slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc_trace+0x2b7/0x3f0 mm/slab.c:3616
 kmalloc include/linux/slab.h:488 [inline]
 ext4_getfsmap_fill fs/ext4/fsmap.c:307 [inline]
 ext4_getfsmap_find_fixed_metadata+0xb0f/0x1690 fs/ext4/fsmap.c:455
 ext4_getfsmap_datadev+0x3e3/0x1150 fs/ext4/fsmap.c:518
------------[ cut here ]------------
 ext4_getfsmap+0x651/0x880 fs/ext4/fsmap.c:718
WARNING: CPU: 1 PID: 13678 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d fs/sysfs/dir.c:30
Kernel panic - not syncing: panic_on_warn set ...

 ext4_ioc_getfsmap+0x250/0x830 fs/ext4/ioctl.c:603
 ext4_ioctl+0x24b/0x39f0 fs/ext4/ioctl.c:663
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cb29
RSP: 002b:00007fcd51f63c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e61c0 RCX: 000000000045cb29
RDX: 00000000200004c0 RSI: 00000000c0c0583b RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 000000000000032a R14: 00000000004c5c57 R15: 00007fcd51f646d4
CPU: 1 PID: 13678 Comm: syz-executor.2 Not tainted 4.14.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x30 kernel/panic.c:547
 report_bug+0x20a/0x248 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d fs/sysfs/dir.c:30
RSP: 0018:ffff8880524c77c8 EFLAGS: 00010282
RAX: 000000000000004a RBX: ffff88808aaaee90 RCX: 0000000000000000
RDX: 000000000002b75f RSI: ffffffff81499420 RDI: ffffed100a498eef
RBP: ffff88805c546640 R08: 000000000000004a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a452cd20
R13: ffff8880a8b55040 R14: ffff88808aaaeea8 R15: ffff888097300bd8
 sysfs_create_dir_ns+0x16f/0x1d0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:71 [inline]
 kobject_add_internal+0x27f/0x830 lib/kobject.c:229
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x11f/0x180 lib/kobject.c:409
 device_add+0x361/0x13f0 drivers/base/core.c:1869
 device_create_groups_vargs+0x1dc/0x250 drivers/base/core.c:2513
 device_create_vargs+0x3a/0x50 drivers/base/core.c:2553
 bdi_register_va.part.0+0x35/0x650 mm/backing-dev.c:879
 bdi_register_va+0x63/0x80 mm/backing-dev.c:895
 super_setup_bdi_name+0x123/0x220 fs/super.c:1297
 fuse_bdi_init fs/fuse/inode.c:990 [inline]
 fuse_fill_super+0x92d/0x1620 fs/fuse/inode.c:1110
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x3c9/0x25e0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cb29
RSP: 002b:00007f618a473c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f7640 RCX: 000000000045cb29
RDX: 0000000020000100 RSI: 0000000020000200 RDI: 0000000020000180
RBP: 000000000078bf00 R08: 00000000200004c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000077c R14: 00000000004ca740 R15: 00007f618a4746d4
Kernel Offset: disabled
Rebooting in 86400 seconds..