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Subject[PATCH] cachefiles: fix assertion failed after bmap
Date
From: Xiubo Li <xiubli@redhat.com>

<7>[ 333.227204] ceph: page/inode not in cache
<7>[ 333.571182] ceph: page/inode not in cache
<7>[ 333.741097] ceph: page/inode not in cache
<7>[ 337.977233] ceph: all-page read submitted
<7>[ 339.649714] ceph: all-page read submitted
<3>[ 339.654882] CacheFiles:
<3>[ 339.654952] CacheFiles: Assertion failed
<4>[ 339.655124] ------------[ cut here ]------------
<2>[ 339.655126] kernel BUG at fs/cachefiles/rdwr.c:434!
<4>[ 339.655225] invalid opcode: 0000 [#1] SMP KASAN PTI
<4>[ 339.655309] CPU: 0 PID: 3004 Comm: python2 Tainted: G E 5.6.0-rc6+ #77
<4>[ 339.655436] Hardware name: Red Hat RHEV Hypervisor, BIOS 1.11.0-2.el7 04/01/2014
<4>[ 339.655578] RIP: 0010:cachefiles_read_or_alloc_page.cold.19+0xa2/0xcd [cachefiles]
<4>[ 339.656007] RSP: 0018:ffff88838110f610 EFLAGS: 00010282
<4>[ 339.656095] RAX: 000000000000001c RBX: ffff88836e564600 RCX: 0000000000000001
<4>[ 339.656210] RDX: 0000000000000000 RSI: 0000000000000007 RDI: ffff888389c22bd0
<4>[ 339.656326] RBP: ffff88837b502e48 R08: ffffed107138457b R09: ffffed107138457b
<4>[ 339.656441] R10: ffffed107138457a R11: ffff888389c22bd3 R12: ffffea000d2dffc0
<4>[ 339.656563] R13: 0000000000000000 R14: ffff88835ef44700 R15: ffff88835ef44600
<4>[ 339.656679] FS: 00007fbb546c3740(0000) GS:ffff888389c00000(0000) knlGS:0000000000000000
<4>[ 339.656809] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 339.656902] CR2: 0000561ecd9c5108 CR3: 000000036c20a000 CR4: 00000000000406f0
<4>[ 339.657020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>[ 339.657136] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<4>[ 339.657251] Call Trace:
<4>[ 339.657322] ? fscache_run_op.isra.10+0x80/0x150 [fscache]
<4>[ 339.657421] ? cachefiles_read_copier+0x920/0x920 [cachefiles]
<4>[ 339.657529] ? fscache_wait_for_operation_activation+0xe2/0x310 [fscache]
<4>[ 339.657659] __fscache_read_or_alloc_page+0x3d2/0x520 [fscache]
<4>[ 339.657797] ceph_readpage_from_fscache+0x80/0x110 [ceph]
<4>[ 339.657915] ceph_do_readpage+0x1f3/0x660 [ceph]
<4>[ 339.657997] ? scan_shadow_nodes+0x50/0x50
<4>[ 339.658094] ? writepages_finish+0x700/0x700 [ceph]
<4>[ 339.658178] ? add_to_page_cache_lru+0x10e/0x190
<4>[ 339.658255] ? add_to_page_cache_locked+0x10/0x10
<4>[ 339.658361] ceph_readpage+0x12/0x40 [ceph]
<4>[ 339.658433] generic_file_buffered_read+0xa4e/0x1160
<4>[ 339.658517] ? read_cache_page_gfp+0x20/0x20
<4>[ 339.658599] ? down_read+0xe0/0x190
<4>[ 339.658661] ? unaccount_page_cache_page+0x2f0/0x2f0
<4>[ 339.658743] ? generic_file_read_iter+0x3b/0x220
<4>[ 339.658846] ceph_read_iter+0x321/0x1430 [ceph]
<4>[ 339.658923] ? avc_has_perm_noaudit+0x147/0x200
<4>[ 339.659027] ? ceph_direct_read_write+0xee0/0xee0 [ceph]
<4>[ 339.659115] ? perf_event_fork+0x20/0x20
<4>[ 339.659182] ? vma_wants_writenotify+0x6f/0x240
<4>[ 339.659257] ? __ia32_sys_mmap_pgoff+0x80/0x80
<4>[ 339.659334] ? __rb_insert_augmented+0x34/0x3f0
<4>[ 339.662451] ? vm_get_page_prot+0x60/0x60
<4>[ 339.665560] ? vma_set_page_prot+0xe5/0x100
<4>[ 339.668668] ? mmap_region+0x370/0xa60
<4>[ 339.671773] ? userfaultfd_unmap_complete+0x89/0x1e0
<4>[ 339.674900] ? new_sync_read+0x286/0x3b0
<4>[ 339.678011] new_sync_read+0x286/0x3b0
<4>[ 339.681102] ? __ia32_sys_llseek+0x1d0/0x1d0
<4>[ 339.684196] ? __fsnotify_parent+0x8d/0x1f0
<4>[ 339.687242] ? fsnotify+0x5c5/0x600
<4>[ 339.690224] ? __fsnotify_inode_delete+0x20/0x20
<4>[ 339.693188] ? avc_policy_seqno+0x22/0x30
<4>[ 339.696043] ? security_file_permission+0xe1/0x180
<4>[ 339.698821] vfs_read+0xaf/0x1b0
<4>[ 339.701518] ksys_read+0xb4/0x150
<4>[ 339.704177] ? kernel_write+0xb0/0xb0
<4>[ 339.706822] do_syscall_64+0x73/0x260
<4>[ 339.709427] entry_SYSCALL_64_after_hwframe+0x44/0xa9
<4>[ 339.712055] RIP: 0033:0x7fbb534eb950

Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
fs/cachefiles/rdwr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cachefiles/rdwr.c b/fs/cachefiles/rdwr.c
index 1dc97f2..073c14c 100644
--- a/fs/cachefiles/rdwr.c
+++ b/fs/cachefiles/rdwr.c
@@ -431,7 +431,7 @@ int cachefiles_read_or_alloc_page(struct fscache_retrieval *op,
block <<= shift;

ret = bmap(inode, &block);
- ASSERT(ret < 0);
+ ASSERT(!ret);

_debug("%llx -> %llx",
(unsigned long long) (page->index << shift),
--
1.8.3.1
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