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Subjectf2fs: f2fs unmount hangs if f2fs_init_acl() fails during mkdir syscall
Hello,

Testing f2fs (of linux-3.13) under fault simulation, we detected
umount() hangs up after
mkdir()->
f2fs_add_link()->
init_inode_metadata()->
f2fs_init_acl()->
f2fs_get_acl()->
f2fs_getxattr()->
read_all_xattrs() fails.

Also there was a BUG_ON triggered after the fault in
mkdir()->
f2fs_add_link()->
init_inode_metadata()->
remove_inode_page() ->
f2fs_bug_on(inode->i_blocks != 0 && inode->i_blocks != 1);

In this case there are 2 blocks allocated, which are counted with
inode->i_blocks field:

static struct page *init_inode_metadata(struct inode *inode,
struct inode *dir, const struct qstr *name)
{
struct page *page;
int err;

if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
page = new_inode_page(inode, name); <----- First block is
allocated for the inode
if (IS_ERR(page))
return page;

if (S_ISDIR(inode->i_mode)) {
err = make_empty_dir(inode, dir, page); <----- Second block
is allocated for the inode
if (err)
goto error;
}

err = f2fs_init_acl(inode, dir, page); <----- This call returns
error
if (err)
goto error;
...
} else {
...
}

init_dent_inode(name, page);

/*
* This file should be checkpointed during fsync.
* We lost i_pino from now on.
*/
if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
file_lost_pino(inode);
inc_nlink(inode);
}
return page;

error:
f2fs_put_page(page, 1);
remove_inode_page(inode); <----- Expects at most one block
allocated for inode
return ERR_PTR(err);
}

Found by Linux File System Verification project (linuxtesting.org).


Here are some additional details.

F2fs-related kernel configuration is:
CONFIG_F2FS_FS=m
CONFIG_F2FS_STAT_FS=y
CONFIG_F2FS_FS_XATTR=y
CONFIG_F2FS_FS_POSIX_ACL=y
CONFIG_F2FS_FS_SECURITY=y
CONFIG_F2FS_CHECK_FS=y


BUG_ON log:
[ 117.863869] kernel BUG at fs/f2fs/node.c:825!
[ 117.863870] invalid opcode: 0000 [#1] SMP
[ 117.863872] Modules linked in: f2fs kedr_fsim_indicator_common(OF)
kedr_fsim_indicator_capable(OF)
kedr_fsim_indicator_kmalloc(OF) kedr_fsim_vmm(OF) kedr_fsim_mem_util(OF)
kedr_fsim_capable(OF)
kedr_fsim_uaccess(OF) kedr_fsim_cmm(OF) kedr_fault_simulation(OF)
kedr(OF) fuse nf_conntrack_netbios_ns
nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT xt_conntrack
ebtable_nat ebtable_broute bridge stp llc
ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6
nf_nat_ipv6 ip6table_mangle
ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security
iptable_raw microcode i2c_piix4 parport_pc
e1000 i2c_core parport ata_generic pata_acpi [last unloaded: kedr]
[ 117.863894] CPU: 0 PID: 2766 Comm: fs-driver-tests Tainted:
GF O 3.13.0fs #2
[ 117.863895] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 117.863896] task: ffff8800001b6420 ti: ffff8800111ac000 task.ti:
ffff8800111ac000
[ 117.863897] RIP: 0010:[<ffffffffa01e03bf>] [<ffffffffa01e03bf>]
remove_inode_page+0xbf/0xd0 [f2fs]
[ 117.863901] RSP: 0018:ffff8800111ade08 EFLAGS: 00010202
[ 117.863902] RAX: 0000000000000000 RBX: ffff8800125a0c30 RCX:
ffff8800001b6a78
[ 117.863903] RDX: ffff880000000000 RSI: ffffea00004b9780 RDI:
ffff8800125a0c30
[ 117.863903] RBP: ffff8800111ade50 R08: 0000000000000001 R09:
0000000000000000
[ 117.863904] R10: 0000000000000006 R11: 000000000000000f R12:
ffffea00004b9780
[ 117.863905] R13: 0000000000000004 R14: ffffea00004b9780 R15:
ffffea00004b97c0
[ 117.863907] FS: 00007ff92dc9f740(0000) GS:ffff88003fc00000(0000)
knlGS:0000000000000000
[ 117.863908] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 117.863909] CR2: 00007f6673415000 CR3: 000000003c628000 CR4:
00000000000006f0
[ 117.863913] Stack:
[ 117.863913] 00000000000041ff ffffea00004b97c0 ffff8800111ade50
ffffffffa01e9ffa
[ 117.863915] ffffea00004b9780 ffff880000000000 ffff880012e5d000
0000000000000003
[ 117.863917] ffffea00004b9740 ffff8800111adec0 ffffffffa01d0d20
ffff880012532948
[ 117.863919] Call Trace:
[ 117.863922] [<ffffffffa01e9ffa>] ? f2fs_init_acl+0x10a/0x180 [f2fs]
[ 117.863925] [<ffffffffa01d0d20>] __f2fs_add_link+0x560/0x7c0 [f2fs]
[ 117.863928] [<ffffffffa01d3b8b>] f2fs_mkdir+0xbb/0x150 [f2fs]
[ 117.863929] [<ffffffff811cf4c7>] vfs_mkdir+0xb7/0x160
[ 117.863931] [<ffffffff811d010f>] SyS_mkdir+0x5f/0xc0
[ 117.863933] [<ffffffff8165bf29>] system_call_fastpath+0x16/0x1b
[ 117.863934] Code: e6 49 8b 14 24 83 e2 01 74 23 4c 89 e7 89 45 bc e8
f7 f9 f6 e0 4c 89 e7 e8 ff d1 f7
e0 8b 45 bc 48 83 c4 30 5b 41 5c 41 5d 5d c3 <0f> 0b e8 c8 9d 00 00 66
2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
[ 117.863953] RIP [<ffffffffa01e03bf>] remove_inode_page+0xbf/0xd0 [f2fs]
[ 117.863956] RSP <ffff8800111ade08>

