FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master commit d46e416c11c88ef1deb5c7f19271806a5be597fe ("sctp: sctp should change socket state when shutdown is received") in testcase: ltp with following parameters: test=sctp on test machine: nhm-white2: 8 threads Nehalem with 4G memory caused below changes: +--------------------------------------------+------------+------------+ | | d6cf3a85b4 | d46e416c11 | +--------------------------------------------+------------+------------+ | boot_successes | 8 | 4 | | boot_failures | 0 | 4 | | WARNING:at_net/ipv4/af_inet.c:#inet_accept | 0 | 4 | | backtrace:SYSC_accept4 | 0 | 4 | | backtrace:SyS_accept | 0 | 4 | +--------------------------------------------+------------+------------+ [ 20.349151] loop: module loaded [ 20.376012] sctp: Hash tables configured (bind 256/256) [ 20.386724] ------------[ cut here ]------------ [ 20.386729] WARNING: CPU: 2 PID: 727 at net/ipv4/af_inet.c:685 inet_accept+0x10d/0x110 [ 20.386741] Modules linked in: sctp loop rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sg sr_mod cdrom sd_mod snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel coretemp ata_generic kvm_intel pata_acpi dcdbas kvm irqbypass crc32c_intel pcspkr serio_raw snd_hda_codec ata_piix snd_hda_core i7core_edac snd_hwdep firewire_ohci edac_core snd_pcm snd_timer libata snd firewire_core usb_storage crc_itu_t soundcore shpchp acpi_cpufreq broadcom bcm_phy_lib [ 20.386743] CPU: 2 PID: 727 Comm: test_1_to_1_sen Not tainted 4.7.0-rc2-00451-gd46e416 #1 [ 20.386743] Hardware name: Dell Inc. Studio XPS 8000/0X231R, BIOS A01 08/11/2009 [ 20.386745] 0000000000000000 ffff88013dcefde8 ffffffff81432a9a 0000000000000000 [ 20.386746] 0000000000000000 ffff88013dcefe28 ffffffff8107d681 000002ad810a38f9 [ 20.386747] ffff88008adb1f80 ffff88008cfc1680 00007ffc4717f2d0 ffff88008cfc1680 [ 20.386748] Call Trace: [ 20.386751] [<ffffffff81432a9a>] dump_stack+0x63/0x89 [ 20.386753] [<ffffffff8107d681>] __warn+0xd1/0xf0 [ 20.386754] [<ffffffff8107d76d>] warn_slowpath_null+0x1d/0x20 [ 20.386755] [<ffffffff81855bdd>] inet_accept+0x10d/0x110 [ 20.386757] [<ffffffff817bbf54>] SYSC_accept4+0xf4/0x1f0 [ 20.386760] [<ffffffff8109b1d7>] ? task_work_run+0x97/0xb0 [ 20.386762] [<ffffffff810032f6>] ? exit_to_usermode_loop+0xa6/0xd0 [ 20.386763] [<ffffffff817bd9b0>] SyS_accept+0x10/0x20 [ 20.386766] [<ffffffff81917372>] entry_SYSCALL_64_fastpath+0x1a/0xa4 [ 20.386767] ---[ end trace 01a3b462e1c6ce80 ]--- [ 20.587733] ------------[ cut here ]------------ To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong