Kernel panic with java?

[Mike Chambers]

I saw this in my log this morning from the kernel?

Sep  5 21:49:33 scrappy kernel:
=============================================
Sep  5 21:49:33 scrappy kernel: [ INFO: possible recursive locking detected ]
Sep  5 21:49:33 scrappy kernel: 2.6.17-1.2617.2.1.fc6 #1
Sep  5 21:49:33 scrappy kernel: ---------------------------------------------
Sep  5 21:49:33 scrappy kernel: java_vm/3106 is trying to acquire lock:
Sep  5 21:49:33 scrappy kernel:  (slock-AF_INET6){-+..}, at: [<c05b34de>] sk_clone+0xd4/0x2d8
Sep  5 21:49:33 scrappy kernel: 
Sep  5 21:49:33 scrappy kernel: but task is already holding lock:
Sep  5 21:49:33 scrappy kernel:  (slock-AF_INET6){-+..}, at: [<f8a204c9>] tcp_v6_rcv+0x327/0x736 [ipv6]
Sep  5 21:49:33 scrappy kernel: 
Sep  5 21:49:33 scrappy kernel: other info that might help us debug this:
Sep  5 21:49:33 scrappy kernel: 1 lock held by java_vm/3106:
Sep  5 21:49:33 scrappy kernel:  #0:  (slock-AF_INET6){-+..}, at: [<f8a204c9>] tcp_v6_rcv+0x327/0x736 [ipv6]
Sep  5 21:49:33 scrappy kernel: 
Sep  5 21:49:33 scrappy kernel: stack backtrace:
Sep  5 21:49:33 scrappy kernel:  [<c04051ee>] show_trace_log_lvl+0x58/0x171
Sep  5 21:49:33 scrappy kernel:  [<c0405802>] show_trace+0xd/0x10
Sep  5 21:49:33 scrappy kernel:  [<c040591b>] dump_stack+0x19/0x1b
Sep  5 21:49:33 scrappy kernel:  [<c043b929>] __lock_acquire+0x778/0x99c
Sep  5 21:49:33 scrappy kernel:  [<c043c0be>] lock_acquire+0x4b/0x6d
Sep  5 21:49:33 scrappy kernel:  [<c0613f53>] _spin_lock+0x19/0x28
Sep  5 21:49:33 scrappy kernel:  [<c05b34de>] sk_clone+0xd4/0x2d8
Sep  5 21:49:33 scrappy kernel:  [<c05db03f>] inet_csk_clone+0xf/0x72
Sep  5 21:49:33 scrappy kernel:  [<c05ebe7d>] tcp_create_openreq_child+0x1b/0x3a1
Sep  5 21:49:33 scrappy kernel:  [<f8a1f155>] tcp_v6_syn_recv_sock+0x271/0x5b3 [ipv6]
Sep  5 21:49:33 scrappy kernel:  [<c05ec3d8>] tcp_check_req+0x1d5/0x2e9
Sep  5 21:49:33 scrappy kernel:  [<f8a1e441>] tcp_v6_do_rcv+0x142/0x340 [ipv6]
Sep  5 21:49:33 scrappy kernel:  [<f8a20883>] tcp_v6_rcv+0x6e1/0x736 [ipv6]
Sep  5 21:49:33 scrappy kernel:  [<f8a06a6f>] ip6_input+0x1c3/0x296 [ipv6]
Sep  5 21:49:33 scrappy kernel:  [<f8a06fdf>] ipv6_rcv+0x1d2/0x21f [ipv6]
Sep  5 21:49:33 scrappy kernel:  [<c05b9548>] netif_receive_skb+0x205/0x274
Sep  5 21:49:33 scrappy kernel:  [<c05baeac>] process_backlog+0x99/0xfa
Sep  5 21:49:33 scrappy kernel:  [<c05bb08f>] net_rx_action+0x9d/0x196
Sep  5 21:49:33 scrappy kernel:  [<c04293cb>] __do_softirq+0x78/0xf2
Sep  5 21:49:33 scrappy kernel:  [<c040668b>] do_softirq+0x5a/0xbe
Sep  5 21:49:33 scrappy kernel:  [<c04291c2>] local_bh_enable_ip+0xa9/0xcf
Sep  5 21:49:33 scrappy kernel:  [<c0613ef1>] _spin_unlock_bh+0x25/0x28
Sep  5 21:49:33 scrappy kernel:  [<c05b22df>] release_sock+0xb0/0xb8
Sep  5 21:49:33 scrappy kernel:  [<c05f40f6>] inet_stream_connect+0x113/0x206
Sep  5 21:49:33 scrappy kernel:  [<c05b1242>] sys_connect+0x67/0x84
Sep  5 21:49:33 scrappy kernel:  [<c05b18b4>] sys_socketcall+0x8c/0x186
Sep  5 21:49:33 scrappy kernel:  [<c0403faf>] syscall_call+0x7/0xb
Sep  5 21:49:33 scrappy kernel: DWARF2 unwinder stuck at syscall_call+0x7/0xb

I *think* I was checking out a quick look at a web page at the time that happened, as I was also starting to head to bed.

-- 
Mike Chambers
Madisonville, KY

"Sex is like air, it's not important unless your not getting any!"