3e1199dcad
In rare cases under heavy VMA pressure the ref count for a fscache cookie becomes corrupt. In this case we decrement ref count even if we fail before incrementing the refcount. FS-Cache: Assertion failed bnode-eca5f9c6/syslog 0 > 0 is false ------------[ cut here ]------------ kernel BUG at fs/fscache/cookie.c:519! invalid opcode: 0000 [#1] SMP Call Trace: [<ffffffffa01ba060>] __fscache_relinquish_cookie+0x50/0x220 [fscache] [<ffffffffa02d64ce>] ceph_fscache_unregister_inode_cookie+0x3e/0x50 [ceph] [<ffffffffa02ae1d3>] ceph_destroy_inode+0x33/0x200 [ceph] [<ffffffff811cf67e>] ? __fsnotify_inode_delete+0xe/0x10 [<ffffffff811a9e0c>] destroy_inode+0x3c/0x70 [<ffffffff811a9f51>] evict+0x111/0x180 [<ffffffff811aa763>] iput+0x103/0x190 [<ffffffff811a5de8>] __dentry_kill+0x1c8/0x220 [<ffffffff811a5f31>] shrink_dentry_list+0xf1/0x250 [<ffffffff811a762c>] prune_dcache_sb+0x4c/0x60 [<ffffffff811930af>] super_cache_scan+0xff/0x170 [<ffffffff8113d7a0>] shrink_slab_node+0x140/0x2c0 [<ffffffff8113f2da>] shrink_slab+0x8a/0x130 [<ffffffff81142572>] balance_pgdat+0x3e2/0x5d0 [<ffffffff811428ca>] kswapd+0x16a/0x4a0 [<ffffffff810a43f0>] ? __wake_up_sync+0x20/0x20 [<ffffffff81142760>] ? balance_pgdat+0x5d0/0x5d0 [<ffffffff81083e09>] kthread+0xc9/0xe0 [<ffffffff81010000>] ? ftrace_raw_event_xen_mmu_release_ptpage+0x70/0x90 [<ffffffff81083d40>] ? flush_kthread_worker+0xb0/0xb0 [<ffffffff8159f63c>] ret_from_fork+0x7c/0xb0 [<ffffffff81083d40>] ? flush_kthread_worker+0xb0/0xb0 RIP [<ffffffffa01b984b>] __fscache_disable_cookie+0x1db/0x210 [fscache] RSP <ffff8803bc85f9b8> ---[ end trace 254d0d7c74a01f25 ]--- Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: David Howells <dhowells@redhat.com> |
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| .. | ||
| cache.c | ||
| cookie.c | ||
| fsdef.c | ||
| histogram.c | ||
| internal.h | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| netfs.c | ||
| object-list.c | ||
| object.c | ||
| operation.c | ||
| page.c | ||
| proc.c | ||
| stats.c | ||