------------[ cut here ]------------
virt_to_cache: Object is not a Slab page!
WARNING: CPU: 1 PID: 15735 at mm/slab.h:473 virt_to_cache mm/slab.h:473 [inline]
WARNING: CPU: 1 PID: 15735 at mm/slab.h:473 kfree+0x1d3/0x2c0 mm/slab.c:3748
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 15735 Comm: syz-executor.5 Not tainted 5.3.0-rc6-next-20190827 #74
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2dc/0x755 kernel/panic.c:220
 __warn.cold+0x2f/0x3c kernel/panic.c:581
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:virt_to_cache mm/slab.h:473 [inline]
RIP: 0010:kfree+0x1d3/0x2c0 mm/slab.c:3748
Code: 53 ff e9 67 fe ff ff 80 3d 5d e4 14 08 00 75 1c 48 c7 c6 a0 6c b5 87 48 c7 c7 d0 be a7 88 c6 05 46 e4 14 08 01 e8 d5 b8 96 ff <0f> 0b f6 c7 02 75 6d 48 83 3d 2e 23 46 07 00 0f 85 4b ff ff ff 0f
RSP: 0018:ffff888050857ad0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000282 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815bd606 RDI: ffffed100a10af4c
RBP: ffff888050857af0 R08: ffff88805cdfc100 R09: fffffbfff11f3a91
R10: fffffbfff11f3a90 R11: ffffffff88f9d483 R12: ffffffff81756100
R13: ffffffff829d0110 R14: ffff8880aa0ad940 R15: ffff88821b802ef0
 debugfs_release_dentry+0x60/0x80 fs/debugfs/inode.c:194
 __dentry_kill+0x3f7/0x600 fs/dcache.c:584
 shrink_dentry_list+0x152/0x4a0 fs/dcache.c:1120
 shrink_dcache_parent+0x23d/0x400 fs/dcache.c:1547
 do_one_tree+0x16/0x40 fs/dcache.c:1601
 shrink_dcache_for_umount+0x72/0x170 fs/dcache.c:1618
 generic_shutdown_super+0x6d/0x370 fs/super.c:445
 kill_anon_super+0x3e/0x60 fs/super.c:1104
 kill_litter_super+0x50/0x60 fs/super.c:1113
 deactivate_locked_super+0x95/0x100 fs/super.c:333
 deactivate_super fs/super.c:364 [inline]
 deactivate_super+0x1b2/0x1d0 fs/super.c:360
 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413561
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 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:00007ffc83116030 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000413561
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 0000000000000001 R08: 000000007e27c881 R09: 000000007e27c885
R10: 00007ffc83116110 R11: 0000000000000293 R12: 000000000075bf20
R13: 000000000005a5bf R14: 00000000007604f8 R15: ffffffffffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..