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e5d5aadcf3
We got the following WARNING when running ab/nginx
test with RDMA link flapping (up-down-up).
The reason is when smc_sock fallback and at linkdown
happens simultaneously, we may got the following situation:
__smc_lgr_terminate()
--> smc_conn_kill()
--> smc_close_active_abort()
smc_sock->sk_state = SMC_CLOSED
sock_put(smc_sock)
smc_sock was set to SMC_CLOSED and sock_put() been called
when terminate the link group. But later application call
close() on the socket, then we got:
__smc_release():
if (smc_sock->fallback)
smc_sock->sk_state = SMC_CLOSED
sock_put(smc_sock)
Again we set the smc_sock to CLOSED through it's already
in CLOSED state, and double put the refcnt, so the following
warning happens:
refcount_t: underflow; use-after-free.
WARNING: CPU: 5 PID: 860 at lib/refcount.c:28 refcount_warn_saturate+0x8d/0xf0
Modules linked in:
CPU: 5 PID: 860 Comm: nginx Not tainted 5.10.46+ #403
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014
RIP: 0010:refcount_warn_saturate+0x8d/0xf0
Code: 05 5c 1e b5 01 01 e8 52 25 bc ff 0f 0b c3 80 3d 4f 1e b5 01 00 75 ad 48
RSP: 0018:ffffc90000527e50 EFLAGS: 00010286
RAX: 0000000000000026 RBX: ffff8881300df2c0 RCX: 0000000000000027
RDX: 0000000000000000 RSI: ffff88813bd58040 RDI: ffff88813bd58048
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000001
R10: ffff8881300df2c0 R11: ffffc90000527c78 R12: ffff8881300df340
R13: ffff8881300df930 R14: ffff88810b3dad80 R15: ffff8881300df4f8
FS: 00007f739de8fb80(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000a01b008 CR3: 0000000111b64003 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
smc_release+0x353/0x3f0
__sock_release+0x3d/0xb0
sock_close+0x11/0x20
__fput+0x93/0x230
task_work_run+0x65/0xa0
exit_to_user_mode_prepare+0xf9/0x100
syscall_exit_to_user_mode+0x27/0x190
entry_SYSCALL_64_after_hwframe+0x44/0xa9
This patch adds check in __smc_release() to make
sure we won't do an extra sock_put() and set the
socket to CLOSED when its already in CLOSED state.
Fixes:
|
||
|---|---|---|
| .. | ||
| af_smc.c | ||
| Kconfig | ||
| Makefile | ||
| smc_cdc.c | ||
| smc_cdc.h | ||
| smc_clc.c | ||
| smc_clc.h | ||
| smc_close.c | ||
| smc_close.h | ||
| smc_core.c | ||
| smc_core.h | ||
| smc_diag.c | ||
| smc_ib.c | ||
| smc_ib.h | ||
| smc_ism.c | ||
| smc_ism.h | ||
| smc_llc.c | ||
| smc_llc.h | ||
| smc_netlink.c | ||
| smc_netlink.h | ||
| smc_netns.h | ||
| smc_pnet.c | ||
| smc_pnet.h | ||
| smc_rx.c | ||
| smc_rx.h | ||
| smc_stats.c | ||
| smc_stats.h | ||
| smc_tracepoint.c | ||
| smc_tracepoint.h | ||
| smc_tx.c | ||
| smc_tx.h | ||
| smc_wr.c | ||
| smc_wr.h | ||
| smc.h | ||