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Subjectfscache kasan splat on v4.17-rc3
[   46.333213] ==================================================================
[ 46.336298] BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x129/0x310
[ 46.338208] Read of size 4 at addr ffff8803ea90261c by task mount.nfs/839

[ 46.342780] CPU: 2 PID: 839 Comm: mount.nfs Not tainted 4.17.0-rc3-backup-debug+ #1
[ 46.342783] Hardware name: ASUS All Series/Z97-DELUXE, BIOS 2602 08/18/2015
[ 46.342784] Call Trace:
[ 46.342790] dump_stack+0x74/0xbb
[ 46.342795] print_address_description+0x9b/0x2b0
[ 46.342797] kasan_report+0x258/0x380
[ 46.355407] ? fscache_alloc_cookie+0x129/0x310
[ 46.355410] fscache_alloc_cookie+0x129/0x310
[ 46.355413] __fscache_acquire_cookie+0xd2/0x570
[ 46.355417] nfs_fscache_get_client_cookie+0x206/0x220
[ 46.355419] ? nfs_readpage_from_fscache_complete+0xa0/0xa0
[ 46.355422] ? rcu_read_lock_sched_held+0x8a/0xa0
[ 46.355426] ? memcpy+0x34/0x50
[ 46.355428] nfs_alloc_client+0x1d9/0x1f0
[ 46.371854] nfs4_alloc_client+0x22/0x420
[ 46.371857] nfs_get_client+0x47d/0x8f0
[ 46.371860] ? pcpu_alloc+0x599/0xaf0
[ 46.371862] nfs4_set_client+0x155/0x1e0
[ 46.371865] ? nfs4_check_serverowner_major_id+0x50/0x50
[ 46.371867] nfs4_create_server+0x261/0x4e0
[ 46.371870] ? nfs4_set_ds_client+0x200/0x200
[ 46.371872] ? alloc_vfsmnt+0xa6/0x360
[ 46.371875] ? __lockdep_init_map+0xaa/0x290
[ 46.371878] nfs4_remote_mount+0x31/0x60
[ 46.371880] mount_fs+0x2f/0xd0
[ 46.371884] vfs_kern_mount+0x68/0x200
[ 46.396948] nfs_do_root_mount+0x7f/0xc0
[ 46.396952] ? do_raw_spin_unlock+0xa2/0x130
[ 46.396954] nfs4_try_mount+0x7f/0x110
[ 46.396957] nfs_fs_mount+0xca5/0x1450
[ 46.396960] ? pcpu_alloc+0x599/0xaf0
[ 46.396962] ? nfs_remount+0x8a0/0x8a0
[ 46.396964] ? mark_held_locks+0x1c/0xb0
[ 46.396967] ? __raw_spin_lock_init+0x1c/0x70
[ 46.412631] ? trace_hardirqs_on_caller+0x187/0x260
[ 46.412633] ? nfs_clone_super+0x150/0x150
[ 46.412635] ? nfs_destroy_inode+0x20/0x20
[ 46.412637] ? __lockdep_init_map+0xaa/0x290
[ 46.412639] ? __lockdep_init_map+0xaa/0x290
[ 46.412641] ? mount_fs+0x2f/0xd0
[ 46.412642] mount_fs+0x2f/0xd0
[ 46.412645] vfs_kern_mount+0x68/0x200
[ 46.412648] ? do_raw_read_unlock+0x28/0x50
[ 46.412651] do_mount+0x2ac/0x14f0
[ 46.412653] ? copy_mount_string+0x20/0x20
[ 46.431590] ? copy_mount_options+0xe6/0x1b0
[ 46.431592] ? copy_mount_options+0x100/0x1b0
[ 46.431594] ? copy_mount_options+0xe6/0x1b0
[ 46.431596] ksys_mount+0x7e/0xd0
[ 46.431599] __x64_sys_mount+0x62/0x70
[ 46.431601] do_syscall_64+0xc7/0x8a0
[ 46.431603] ? syscall_return_slowpath+0x3c0/0x3c0
[ 46.431605] ? mark_held_locks+0x1c/0xb0
[ 46.431609] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[ 46.431611] ? trace_hardirqs_off_caller+0xc2/0x110
[ 46.431613] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 46.431615] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 46.431617] RIP: 0033:0x7f546ceb97fa
[ 46.431619] RSP: 002b:00007ffdf1c9d078 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
[ 46.431622] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f546ceb97fa
[ 46.431623] RDX: 000055decf202b20 RSI: 000055decf202b40 RDI: 000055decf204850
[ 46.431625] RBP: 00007ffdf1c9d1d0 R08: 000055decf206680 R09: 62353a303036343a
[ 46.431626] R10: 0000000000000c00 R11: 0000000000000206 R12: 00007ffdf1c9d1d0
[ 46.431627] R13: 000055decf205870 R14: 000000000000001c R15: 00007ffdf1c9d0e0

