net/dccp: warning in dccp_feat_clone_sp_val/__might_sleep

[Andrey Konovalov]

Hi,

I've got the following error report while running the syzkaller fuzzer:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 4608 at kernel/sched/core.c:7724
__might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719
do not call blocking ops when !TASK_RUNNING; state=1 set at
[<ffffffff811f5a5c>] prepare_to_wait+0xbc/0x210
kernel/sched/wait.c:178
Modules linked in:
CPU: 0 PID: 4608 Comm: syz-executor Not tainted 4.9.0-rc2+ #320
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff88006625f7a0 ffffffff81b46914 ffff88006625f818 0000000000000000
 ffffffff84052960 0000000000000000 ffff88006625f7e8 ffffffff81111237
 ffff88006aceac00 ffffffff00001e2c ffffed000cc4beff ffffffff84052960
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46914>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff81111237>] __warn+0x1a7/0x1f0 kernel/panic.c:550
 [<ffffffff8111132c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:565
 [<ffffffff811922fc>] __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719
 [<     inline     >] slab_pre_alloc_hook mm/slab.h:393
 [<     inline     >] slab_alloc_node mm/slub.c:2634
 [<     inline     >] slab_alloc mm/slub.c:2716
 [<ffffffff81508da0>] __kmalloc_track_caller+0x150/0x2a0 mm/slub.c:4240
 [<ffffffff8146be14>] kmemdup+0x24/0x50 mm/util.c:113
 [<ffffffff8388b2cf>] dccp_feat_clone_sp_val.part.5+0x4f/0xe0
net/dccp/feat.c:374
 [<     inline     >] dccp_feat_clone_sp_val net/dccp/feat.c:1141
 [<     inline     >] dccp_feat_change_recv net/dccp/feat.c:1141
 [<ffffffff8388d491>] dccp_feat_parse_options+0xaa1/0x13d0 net/dccp/feat.c:1411
 [<ffffffff83894f01>] dccp_parse_options+0x721/0x1010 net/dccp/options.c:128
 [<ffffffff83891280>] dccp_rcv_state_process+0x200/0x15b0 net/dccp/input.c:644
 [<ffffffff838b8a94>] dccp_v4_do_rcv+0xf4/0x1a0 net/dccp/ipv4.c:681
 [<     inline     >] sk_backlog_rcv ./include/net/sock.h:872
 [<ffffffff82b7ceb6>] __release_sock+0x126/0x3a0 net/core/sock.c:2044
 [<ffffffff82b7d189>] release_sock+0x59/0x1c0 net/core/sock.c:2502
 [<     inline     >] inet_wait_for_connect net/ipv4/af_inet.c:547
 [<ffffffff8316b2a2>] __inet_stream_connect+0x5d2/0xbb0 net/ipv4/af_inet.c:617
 [<ffffffff8316b8d5>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:656
 [<ffffffff82b705e4>] SYSC_connect+0x244/0x2f0 net/socket.c:1533
 [<ffffffff82b72dd4>] SyS_connect+0x24/0x30 net/socket.c:1514
 [<ffffffff83fbf701>] entry_SYSCALL_64_fastpath+0x1f/0xc2
arch/x86/entry/entry_64.S:209
---[ end trace 0dc4109d69f4e51e ]---

On commit 14970f204b1993af7459d5bd34aaff38dfee6670 (Oct 27).

A reproducer is attached.

Attachment: dccp-feat-warn-poc.c
Description: Binary data