hi,
while running my usual stuff on 2.6.20-rc1-git5, sfuzz (http://www.digitaldwarf.be/products/sfuzz.c)
did the following, to produce the lockdep warning below:
socket(1, 3, 1)
accept(3, "\x54\x1f\x6d\x30\x0b\x0b\x44\xb2\x6c\x57\x8f\xcd\x12\x8b\x67\xa0", 32)
accept(3, "\x7d\xa0\x2c\x64\x45\x57\xdf\x36\xe5\x7f\xd0\x1c\x5e\x78\x6b\x0e", 16)
setsockopt(3, 48, 206, "\x6e\xec\x11\x2a\xd1\xb0\x5d\xb9\xd9\xf4\x4e\x64\xe6\x78\xce\x46", 4)
fstatfs(3, 0xbfff1cb8)
listen(3, 5)
fstatfs(3, 0xbfff1cb8)
socket(16, 3, 31)
fstat(3, 0xbfff1cb8)
getpeername(3, "\x7a\xcc\xda\xb9\x08\x52\x58\xfe\x30\x6e\xa7\x1e\x26\x6a\x3a\xbf", *-1652368178)
accept(3, "\x9b\xf9\xf8\x16\x0f\x6c\x8a\x66\x0b\xf3\x5e\xeb\xcb\xa8\xac\x09", -106)
getsockname(3, "\x68\x78\xb8\x46\x19\xe8\x61\xe1\xa7\x31\x5e\x6b\xd6\xe6\xbe\x7f", *256)
listen(3, 9)
shutdown(3, 0)
shutdown(3, 0)
fstatfs(3, 0xbfff1cb8)
getsockopt(3, 28, 127, "\x41\x0e\x19\x52\x1e\x3f\xe9\x3c\xa3\xf0\x36\x9e\xd2\x02\x84\x03", *128)
getsockopt(3, -170, 5, "\xfb\x48\x97\xdf\x7d\x4a\x79\x7a\x7e\x89\xe4\x3c\x36\x9f\x12\x30", *64)
connect(3, "\xca\xbd\x43\xff\x7e\xa6\x47\x9a\x5a\x89\x1d\x3a\xfe\xcc\x6b\x21", -140)
shutdown(3, 0)
fstatfs(3, 0xbfff1cb8)
bind(3, "\x25\x74\xed\xaf\x20\x5a\x1a\x75\xbc\x06\x37\x1d\x0a\x01\x41\x47", 32)
fstat(3, 0xbfff1cb8)
bind(3, "\xfd\xb5\x0c\x63\xd9\x32\xe6\x54\x0a\x93\xb7\xa6\x23\x68\x07\x00", 32)
bind(3, "\x00\x7c\x05\xc6\xc7\xc2\x07\x68\xbd\x1d\x23\xe3\xea\x00\xec\xe7", 128)
listen(3, 19)
setsockopt(3, 197, -140, "\x84\x7b\xa2\xf8\x29\xf9\x2a\xd1\xd4\xe1\xa1\xcf\x5e\x7f\x6b\x4c", 32)
Here is the stacktrace:
[ 313.239556] =======================================================
[ 313.239718] [ INFO: possible circular locking dependency detected ]
[ 313.239795] 2.6.20-rc1-git5 #26
[ 313.239858] -------------------------------------------------------
[ 313.239929] sfuzz/4133 is trying to acquire lock:
[ 313.239996] (ref_table_lock){-+..}, at: [<c04cd0a9>] tipc_ref_discard+0x29/0xe0
[ 313.241101]
[ 313.241105] but task is already holding lock:
[ 313.241225] (&table[i].lock){-+..}, at: [<c04cb7c0>] tipc_deleteport+0x40/0x1a0
[ 313.241524]
[ 313.241528] which lock already depends on the new lock.
