Message-ID: <13a58eb5-d756-46a3-81f0-aba96184b266@oracle.com>
Date: Thu, 5 Sep 2024 00:35:35 -0700
From: Shoaib Rao <rao.shoaib@...cle.com>
To: Eric Dumazet <edumazet@...gle.com>,
        syzbot <syzbot+8811381d455e3e9ec788@...kaller.appspotmail.com>
Cc: davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in
 unix_stream_read_actor (2)


On 9/4/2024 10:32 AM, Shoaib Rao wrote:
>
> On 9/4/2024 8:32 AM, Eric Dumazet wrote:
>> On Wed, Sep 4, 2024 at 5:13 PM syzbot
>> <syzbot+8811381d455e3e9ec788@...kaller.appspotmail.com> wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit:    fbdaffe41adc Merge branch 'am-qt2025-phy-rust'
>>> git tree:       net-next
>>> console+strace: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/x/log.txt?x=13d7c44d980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCinyPp6_w$
>>> kernel config: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/x/.config?x=996585887acdadb3__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChXq35SIA$
>>> dashboard link: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/bug?extid=8811381d455e3e9ec788__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCgeHsuB4Q$
>>> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils 
>>> for Debian) 2.40
>>> syz repro: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/x/repro.syz?x=14b395db980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChfSXV14A$
>>> C reproducer: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/x/repro.c?x=16d3fc53980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChGWZhDug$
>>>
>>> Downloadable assets:
>>> disk image: 
>>> https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/feaa1b13b490/disk-fbdaffe4.raw.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChjbj6XGw$
>>> vmlinux: 
>>> https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/8e5dccd0377a/vmlinux-fbdaffe4.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChlarTUfA$
>>> kernel image: 
>>> https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/75151f74f4c9/bzImage-fbdaffe4.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCgl9hRVww$
>>>
>>> Bisection is inconclusive: the first bad commit could be any of:
>>>
>>> 06ab21c3cb6e dt-bindings: net: mediatek,net: add top-level constraints
>>> 70d16e13368c dt-bindings: net: renesas,etheravb: add top-level 
>>> constraints
>>>
>>> bisection log: 
>>> https://urldefense.com/v3/__https://syzkaller.appspot.com/x/bisect.txt?x=11d42e63980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCjDvB9Flg$
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the 
>>> commit:
>>> Reported-by: syzbot+8811381d455e3e9ec788@...kaller.appspotmail.com
>>>
>>> ==================================================================
>>> BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 
>>> net/unix/af_unix.c:2959
>>> Read of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235
>>>
>>> CPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 
>>> 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, 
>>> BIOS Google 08/06/2024
>>> Call Trace:
>>>   <TASK>
>>>   __dump_stack lib/dump_stack.c:93 [inline]
>>>   dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
>>>   print_address_description mm/kasan/report.c:377 [inline]
>>>   print_report+0x169/0x550 mm/kasan/report.c:488
>>>   kasan_report+0x143/0x180 mm/kasan/report.c:601
>>>   unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959
>>>   unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640
>>>   unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778
>>>   unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996
>>>   sock_recvmsg_nosec net/socket.c:1046 [inline]
>>>   sock_recvmsg+0x22f/0x280 net/socket.c:1068
>>>   ____sys_recvmsg+0x1db/0x470 net/socket.c:2816
>>>   ___sys_recvmsg net/socket.c:2858 [inline]
>>>   __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888
>>>   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>>>   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>>>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>> RIP: 0033:0x7f5360d6b4e9
>>> Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 
>>> 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 
>>> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
>>> RSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
>>> RAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9
>>> RDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003
>>> RBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000
>>> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
>>> R13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001
>>>   </TASK>
>>>
>>> Allocated by task 5235:
>>>   kasan_save_stack mm/kasan/common.c:47 [inline]
>>>   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>>>   unpoison_slab_object mm/kasan/common.c:312 [inline]
>>>   __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
>>>   kasan_slab_alloc include/linux/kasan.h:201 [inline]
>>>   slab_post_alloc_hook mm/slub.c:3988 [inline]
>>>   slab_alloc_node mm/slub.c:4037 [inline]
>>>   kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080
>>>   __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667
>>>   alloc_skb include/linux/skbuff.h:1320 [inline]
>>>   alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528
>>>   sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815
>>>   sock_alloc_send_skb include/net/sock.h:1778 [inline]
>>>   queue_oob+0x108/0x680 net/unix/af_unix.c:2198
>>>   unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351
>>>   sock_sendmsg_nosec net/socket.c:730 [inline]
>>>   __sock_sendmsg+0x221/0x270 net/socket.c:745
>>>   ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
>>>   ___sys_sendmsg net/socket.c:2651 [inline]
>>>   __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680
>>>   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>>>   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>>>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>>
>>> Freed by task 5235:
>>>   kasan_save_stack mm/kasan/common.c:47 [inline]
>>>   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>>>   kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
>>>   poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
>>>   __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
>>>   kasan_slab_free include/linux/kasan.h:184 [inline]
>>>   slab_free_hook mm/slub.c:2252 [inline]
>>>   slab_free mm/slub.c:4473 [inline]
