Hi Alex, the module unloading caused some issues in the receiving end. I tried this: * setup bluetooth 6lowpan connection * transfer some UDP data * unload the nhc_rfc6282_udp module (in one peer only, the other still had udp nhc module loaded) * try to send more data This caused kernel crash in peer that had udp module unloaded: [ 154.430480] (NULL net_device): received unknown nhc id which was not found. [ 154.846307] kmemleak: Cannot insert 0xcc4e2c00 into the object search tree (overlaps existing) [ 154.847036] CPU: 0 PID: 291 Comm: systemd-journal Not tainted 3.17.0-bt6lowpan #2 [ 154.847036] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 154.847036] cc4e2c00 00000000 ce06fd34 c1898b02 cd096320 ce06fd68 c11716ac c1afdb94 [ 154.847036] cc4e2c00 00000286 cd09634c 0000000e 00000010 cd09638c 00000000 000000d0 [ 154.847036] cf001c00 cf001c00 ce06fd9c c1895ac8 000000d0 ce06fd80 c10729cb 00000001 [ 154.847036] Call Trace: [ 154.847036] [<c1898b02>] dump_stack+0x4b/0x75 [ 154.847036] [<c11716ac>] create_object+0x22c/0x280 [ 154.847036] [<c1895ac8>] kmemleak_alloc+0x38/0xb0 [ 154.847036] [<c10729cb>] ? get_parent_ip+0xb/0x40 [ 154.847036] [<c1072a4b>] ? preempt_count_add+0x4b/0xa0 [ 154.847036] [<c1165123>] kmem_cache_alloc_trace+0x1c3/0x2a0 [ 154.847036] [<c1196674>] ? seq_open+0xa4/0xc0 [ 154.847036] [<c1196674>] seq_open+0xa4/0xc0 [ 154.847036] [<c11c7750>] ? proc_setattr+0x50/0x50 [ 154.847036] [<c1196f1f>] single_open+0x4f/0x90 [ 154.847036] [<c11c8749>] proc_single_open+0x19/0x20 [ 154.847036] [<c1172ecc>] do_dentry_open+0x19c/0x2d0 [ 154.847036] [<c11c8730>] ? sched_open+0x20/0x20 [ 154.847036] [<c117354b>] finish_open+0x2b/0x50 [ 154.847036] [<c118249a>] do_last.isra.40+0x5fa/0xcc0 [ 154.847036] [<c117fa1e>] ? link_path_walk+0x5e/0x790 [ 154.847036] [<c1182c06>] path_openat+0xa6/0x5c0 [ 154.847036] [<c13e0112>] ? debug_smp_processor_id+0x12/0x20 [ 154.847036] [<c11842b1>] do_filp_open+0x31/0x90 [ 154.847036] [<c1174727>] do_sys_open+0x117/0x210 [ 154.847036] [<c18a192f>] ? restore_all+0xf/0xf [ 154.847036] [<c13e012f>] ? __this_cpu_preempt_check+0xf/0x20 [ 154.847036] [<c1080000>] ? pick_next_task_fair+0x340/0x550 [ 154.847036] [<c1174842>] SyS_open+0x22/0x30 [ 154.847036] [<c18a18f6>] syscall_call+0x7/0x7 [ 154.847036] [<c18a0000>] ? __account_scheduler_latency+0x60/0x2a0 [ 154.847036] kmemleak: Kernel memory leak detector disabled [ 154.847036] kmemleak: Object 0xcc4e2c00 (size 192): [ 154.847036] kmemleak: comm "systemd-journal", pid 291, jiffies 4294822142 [ 154.847036] kmemleak: min_count = 1 [ 154.847036] kmemleak: count = 0 [ 154.847036] kmemleak: flags = 0x1 [ 154.847036] kmemleak: checksum = 0 [ 154.847036] kmemleak: backtrace: [ 154.847036] [<c1895ac8>] kmemleak_alloc+0x38/0xb0 [ 154.847036] [<c1164e83>] kmem_cache_alloc+0x1c3/0x2a0 [ 154.847036] [<c177a5d1>] __alloc_skb+0x41/0x1b0 [ 