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fbd019737d
linux/net/sctp
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Xin Long fbd019737d sctp: avoid running the sctp state machine recursively 
Ying triggered a call trace when doing an asconf testing:

  BUG: scheduling while atomic: swapper/12/0/0x10000100
  Call Trace:
   <IRQ>  [<ffffffffa4375904>] dump_stack+0x19/0x1b
   [<ffffffffa436fcaf>] __schedule_bug+0x64/0x72
   [<ffffffffa437b93a>] __schedule+0x9ba/0xa00
   [<ffffffffa3cd5326>] __cond_resched+0x26/0x30
   [<ffffffffa437bc4a>] _cond_resched+0x3a/0x50
   [<ffffffffa3e22be8>] kmem_cache_alloc_node+0x38/0x200
   [<ffffffffa423512d>] __alloc_skb+0x5d/0x2d0
   [<ffffffffc0995320>] sctp_packet_transmit+0x610/0xa20 [sctp]
   [<ffffffffc098510e>] sctp_outq_flush+0x2ce/0xc00 [sctp]
   [<ffffffffc098646c>] sctp_outq_uncork+0x1c/0x20 [sctp]
   [<ffffffffc0977338>] sctp_cmd_interpreter.isra.22+0xc8/0x1460 [sctp]
   [<ffffffffc0976ad1>] sctp_do_sm+0xe1/0x350 [sctp]
   [<ffffffffc099443d>] sctp_primitive_ASCONF+0x3d/0x50 [sctp]
   [<ffffffffc0977384>] sctp_cmd_interpreter.isra.22+0x114/0x1460 [sctp]
   [<ffffffffc0976ad1>] sctp_do_sm+0xe1/0x350 [sctp]
   [<ffffffffc097b3a4>] sctp_assoc_bh_rcv+0xf4/0x1b0 [sctp]
   [<ffffffffc09840f1>] sctp_inq_push+0x51/0x70 [sctp]
   [<ffffffffc099732b>] sctp_rcv+0xa8b/0xbd0 [sctp]

As it shows, the first sctp_do_sm() running under atomic context (NET_RX
softirq) invoked sctp_primitive_ASCONF() that uses GFP_KERNEL flag later,
and this flag is supposed to be used in non-atomic context only. Besides,
sctp_do_sm() was called recursively, which is not expected.

Vlad tried to fix this recursive call in Commit c078669340 ("sctp: Fix
oops when sending queued ASCONF chunks") by introducing a new command
SCTP_CMD_SEND_NEXT_ASCONF. But it didn't work as this command is still
used in the first sctp_do_sm() call, and sctp_primitive_ASCONF() will
be called in this command again.

To avoid calling sctp_do_sm() recursively, we send the next queued ASCONF
not by sctp_primitive_ASCONF(), but by sctp_sf_do_prm_asconf() in the 1st
sctp_do_sm() directly.

Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01 09:18:57 -04:00
..
associola.c sctp: add SCTP_FUTURE_ASSOC for SCTP_PEER_ADDR_THLDS sockopt 2019-01-30 00:44:06 -08:00
auth.c sctp: move up sctp_auth_init_hmacs() in sctp_endpoint_init() 2019-03-08 11:42:49 -08:00
bind_addr.c sctp: add sock_reuseport for the sock in __sctp_hash_endpoint 2018-11-12 09:09:51 -08:00
chunk.c sctp: chunk.c: correct format string for size_t in printk 2019-02-28 10:33:40 -08:00
debug.c sctp: add SCTP_CID_I_DATA and SCTP_CID_I_FWD_TSN conversion in sctp_cname 2018-02-12 11:40:01 -05:00
diag.c inet_diag: fix reporting cgroup classid and fallback to priority 2019-02-12 13:35:57 -05:00
endpointola.c sctp: move up sctp_auth_init_hmacs() in sctp_endpoint_init() 2019-03-08 11:42:49 -08:00
input.c sctp: add sock_reuseport for the sock in __sctp_hash_endpoint 2018-11-12 09:09:51 -08:00
inqueue.c sctp: fix the issue that the cookie-ack with auth can't get processed 2018-05-02 11:15:33 -04:00
ipv6.c sctp: set flow sport from saddr only when it's 0 2019-01-24 18:13:57 -08:00
Kconfig sctp: whitespace fixes 2018-07-24 14:10:42 -07:00
Makefile sctp: rename sctp_diag.c as diag.c 2018-02-13 13:56:31 -05:00
objcnt.c proc: introduce proc_create_seq{,_data} 2018-05-16 07:23:35 +02:00
offload.c sctp: call gso_reset_checksum when computing checksum in sctp_gso_segment 2019-02-13 19:31:43 -05:00
output.c sctp: increase sk_wmem_alloc when head->truesize is increased 2018-11-27 15:42:31 -08:00
outqueue.c sctp: add SCTP_FUTURE_ASOC and SCTP_CURRENT_ASSOC for SCTP_STREAM_SCHEDULER sockopt 2019-01-30 00:44:08 -08:00
primitive.c sctp: rename enum sctp_event to sctp_event_type 2018-11-19 12:25:43 -08:00
proc.c sctp: remove useless start_fail from sctp_ht_iter in proc 2018-08-27 15:13:17 -07:00
protocol.c sctp: initialize _pad of sockaddr_in before copying to user memory 2019-04-01 18:08:19 -07:00
sm_make_chunk.c sctp: set chunk transport correctly when it's a new asoc 2019-01-24 18:13:57 -08:00
sm_sideeffect.c sctp: avoid running the sctp state machine recursively 2019-05-01 09:18:57 -04:00
sm_statefuns.c sctp: avoid running the sctp state machine recursively 2019-05-01 09:18:57 -04:00
sm_statetable.c sctp: rename enum sctp_event to sctp_event_type 2018-11-19 12:25:43 -08:00
socket.c sctp: Check address length before reading address family 2019-04-12 10:25:03 -07:00
stream_interleave.c sctp: convert to genradix 2019-03-12 10:04:02 -07:00
stream_sched_prio.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream_sched_rr.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream_sched.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream.c sctp: convert to genradix 2019-03-12 10:04:02 -07:00
sysctl.c sctp: support sysctl to allow users to use stream interleave 2017-12-15 13:52:22 -05:00
transport.c sctp: don't compare hb_timer expire date before starting it 2019-02-22 11:11:54 -08:00
tsnmap.c
ulpevent.c sctp: remove sctp_chunk_put from fail_mark err path in sctp_ulpevent_make_rcvmsg 2018-05-10 17:48:36 -04:00
ulpqueue.c sctp: add subscribe per asoc 2018-11-19 12:25:43 -08:00