>>>   kmem_cache_free+0x145/0x350 mm/slub.c:4548
>>>   unix_stream_read_generic+0x1ef6/0x2520 net/unix/af_unix.c:2917
>>>   unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996
>>>   sock_recvmsg_nosec net/socket.c:1046 [inline]
>>>   sock_recvmsg+0x22f/0x280 net/socket.c:1068
>>>   __sys_recvfrom+0x256/0x3e0 net/socket.c:2255
>>>   __do_sys_recvfrom net/socket.c:2273 [inline]
>>>   __se_sys_recvfrom net/socket.c:2269 [inline]
>>>   __x64_sys_recvfrom+0xde/0x100 net/socket.c:2269
>>>   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>>>   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>>>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>>
>>> The buggy address belongs to the object at ffff8880326abc80
>>>   which belongs to the cache skbuff_head_cache of size 240
>>> The buggy address is located 68 bytes inside of
>>>   freed 240-byte region [ffff8880326abc80, ffff8880326abd70)
>>>
>>> The buggy address belongs to the physical page:
>>> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 
>>> pfn:0x326ab
>>> ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
>>> page_type: 0xfdffffff(slab)
>>> raw: 00fff00000000000 ffff88801eaee780 ffffea0000b7dc80 
>>> dead000000000003
>>> raw: 0000000000000000 00000000800c000c 00000001fdffffff 
>>> 0000000000000000
>>> page dumped because: kasan: bad access detected
>>> page_owner tracks the page as allocated
>>> page last allocated via order 0, migratetype Unmovable, gfp_mask 
>>> 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4686, 
>>> tgid 4686 (udevadm), ts 32357469485, free_ts 28829011109
>>>   set_page_owner include/linux/page_owner.h:32 [inline]
>>>   post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
>>>   prep_new_page mm/page_alloc.c:1501 [inline]
>>>   get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
>>>   __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
>>>   __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
>>>   alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
>>>   alloc_slab_page+0x5f/0x120 mm/slub.c:2321
>>>   allocate_slab+0x5a/0x2f0 mm/slub.c:2484
>>>   new_slab mm/slub.c:2537 [inline]
>>>   ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
>>>   __slab_alloc+0x58/0xa0 mm/slub.c:3813
>>>   __slab_alloc_node mm/slub.c:3866 [inline]
>>>   slab_alloc_node mm/slub.c:4025 [inline]
>>>   kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4080
>>>   __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667
>>>   alloc_skb include/linux/skbuff.h:1320 [inline]
>>>   alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289
>>>   uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
>>>   kobject_uevent_net_broadcast+0x2fd/0x580 lib/kobject_uevent.c:410
>>>   kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
>>>   kobject_synth_uevent+0x4ef/0xae0 lib/kobject_uevent.c:207
>>>   uevent_store+0x4b/0x70 drivers/base/bus.c:633
>>>   kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334
>>>   new_sync_write fs/read_write.c:497 [inline]
>>>   vfs_write+0xa72/0xc90 fs/read_write.c:590
>>> page last free pid 1 tgid 1 stack trace:
>>>   reset_page_owner include/linux/page_owner.h:25 [inline]
>>>   free_pages_prepare mm/page_alloc.c:1094 [inline]
>>>   free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612
>>>   kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:408
>>>   apply_to_pte_range mm/memory.c:2797 [inline]
>>>   apply_to_pmd_range mm/memory.c:2841 [inline]
>>>   apply_to_pud_range mm/memory.c:2877 [inline]
>>>   apply_to_p4d_range mm/memory.c:2913 [inline]
>>>   __apply_to_page_range+0x8a8/0xe50 mm/memory.c:2947
>>>   kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:525
>>>   purge_vmap_node+0x3e3/0x770 mm/vmalloc.c:2208
>>>   __purge_vmap_area_lazy+0x708/0xae0 mm/vmalloc.c:2290
>>>   _vm_unmap_aliases+0x79d/0x840 mm/vmalloc.c:2885
>>>   change_page_attr_set_clr+0x2fe/0xdb0 
>>> arch/x86/mm/pat/set_memory.c:1881
>>>   change_page_attr_set arch/x86/mm/pat/set_memory.c:1922 [inline]
>>>   set_memory_nx+0xf2/0x130 arch/x86/mm/pat/set_memory.c:2110
>>>   free_init_pages arch/x86/mm/init.c:924 [inline]
>>>   free_kernel_image_pages arch/x86/mm/init.c:943 [inline]
>>>   free_initmem+0x79/0x110 arch/x86/mm/init.c:970
>>>   kernel_init+0x31/0x2b0 init/main.c:1476
>>>   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>>>   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>>>
>>> Memory state around the buggy address:
>>>   ffff8880326abb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>>   ffff8880326abc00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>>>> ffff8880326abc80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>>                                             ^
>>>   ffff8880326abd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
>>>   ffff8880326abd80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>>> ==================================================================
>>>
>>>
>>> ---
>>> This report is generated by a bot. It may contain errors.
>>> See 
>>> https://urldefense.com/v3/__https://goo.gl/tpsmEJ__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCj0yiM5oA$ 
>>> for more information about syzbot.
>>> syzbot engineers can be reached at syzkaller@...glegroups.com.
>>>
>>> syzbot will keep track of this issue. See:
>>> https://urldefense.com/v3/__https://goo.gl/tpsmEJ*status__;Iw!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCglGrElYg$ 
>>> for how to communicate with syzbot.
>>> For information about bisection process see: 
>>> https://urldefense.com/v3/__https://goo.gl/tpsmEJ*bisection__;Iw!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChS6eLfFw$
>>>
>>> If the report is already addressed, let syzbot know by replying with:
>>> #syz fix: exact-commit-title
>>>
>>> If you want syzbot to run the reproducer, reply with:
>>> #syz test: git://repo/address.git branch-or-commit-hash
>>> If you attach or paste a git patch, syzbot will apply it before 
>>> testing.
>>>
>>> If you want to overwrite report's subsystems, reply with:
>>> #syz set subsystems: new-subsystem
>>> (See the list of subsystem names on the web dashboard)
>>>
>>> If the report is a duplicate of another one, reply with:
>>> #syz dup: exact-subject-of-another-report
>>>
>>> If you want to undo deduplication, reply with:
>>> #syz undup
>>
>> Another af_unix OOB issue.
>>
>> Rao can you take a look ?
>>
>> Thanks.
>
> Sure I will take a look.
>
> Shoaib
>
Hi All,

