Hi.
I would like to nominate 4.1 commit
69828dce7af2cb6d08ef5a03de687d422fb7ec1f for backport to stable
branches.
commit 69828dce7af2cb6d08ef5a03de687d422fb7ec1f
Author: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Date: Thu Apr 16 12:47:35 2015 -0700
signal: remove warning about using SI_TKILL in rt_[tg]sigqueueinfo
Sending SI_TKILL from rt_[tg]sigqueueinfo was deprecated, so now we issue
a warning on the first attempt of doing it. We use WARN_ON_ONCE, which is
not informative and, what is worse, taints the kernel, making the trinity
syscall fuzzer complain false-positively from time to time.
It does not look like we need this warning at all, because the behaviour
changed quite a long time ago (2.6.39), and if an application relies on
the old API, it gets EPERM anyway and can issue a warning by itself.
So let us zap the warning in kernel.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
I trigger this warning with trinity as well on older kernels. For
example, this is a warning from a trinity run on a Ubuntu 3.16 kernel.
------------[ cut here ]------------
WARNING: CPU: 9 PID: 27056 at
/build/buildd/linux-lts-utopic-3.16.0/kernel/signal.c:3035
do_rt_tgsigqueueinfo+0xac/0xc0()
Modules linked in: l2tp_ppp(E) l2tp_netlink(E) l2tp_core(E) dccp_ipv4
dccp dlci(E) ipt_ULOG dn_rtmsg cmtp(E) kernelcapi(E) nfnetlink bnep(E)
sctp scsi_transport_iscsi rfcomm(E) hidp(E) can_bcm af_alg irda
af_rxrpc phonet ipx p8022 p8023 can_raw can appletalk psnap xfrm_user
bluetooth(E) 6lowpan_iphc nfc(E) pppoe pppox caif_socket(E) caif(E)
crc_ccitt llc2 vmw_vsock_vmci_transport vsock vmw_vmci atm af_key
xfrm_algo hfs(E) ip6table_filter ip6_tables xt_comment xt_state xt_LOG
xt_limit xt_tcpudp xt_addrtype iptable_filter iptable_mangle
iptable_raw iptable_nat nf_nat_ipv4 nf_nat ip_tables x_tables 8021q
mrp garp bridge stp llc squashfs nf_conntrack_ipv4 nf_defrag_ipv4
nf_conntrack xfs libcrc32c intel_rapl(E) x86_pkg_temp_thermal(E)
intel_powerclamp(E) coretemp(E) kvm_intel kvm crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw
gf128mul glue_helper aes_x86_64 ioatdma(E) sb_edac(E) lpc_ich(E)
edac_core(E) joydev mei_me(E) mei(E) shpchp(E) ipmi_si(E) mac_hid(E)
ipmi_devintf(E) ipmi_msghandler lp parport ses(E) enclosure(E) raid10
raid456 async_raid6_recov async_pq raid6_pq igb(E) hid_generic(E)
async_xor ixgbe(E) isci(E) xor mpt2sas(E) libsas dca(E)
i2c_algo_bit(E) async_memcpy usbhid(E) ptp async_tx mdio(E)
scsi_transport_sas hid(E) pps_core raid_class raid1 raid0 multipath
linear
CPU: 9 PID: 27056 Comm: trinity-c32 Tainted: G E
3.16.0-33-generic #44~14.04.1-Ubuntu
0000000000000009 ffff88080ebffe48 ffffffff81763720 0000000000000000
ffff88080ebffe80 ffffffff8106dd7d 0000000000000001 0000000000000101
00000000ffffffff 0000000000000129 0000000000000000 ffff88080ebffe90
Call Trace:
[<ffffffff81763720>] dump_stack+0x45/0x56
[<ffffffff8106dd7d>] warn_slowpath_common+0x7d/0xa0
[<ffffffff8106de5a>] warn_slowpath_null+0x1a/0x20
[<ffffffff8107f6dc>] do_rt_tgsigqueueinfo+0xac/0xc0
[<ffffffff8107f739>] SYSC_rt_tgsigqueueinfo+0x49/0x60
[<ffffffff8108174e>] SyS_rt_tgsigqueueinfo+0xe/0x10
[<ffffffff8176be6d>] system_call_fastpath+0x1a/0x1f
---[ end trace 87e1749467efbe95 ]---
Cheers,
Vinson
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