154.847036] [<c177a84b>] alloc_skb_with_frags+0x4b/0x1c0 [ 154.847036] [<c177394a>] sock_alloc_send_pskb+0x1aa/0x210 [ 154.847036] [<c1826d28>] unix_dgram_sendmsg+0x138/0x560 [ 154.847036] [<c17702b9>] sock_sendmsg+0x59/0x80 [ 154.847036] [<c177179f>] ___sys_sendmsg.part.30+0x2df/0x2f0 [ 154.847036] [<c1772724>] __sys_sendmsg+0x44/0x80 [ 154.847036] [<c1772d80>] SyS_socketcall+0xd0/0x2b0 [ 154.847036] [<c18a18f6>] syscall_after_call+0x0/0x4 [ 154.847036] [<ffffffff>] 0xffffffff [ 172.825327] Clocksource tsc unstable (delta = 14060914275 ns) [ 173.175027] INFO: trying to register non-static key. [ 173.175694] the code is fine but needs lockdep annotation. [ 173.175694] turning off the locking correctness validator. [ 173.175694] CPU: 0 PID: 378 Comm: syslogd Not tainted 3.17.0-bt6lowpan #2 [ 173.175694] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 173.175694] 00000000 00000000 cd669cf4 c1898b02 c22f0890 cd669d70 c109412a c1ae4b78 [ 173.175694] cf794500 c1ead500 00000000 cd669d44 c107770f 00000000 007b23e7 00000000 [ 173.175694] c1ead500 00004a25 00004a25 c1d67cc0 00000000 cc4e58e8 c13e0112 cd669d4c [ 173.175694] Call Trace: [ 173.175694] [<c1898b02>] dump_stack+0x4b/0x75 [ 173.175694] [<c109412a>] __lock_acquire+0x189a/0x1d20 [ 173.175694] [<c107770f>] ? sched_clock_cpu+0x10f/0x160 [ 173.175694] [<c13e0112>] ? debug_smp_processor_id+0x12/0x20 [ 173.175694] [<c108e584>] ? get_lock_stats+0x24/0x40 [ 173.175694] [<c189fa95>] ? schedule_timeout+0x145/0x200 [ 173.175694] [<c1090a34>] ? mark_held_locks+0x64/0x90 [ 173.175694] [<c1094c56>] lock_acquire+0xb6/0x170 [ 173.175694] [<c177e385>] ? __skb_recv_datagram+0x65/0x480 [ 173.175694] [<c18a0899>] _raw_spin_lock_irqsave+0x59/0x90 [ 173.175694] [<c177e385>] ? __skb_recv_datagram+0x65/0x480 [ 173.175694] [<c177e385>] __skb_recv_datagram+0x65/0x480 [ 173.175694] [<c1090cab>] ? trace_hardirqs_on+0xb/0x10 [ 173.175694] [<c177e7e0>] ? skb_recv_datagram+0x40/0x40 [ 173.175694] [<c182747f>] unix_dgram_recvmsg+0x7f/0x3e0 [ 173.175694] [<c1770f06>] sock_aio_read+0xc6/0x100 [ 173.175694] [<c10bde45>] ? clockevents_program_event+0xa5/0x150 [ 173.175694] [<c1174ce7>] do_sync_read+0x57/0x90 [ 173.175694] [<c1175878>] vfs_read+0x108/0x140 [ 173.175694] [<c1175e22>] SyS_read+0x52/0xb0 [ 173.175694] [<c18a18f6>] syscall_call+0x7/0x7 [ 173.175694] BUG: unable to handle kernel NULL pointer dereference at 0000006a [ 173.175694] IP: [<c177e397>] __skb_recv_datagram+0x77/0x480 [ 173.175694] *pde = 00000000 [ 173.175694] Oops: 0000 [#1] PREEMPT SMP [ 173.175694] Modules linked in: nhc_rfc6282_route nhc_rfc6282_dest bluetooth_6lowpan nhc_rfc6282_mobil nhc_rfc6282_frag nhc_rfc6282_hop nhc_rfc6282_ipv6 6lowpan ecb btusb bluetooth nfc rfkill snd_intel8x0 snd_ac97_codec ohci_pci ac97_bus parport_pc parport uvesafb [last unloaded: nhc_rfc6282_udp] Cheers, Jukka -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
