000000000000000 R15: 0000000000000004
Modules linked in:
---[ end trace f8f4102d99c56e32 ]---
RIP: 0010:alloc_block mm/slab.c:2954 [inline]
RIP: 0010:cache_alloc_refill mm/slab.c:3013 [inline]
RIP: 0010:____cache_alloc mm/slab.c:3116 [inline]
RIP: 0010:____cache_alloc mm/slab.c:3099 [inline]
RIP: 0010:__do_cache_alloc mm/slab.c:3338 [inline]
RIP: 0010:slab_alloc mm/slab.c:3373 [inline]
RIP: 0010:kmem_cache_alloc+0x613/0x710 mm/slab.c:3541
Code: 45 c8 4c 89 62 08 48 89 53 08 48 89 4b 10 4c 89 60 48 41 f6 45 23 40 0f 84 3a ff ff ff 48 c7 43 20 00 00 00 00 e9 2d ff ff ff <0f> 0b 0f 0b c7 46 0c 01 00 00 00 e9 42 ff ff ff 0f 1f 44 00 00 8b
RSP: 0018:ffff88806e86fd18 EFLAGS: 00010086
RAX: 0000000000000001 RBX: ffffea00029a9980 RCX: ffffffff81a6ab96
RDX: ffff8880aa567838 RSI: 0000000000000004 RDI: ffff8880aa567800
RBP: ffff88806e86fd80 R08: 1ffff110154acf00 R09: ffffed10154acf01
R10: ffffed10154acf00 R11: ffff8880aa567803 R12: ffff88821bc45380
R13: ffff88821bc45380 R14: 0000000000000004 R15: ffffe8ffffd04460
FS:  000000000132b940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffce0774938 CR3: 00000000984e5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400