I am not able to reproduce the issue. I have run the C program at least 
100 times in a loop. In the I do get an EFAULT, not sure if that is 
intentional or not but no panic. Should I be doing something 
differently? The kernel version I am using is 
v6.11-rc6-70-gc763c4339688. Later I can try with the exact version.

[rshoaib@...bo-2 debug_pnic]$ gcc cause_panic.c -o panic_sys
[rshoaib@...bo-2 debug_pnic]$ strace -f ./panic_sys
execve("./panic_sys", ["./panic_sys"], 0x7ffe7d271d38 /* 63 vars */) = 0
brk(NULL)                               = 0x18104000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffe134f7880) = -1 EINVAL (Invalid 
argument)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or 
directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=94859, ...}) = 0
mmap(NULL, 94859, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7feb7dd0f000
close(3)                                = 0
openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, 
"\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\251\3\0\0\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2164792, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7feb7dd0d000
lseek(3, 808, SEEK_SET)                 = 808
read(3, 
"\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32) = 32
mmap(NULL, 4020448, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x7feb7d728000
mprotect(0x7feb7d8f5000, 2093056, PROT_NONE) = 0
mmap(0x7feb7daf4000, 24576, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1cc000) = 0x7feb7daf4000
mmap(0x7feb7dafa000, 14560, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7feb7dafa000
close(3)                                = 0
arch_prctl(ARCH_SET_FS, 0x7feb7dd0e500) = 0
mprotect(0x7feb7daf4000, 16384, PROT_READ) = 0
mprotect(0x600000, 4096, PROT_READ)     = 0
mprotect(0x7feb7dd2d000, 4096, PROT_READ) = 0
munmap(0x7feb7dd0f000, 94859)           = 0
mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 
-1, 0) = 0x1ffff000
mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000
mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 
-1, 0) = 0x21000000
write(1, "executing program\n", 18executing program
)     = 18
socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0
sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\333", 
iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 
MSG_OOB|MSG_DONTWAIT) = 1
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=NULL, msg_iovlen=0, 
msg_controllen=0, msg_flags=MSG_OOB}, MSG_OOB|MSG_WAITFORONE) = 1
sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\21", 
iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 
MSG_OOB|MSG_NOSIGNAL|MSG_MORE) = 1
recvfrom(3, "\21", 125, MSG_DONTROUTE|MSG_TRUNC, NULL, NULL) = 1
recvmsg(3, {msg_namelen=0}, MSG_OOB|MSG_ERRQUEUE) = -1 EFAULT (Bad 
address)     <======
exit_group(0)                           = ?
+++ exited with 0 +++

Regards,

Shoaib

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