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author | Vitaly Mayatskikh <v.mayatskih@gmail.com> | 2009-03-23 22:22:33 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-03-23 22:22:33 (GMT) |
commit | 30842f2989aacfaba3ccb39829b3417be9313dbe (patch) | |
tree | e165238f359d3790a2cf21373f856226e80c7977 /net | |
parent | e072b639dc13b06b65be487633dad9bb3d2067d5 (diff) | |
download | linux-fsl-qoriq-30842f2989aacfaba3ccb39829b3417be9313dbe.tar.xz |
udp: Wrong locking code in udp seq_file infrastructure
Reading zero bytes from /proc/net/udp or other similar files which use
the same seq_file udp infrastructure panics kernel in that way:
=====================================
[ BUG: bad unlock balance detected! ]
-------------------------------------
read/1985 is trying to release lock (&table->hash[i].lock) at:
[<ffffffff81321d83>] udp_seq_stop+0x27/0x29
but there are no more locks to release!
other info that might help us debug this:
1 lock held by read/1985:
#0: (&p->lock){--..}, at: [<ffffffff810eefb6>] seq_read+0x38/0x348
stack backtrace:
Pid: 1985, comm: read Not tainted 2.6.29-rc8 #9
Call Trace:
[<ffffffff81321d83>] ? udp_seq_stop+0x27/0x29
[<ffffffff8106dab9>] print_unlock_inbalance_bug+0xd6/0xe1
[<ffffffff8106db62>] lock_release_non_nested+0x9e/0x1c6
[<ffffffff810ef030>] ? seq_read+0xb2/0x348
[<ffffffff8106bdba>] ? mark_held_locks+0x68/0x86
[<ffffffff81321d83>] ? udp_seq_stop+0x27/0x29
[<ffffffff8106dde7>] lock_release+0x15d/0x189
[<ffffffff8137163c>] _spin_unlock_bh+0x1e/0x34
[<ffffffff81321d83>] udp_seq_stop+0x27/0x29
[<ffffffff810ef239>] seq_read+0x2bb/0x348
[<ffffffff810eef7e>] ? seq_read+0x0/0x348
[<ffffffff8111aedd>] proc_reg_read+0x90/0xaf
[<ffffffff810d878f>] vfs_read+0xa6/0x103
[<ffffffff8106bfac>] ? trace_hardirqs_on_caller+0x12f/0x153
[<ffffffff810d88a2>] sys_read+0x45/0x69
[<ffffffff8101123a>] system_call_fastpath+0x16/0x1b
BUG: scheduling while atomic: read/1985/0xffffff00
INFO: lockdep is turned off.
Modules linked in: cpufreq_ondemand acpi_cpufreq freq_table dm_multipath kvm ppdev snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi_event arc4 snd_s
eq ecb thinkpad_acpi snd_seq_device iwl3945 hwmon sdhci_pci snd_pcm_oss sdhci rfkill mmc_core snd_mixer_oss i2c_i801 mac80211 yenta_socket ricoh_mmc i2c_core iTCO_wdt snd_pcm iTCO_vendor_support rs
rc_nonstatic snd_timer snd lib80211 cfg80211 soundcore snd_page_alloc video parport_pc output parport e1000e [last unloaded: scsi_wait_scan]
Pid: 1985, comm: read Not tainted 2.6.29-rc8 #9
Call Trace:
[<ffffffff8106b456>] ? __debug_show_held_locks+0x1b/0x24
[<ffffffff81043660>] __schedule_bug+0x7e/0x83
[<ffffffff8136ede9>] schedule+0xce/0x838
[<ffffffff810d7972>] ? fsnotify_access+0x5f/0x67
[<ffffffff810112d0>] ? sysret_careful+0xb/0x37
[<ffffffff8106be9c>] ? trace_hardirqs_on_caller+0x1f/0x153
[<ffffffff8137127b>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff810112f6>] sysret_careful+0x31/0x37
read[1985]: segfault at 7fffc479bfe8 ip 0000003e7420a180 sp 00007fffc479bfa0 error 6
Kernel panic - not syncing: Aiee, killing interrupt handler!
udp_seq_stop() tries to unlock not yet locked spinlock. The lock was lost
during splitting global udp_hash_lock to subsequent spinlocks.
Signed-off by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/ipv4/udp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index c47c989..c8bee18 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1614,7 +1614,8 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); if (!sk) { - spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); + if (state->bucket < UDP_HTABLE_SIZE) + spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); return udp_get_first(seq, state->bucket + 1); } return sk; @@ -1632,6 +1633,9 @@ static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) static void *udp_seq_start(struct seq_file *seq, loff_t *pos) { + struct udp_iter_state *state = seq->private; + state->bucket = UDP_HTABLE_SIZE; + return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; } |