[ 313.241535]
[ 313.241709]
[ 313.241713] the existing dependency chain (in reverse order) is:
[ 313.241837]
[ 313.241841] -> #1 (&table[i].lock){-+..}:
[ 313.242096] [<c01366c5>] __lock_acquire+0xd05/0xde0
[ 313.242562] [<c0136809>] lock_acquire+0x69/0xa0
[ 313.243013] [<c04d4040>] _spin_lock_bh+0x40/0x60
[ 313.243476] [<c04cd1cb>] tipc_ref_acquire+0x6b/0xe0
[ 313.244115] [<c04cac73>] tipc_createport_raw+0x33/0x260
[ 313.244562] [<c04cbe21>] tipc_createport+0x41/0x120
[ 313.245007] [<c04c57ec>] tipc_subscr_start+0xcc/0x120
[ 313.245458] [<c04bdb56>] process_signal_queue+0x56/0xa0
[ 313.245906] [<c011ea18>] tasklet_action+0x38/0x80
[ 313.246361] [<c011ecbb>] __do_softirq+0x5b/0xc0
[ 313.246817] [<c01060e8>] do_softirq+0x88/0xe0
[ 313.247450] [<ffffffff>] 0xffffffff
[ 313.247894]
[ 313.247898] -> #0 (ref_table_lock){-+..}:
[ 313.248155] [<c0136415>] __lock_acquire+0xa55/0xde0
[ 313.248601] [<c0136809>] lock_acquire+0x69/0xa0
[ 313.249037] [<c04d4100>] _write_lock_bh+0x40/0x60
[ 313.249486] [<c04cd0a9>] tipc_ref_discard+0x29/0xe0
[ 313.249922] [<c04cb7da>] tipc_deleteport+0x5a/0x1a0
[ 313.250543] [<c04cd4f8>] tipc_create+0x58/0x160
[ 313.250980] [<c0431cb2>] __sock_create+0x112/0x280
[ 313.251422] [<c0431e5a>] sock_create+0x1a/0x20
[ 313.251863] [<c04320fb>] sys_socket+0x1b/0x40
[ 313.252301] [<c0432a72>] sys_socketcall+0x92/0x260
[ 313.252738] [<c0102fd0>] syscall_call+0x7/0xb
[ 313.253175] [<ffffffff>] 0xffffffff
[ 313.253778]
[ 313.253782] other info that might help us debug this:
[ 313.253790]
[ 313.253956] 1 lock held by sfuzz/4133:
[ 313.254019] #0: (&table[i].lock){-+..}, at: [<c04cb7c0>] tipc_deleteport+0x40/0x1a0
[ 313.254346]
[ 313.254351] stack backtrace:
[ 313.254470] [<c01045da>] show_trace_log_lvl+0x1a/0x40
[ 313.254594] [<c0104d72>] show_trace+0x12/0x20
[ 313.254711] [<c0104e79>] dump_stack+0x19/0x20
[ 313.254829] [<c013480f>] print_circular_bug_tail+0x6f/0x80
[ 313.254952] [<c0136415>] __lock_acquire+0xa55/0xde0
[ 313.255070] [<c0136809>] lock_acquire+0x69/0xa0
[ 313.255188] [<c04d4100>] _write_lock_bh+0x40/0x60
[ 313.255315] [<c04cd0a9>] tipc_ref_discard+0x29/0xe0
[ 313.255435] [<c04cb7da>] tipc_deleteport+0x5a/0x1a0
[ 313.255565] [<c04cd4f8>] tipc_create+0x58/0x160
[ 313.255687] [<c0431cb2>] __sock_create+0x112/0x280
[ 313.255811] [<c0431e5a>] sock_create+0x1a/0x20
[ 313.255942] [<c04320fb>] sys_socket+0x1b/0x40
[ 313.256059] [<c0432a72>] sys_socketcall+0x92/0x260
[ 313.256179] [<c0102fd0>] syscall_call+0x7/0xb
[ 313.256300] =======================
Greetings, Eric
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