I caught a deadlock bug in 3.14 kernel occasionally on my panda board. It looks like a real issue. Any one like take a look on this?
* Starting configure virtual network devices[74G[ OK ] * Stopping configure virtual network devices[74G[ OK ] * Stopping OpenSSH server[74G[ OK ] * Starting OpenSSH server[74G[ OK ] [ 18.449584] [ 18.449584] ================================= [ 18.455810] [ INFO: inconsistent lock state ] [ 18.459289] 3.14.0 #81 Not tainted [ 18.459289] --------------------------------- [ 18.459289] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. [ 18.469238] kworker/0:1/560 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 18.480834] (&addrconf_stats->syncp.seq){+.?...}, at: [<c0523fdb>] ipv6_mc_dad_complete+0x23/0x40 [ 18.489624] {IN-SOFTIRQ-W} state was registered at: [ 18.495605] [<c0070091>] __lock_acquire+0x47d/0x17e8 [ 18.499938] [<c0071a6b>] lock_acquire+0x6b/0x164 [ 18.503143] [<c051fd69>] mld_sendpack+0xd1/0x5f4 [ 18.509307] [<c0520827>] mld_ifc_timer_expire+0x16b/0x1fc [ 18.509307] [<c003d8c5>] call_timer_fn+0x6d/0x244 [ 18.522460] [<c003dff1>] run_timer_softirq+0x12d/0x26c [ 18.522460] [<c0038003>] __do_softirq+0x11b/0x3b8 [ 18.532531] [<c00384e9>] irq_exit+0x85/0xb8 [ 18.533874] [<c000e045>] handle_IRQ+0x39/0x70 [ 18.539306] [<c0008591>] gic_handle_irq+0x2d/0x54 [ 18.539306] [<c0570dbf>] __irq_svc+0x3f/0x64 [ 18.550445] [<c05726e8>] do_page_fault.part.11+0x104/0x2b4 [ 18.558654] [<c05728f3>] do_page_fault+0x5b/0x60 [ 18.559783] [<c00083c9>] do_DataAbort+0x35/0x78 [ 18.568725] [<c0570f83>] __dabt_usr+0x43/0x60 [ 18.573516] irq event stamp: 7141 [ 18.577026] hardirqs last enabled at (7141): [<c00383bf>] __local_bh_enable_ip+0x63/0xa8 [ 18.585693] hardirqs last disabled at (7139): [<c0038389>] __local_bh_enable_ip+0x2d/0xa8 [ 18.594360] softirqs last enabled at (7140): [<c0501448>] ip6_finish_output2+0x1e4/0x88c [ 18.603027] softirqs last disabled at (7130): [<c05012a2>] ip6_finish_output2+0x3e/0x88c [ 18.611602] [ 18.611602] other info that might help us debug this: [ 18.618499] Possible unsafe locking scenario: [ 18.618499] [ 18.624755] CPU0 [ 18.627349] ---- [ 18.629943] lock(&addrconf_stats->syncp.seq); [ 18.634735] <Interrupt> [ 18.637512] lock(&addrconf_stats->syncp.seq); [ 18.642486] [ 18.642486] *** DEADLOCK *** [ 18.642486] [ 18.648742] 4 locks held by kworker/0:1/560: [ 18.653259] #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [<c0049b32>] process_one_work+0xd2/0x4b4 [ 18.662536] #1: ((&(&ifa->dad_work)->work)){+.+...}, at: [<c0049b32>] process_one_work+0xd2/0x4b4 [ 18.672149] #2: (rtnl_mutex){+.+.+.}, at: [<c050bf4d>] addrconf_dad_work+0x1d/0x250 [ 18.680450] #3: (rcu_read_lock){.+.+..}, at: [<c051fc98>] mld_sendpack+0x0/0x5f4 [ 18.688507] [ 18.688507] stack backtrace: [ 18.693145] CPU: 0 PID: 560 Comm: kworker/0:1 Not tainted 3.14.0 #81 [ 18.699859] Workqueue: ipv6_addrconf addrconf_dad_work [ 18.705322] [<c00133ad>] (unwind_backtrace) from [<c0010761>] (show_stack+0x11/0x14) [ 18.713531] [<c0010761>] (show_stack) from [<c056b2e9>] (dump_stack+0x71/0x84) [ 18.721191] [<c056b2e9>] (dump_stack) from [<c0567a29>] (print_usage_bug+0x25d/0x268) [ 18.729492] [<c0567a29>] (print_usage_bug) from [<c006f2f7>] (mark_lock+0x173/0x5dc) [ 18.737670] [<c006f2f7>] (mark_lock) from [<c00700d7>] (__lock_acquire+0x4c3/0x17e8) [ 18.745880] [<c00700d7>] (__lock_acquire) from [<c0071a6b>] (lock_acquire+0x6b/0x164) [ 18.754180] [<c0071a6b>] (lock_acquire) from [<c051ffd7>] (mld_sendpack+0x33f/0x5f4) [ 18.762390] [<c051ffd7>] (mld_sendpack) from [<c0523fdb>] (ipv6_mc_dad_complete+0x23/0x40) [ 18.771118] [<c0523fdb>] (ipv6_mc_dad_complete) from [<c050bea3>] (addrconf_dad_completed+0xb3/0x140) [ 18.780883] [<c050bea3>] (addrconf_dad_completed) from [<c050c0ab>] (addrconf_dad_work+0x17b/0x250) [ 18.790496] [<c050c0ab>] (addrconf_dad_work) from [<c0049b97>] (process_one_work+0x137/0x4b4) [ 18.799499] [<c0049b97>] (process_one_work) from [<c004a793>] (worker_thread+0xef/0x2d8) [ 18.808074] [<c004a793>] (worker_thread) from [<c004f90f>] (kthread+0xa7/0xb8) [ 18.815734] [<c004f90f>] (kthread) from [<c000d809>] (ret_from_fork+0x11/0x1c) * Starting NetBIOS n -- Thanks Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/