There are several ways for simulate faults in kernel function calls,
e.g. manual faults insertion,
fault injection kernel infrustructure.
In my tests I use KEDR framework (http://forge.ispras.ru/projects/kedr)
for that purpose,
that is why kedr* modules are in the log above.
Call stack of the fault simulated is:

[ 117.863789] KEDR FAULT SIMULATION: forcing a failure
[ 117.863792] CPU: 0 PID: 2766 Comm: fs-driver-tests Tainted:
GF O 3.13.0fs #2
[ 117.863794] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 117.863795] ffff8800111adce8 ffff8800111adcb0 ffffffff8164bd96
0000000000000001
[ 117.863797] ffff8800111adcd8 ffffffffa018ace2 ffffffffa018ac45
ffffffffa01e8b54
[ 117.863799] 0000000000001000 ffff8800111add18 ffffffffa0194816
ffffffffa01e8b54
[ 117.863801] Call Trace:
[ 117.863806] [<ffffffff8164bd96>] dump_stack+0x45/0x56
[ 117.863810] [<ffffffffa018ace2>] kedr_fsim_point_simulate+0xa2/0xb0
[kedr_fault_simulation]
[ 117.863812] [<ffffffffa018ac45>] ? kedr_fsim_point_simulate+0x5/0xb0
[kedr_fault_simulation]
[ 117.863816] [<ffffffffa01e8b54>] ? read_all_xattrs+0x3c4/0x3e0 [f2fs]
[ 117.863819] [<ffffffffa0194816>] kedr_repl___kmalloc+0x36/0x80
[kedr_fsim_cmm]
[ 117.863822] [<ffffffffa01e8b54>] ? read_all_xattrs+0x3c4/0x3e0 [f2fs]
[ 117.863824] [<ffffffffa01955d2>]
kedr_intermediate_func___kmalloc+0x72/0xd0 [kedr_fsim_cmm]
[ 117.863826] [<ffffffffa01e8b54>] ? read_all_xattrs+0x3c4/0x3e0 [f2fs]
[ 117.863829] [<ffffffffa01e8b54>] read_all_xattrs+0x3c4/0x3e0 [f2fs]
[ 117.863832] [<ffffffffa01e91d4>] f2fs_getxattr+0x44/0xf0 [f2fs]
[ 117.863835] [<ffffffffa01e9ba9>] f2fs_get_acl+0xe9/0x390 [f2fs]
[ 117.863838] [<ffffffffa01d99c9>] ? set_dirty_dir_page+0xb9/0xe0 [f2fs]
[ 117.863841] [<ffffffffa01e9ffa>] f2fs_init_acl+0x10a/0x180 [f2fs]
[ 117.863843] [<ffffffffa01d0ccc>] __f2fs_add_link+0x50c/0x7c0 [f2fs]
[ 117.863846] [<ffffffffa01d3b8b>] f2fs_mkdir+0xbb/0x150 [f2fs]
[ 117.863849] [<ffffffff811cf4c7>] vfs_mkdir+0xb7/0x160
[ 117.863851] [<ffffffff811d010f>] SyS_mkdir+0x5f/0xc0
[ 117.863854] [<ffffffff8165bf29>] system_call_fastpath+0x16/0x1b

--
Best regards,
Andrey Tsyvarev
Linux Verification Center, ISPRAS
web: http://linuxtesting.org

---
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