[ 46.431631] Allocated by task 839:
[ 46.431634] kasan_kmalloc+0xa0/0xd0
[ 46.431636] __kmalloc+0x156/0x350
[ 46.431639] fscache_alloc_cookie+0x2e4/0x310
[ 46.431640] __fscache_acquire_cookie+0xd2/0x570
[ 46.431643] nfs_fscache_get_client_cookie+0x206/0x220
[ 46.431645] nfs_alloc_client+0x1d9/0x1f0
[ 46.431648] nfs4_alloc_client+0x22/0x420
[ 46.431650] nfs_get_client+0x47d/0x8f0
[ 46.431652] nfs4_set_client+0x155/0x1e0
[ 46.431653] nfs4_create_server+0x261/0x4e0
[ 46.431655] nfs4_remote_mount+0x31/0x60
[ 46.431657] mount_fs+0x2f/0xd0
[ 46.431659] vfs_kern_mount+0x68/0x200
[ 46.431662] nfs_do_root_mount+0x7f/0xc0
[ 46.484441] nfs4_try_mount+0x7f/0x110
[ 46.484443] nfs_fs_mount+0xca5/0x1450
[ 46.484445] mount_fs+0x2f/0xd0
[ 46.484447] vfs_kern_mount+0x68/0x200
[ 46.484449] do_mount+0x2ac/0x14f0
[ 46.484451] ksys_mount+0x7e/0xd0
[ 46.484452] __x64_sys_mount+0x62/0x70
[ 46.484455] do_syscall_64+0xc7/0x8a0
[ 46.484458] entry_SYSCALL_64_after_hwframe+0x49/0xbe

[ 46.484461] Freed by task 407:
[ 46.499159] __kasan_slab_free+0x11d/0x160
[ 46.499161] kfree+0xe5/0x320
[ 46.499163] kobject_uevent_env+0x1ab/0x760
[ 46.499165] kobject_synth_uevent+0x470/0x4e0
[ 46.499168] uevent_store+0x1c/0x40
[ 46.499171] kernfs_fop_write+0x196/0x230
[ 46.499174] __vfs_write+0xc5/0x310
[ 46.499175] vfs_write+0xfb/0x250
[ 46.499177] ksys_write+0xa7/0x130
[ 46.499180] do_syscall_64+0xc7/0x8a0
[ 46.512915] entry_SYSCALL_64_after_hwframe+0x49/0xbe

[ 46.512921] The buggy address belongs to the object at ffff8803ea902608
which belongs to the cache kmalloc-32 of size 32
[ 46.512924] The buggy address is located 20 bytes inside of
32-byte region [ffff8803ea902608, ffff8803ea902628)
[ 46.512926] The buggy address belongs to the page:
[ 46.512930] page:ffffea000faa4080 count:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
[ 46.522527] flags: 0x8000000000008100(slab|head)
[ 46.522530] raw: 8000000000008100 0000000000000000 0000000000000000 0000000100150015
[ 46.522532] raw: ffffea000facb320 ffffea000fac8520 ffff880107c0c5c0 0000000000000000
[ 46.522534] page dumped because: kasan: bad access detected

[ 46.522535] Memory state around the buggy address:
[ 46.522537] ffff8803ea902500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 46.522539] ffff8803ea902580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 46.522541] >ffff8803ea902600: fc 00 00 06 fc fc fc fc fc fc fc fc fc fc fc fc
[ 46.522542] ^
[ 46.522543] ffff8803ea902680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 46.522545] ffff8803ea902700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 46.522547] ==================================================================

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