general protection fault in depot_save_stack

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: f2b6e66e9885 Add linux-next specific files for 20180904
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14ba64be400000
kernel config: https://syzkaller.appspot.com/x/.config?x=15ad48400e39c1b3
dashboard link: https://syzkaller.appspot.com/bug?extid=c09e40e4b2e677cc5e25
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [Ja...@zx2c4.com da...@davemloft.net di...@arista.com
dsa...@gmail.com johann...@intel.com ktk...@virtuozzo.com
linux-...@vger.kernel.org net...@vger.kernel.org
xiyou.w...@gmail.com]

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c09e40...@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 13082 Comm: syz-executor7 Not tainted 4.19.0-rc2-next-20180904+
#55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:find_stack lib/stackdepot.c:188 [inline]
RIP: 0010:depot_save_stack+0x120/0x470 lib/stackdepot.c:238
Code: 0f 00 4e 8b 24 f5 40 40 d4 89 4d 85 e4 0f 84 d4 00 00 00 44 8d 47 ff
49 c1 e0 03 eb 0d 4d 8b 24 24 4d 85 e4 0f 84 bd 00 00 00 <41> 39 5c 24 08
75 ec 41 3b 7c 24 0c 75 e5 48 8b 01 49 39 44 24 18
RSP: 0018:ffff8801879ef280 EFLAGS: 00010206
RAX: 000000009f17cdc9 RBX: 00000000010e2ca9 RCX: ffff8801879ef2e0
RDX: 000000007e833edb RSI: 00000000006102c0 RDI: 000000000000000e
RBP: ffff8801879ef2b8 R08: 0000000000000068 R09: 00000000a8933b22
R10: 00000000cb9e8ec7 R11: 0000000000000000 R12: 7824748b48e78948
R13: ffff8801879ef2c8 R14: 00000000000e2ca9 R15: ffff8801d1551e7f
FS: 00007f3d9f248700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff400fec38 CR3: 00000001d7e29000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
save_stack+0xa9/0xd0 mm/kasan/kasan.c:454
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc_node mm/slab.c:3335 [inline]
kmem_cache_alloc_node_trace+0x139/0x720 mm/slab.c:3661
__do_kmalloc_node mm/slab.c:3681 [inline]
__kmalloc_node_track_caller+0x33/0x70 mm/slab.c:3696
__kmalloc_reserve.isra.41+0x3a/0xe0 net/core/skbuff.c:137
__alloc_skb+0x155/0x770 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:995 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1189 [inline]
netlink_sendmsg+0xb29/0xfc0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:632
___sys_sendmsg+0x51d/0x930 net/socket.c:2115
__sys_sendmmsg+0x240/0x6f0 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3d9f247c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3d9f2486d4 RCX: 0000000000457099
RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d47b8 R14: 00000000004c8d70 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace b6df230f70b415ca ]---
RIP: 0010:find_stack lib/stackdepot.c:188 [inline]
RIP: 0010:depot_save_stack+0x120/0x470 lib/stackdepot.c:238
Code: 0f 00 4e 8b 24 f5 40 40 d4 89 4d 85 e4 0f 84 d4 00 00 00 44 8d 47 ff
49 c1 e0 03 eb 0d 4d 8b 24 24 4d 85 e4 0f 84 bd 00 00 00 <41> 39 5c 24 08
75 ec 41 3b 7c 24 0c 75 e5 48 8b 01 49 39 44 24 18
RSP: 0018:ffff8801879ef280 EFLAGS: 00010206
RAX: 000000009f17cdc9 RBX: 00000000010e2ca9 RCX: ffff8801879ef2e0
RDX: 000000007e833edb RSI: 00000000006102c0 RDI: 000000000000000e
RBP: ffff8801879ef2b8 R08: 0000000000000068 R09: 00000000a8933b22
R10: 00000000cb9e8ec7 R11: 0000000000000000 R12: 7824748b48e78948
R13: ffff8801879ef2c8 R14: 00000000000e2ca9 R15: ffff8801d1551e7f
FS: 00007f3d9f248700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff400fec38 CR3: 00000001d7e29000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.