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SubjectRe: WARNING: refcount bug in sctp_wfree
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Hello,

syzbot tried to test the proposed patch but build/boot failed:

/platform/chrome/cros_kbd_led_backlight.o
CC drivers/media/rc/keymaps/rc-msi-digivox-iii.o
CC drivers/hid/hid-a4tech.o
CC drivers/md/dm-mpath.o
CC drivers/md/dm-round-robin.o
CC drivers/infiniband/sw/rxe/rxe_qp.o
CC drivers/staging/exfat/exfat_nls.o
CC drivers/md/dm-queue-length.o
CC drivers/infiniband/hw/mlx4/alias_GUID.o
CC drivers/gpu/drm/i915/display/dvo_ch7017.o
CC drivers/gpu/drm/i915/display/dvo_ch7xxx.o
CC drivers/staging/exfat/exfat_upcase.o
CC drivers/gpu/drm/i915/display/dvo_ivch.o
CC net/netfilter/xt_multiport.o
AR drivers/mailbox/built-in.a
CC drivers/hid/hid-axff.o
CC drivers/infiniband/hw/mlx4/sysfs.o
CC drivers/hid/hid-apple.o
CC drivers/infiniband/sw/rxe/rxe_cq.o
CC drivers/infiniband/sw/siw/siw_verbs.o
CC drivers/soundwire/mipi_disco.o
CC drivers/infiniband/hw/usnic/usnic_ib_sysfs.o
CC drivers/md/dm-service-time.o
CC drivers/media/rc/keymaps/rc-msi-tvanywhere.o
CC drivers/hid/hid-belkin.o
CC drivers/infiniband/sw/rxe/rxe_mr.o
AR drivers/infiniband/ulp/opa_vnic/built-in.a
AR drivers/infiniband/ulp/built-in.a
CC drivers/platform/chrome/cros_ec_chardev.o
CC drivers/ras/ras.o
AR drivers/extcon/built-in.a
AR drivers/isdn/mISDN/built-in.a
CC drivers/crypto/qat/qat_common/qat_uclo.o
AR drivers/isdn/built-in.a
CC drivers/infiniband/core/fmr_pool.o
CC drivers/platform/chrome/cros_ec_lightbar.o
CC drivers/ras/debugfs.o
CC net/netfilter/xt_nfacct.o
CC drivers/crypto/qat/qat_common/qat_hal.o
CC drivers/infiniband/sw/rxe/rxe_opcode.o
CC drivers/soundwire/stream.o
CC drivers/crypto/qat/qat_common/adf_transport_debug.o
CC drivers/hid/hid-cherry.o
CC drivers/gpu/drm/i915/display/dvo_ns2501.o
CC drivers/soundwire/debugfs.o
CC net/netfilter/xt_osf.o
CC drivers/infiniband/hw/usnic/usnic_ib_verbs.o
CC drivers/infiniband/core/cache.o
CC drivers/thunderbolt/nhi.o
CC drivers/infiniband/hw/usnic/usnic_debugfs.o
CC drivers/hid/hid-chicony.o
CC drivers/media/rc/keymaps/rc-msi-tvanywhere-plus.o
CC drivers/media/rc/keymaps/rc-nebula.o
AR drivers/hwtracing/intel_th/built-in.a
CC drivers/thunderbolt/nhi_ops.o
CC drivers/hid/hid-cypress.o
CC drivers/hid/hid-dr.o
CC drivers/infiniband/core/netlink.o
CC drivers/platform/chrome/cros_ec_debugfs.o
CC drivers/crypto/qat/qat_common/adf_sriov.o
CC drivers/platform/chrome/cros_ec_sysfs.o
CC drivers/infiniband/sw/rxe/rxe_mmap.o
CC drivers/android/binder.o
CC drivers/android/binder_alloc.o
CC drivers/hid/hid-emsff.o
CC drivers/infiniband/sw/rxe/rxe_icrc.o
CC drivers/hid/hid-elecom.o
CC drivers/hid/hid-ezkey.o
CC drivers/hid/hid-google-hammer.o
CC drivers/media/rc/keymaps/rc-nec-terratec-cinergy-xs.o
CC drivers/md/dm-snap.o
CC net/netfilter/xt_owner.o
CC drivers/infiniband/core/roce_gid_mgmt.o
CC drivers/infiniband/core/mr_pool.o
CC drivers/hid/hid-gyration.o
CC drivers/hid/hid-holtek-kbd.o
CC drivers/hid/hid-holtek-mouse.o
CC net/netfilter/xt_cgroup.o
CC drivers/nvmem/core.o
CC drivers/gpu/drm/i915/display/dvo_sil164.o
CC drivers/gpu/drm/i915/display/dvo_tfp410.o
CC drivers/crypto/qat/qat_common/adf_pf2vf_msg.o
CC drivers/nvmem/nvmem-sysfs.o
CC drivers/counter/counter.o
CC drivers/crypto/qat/qat_common/adf_vf2pf_msg.o
CC drivers/thunderbolt/ctl.o
CC drivers/infiniband/sw/rxe/rxe_mcast.o
CC drivers/gpu/drm/i915/display/icl_dsi.o
CC drivers/thunderbolt/tb.o
CC drivers/gpu/drm/i915/display/intel_crt.o
CC drivers/md/dm-exception-store.o
CC drivers/thunderbolt/switch.o
CC drivers/media/rc/keymaps/rc-norwood.o
CC drivers/infiniband/sw/rxe/rxe_task.o
CC drivers/infiniband/sw/rxe/rxe_net.o
CC drivers/infiniband/sw/rxe/rxe_sysfs.o
CC net/netfilter/xt_physdev.o
AR drivers/platform/chrome/built-in.a
CC drivers/crypto/qat/qat_common/adf_vf_isr.o
CC drivers/media/rc/keymaps/rc-npgtech.o
AR drivers/platform/built-in.a
CC drivers/media/rc/keymaps/rc-odroid.o
CC drivers/infiniband/core/sa_query.o
CC drivers/infiniband/core/addr.o
CC drivers/media/rc/keymaps/rc-pctv-sedna.o
CC drivers/infiniband/sw/rxe/rxe_hw_counters.o
CC drivers/media/rc/keymaps/rc-pinnacle-color.o
CC net/netfilter/xt_pkttype.o
CC net/netfilter/xt_policy.o
CC drivers/media/rc/keymaps/rc-pinnacle-grey.o
CC net/netfilter/xt_quota.o
CC drivers/hid/hid-holtekff.o
CC drivers/hid/hid-ite.o
CC drivers/thunderbolt/cap.o
CC net/netfilter/xt_rateest.o
CC drivers/thunderbolt/path.o
CC drivers/thunderbolt/tunnel.o
CC drivers/gpu/drm/i915/display/intel_ddi.o
CC net/netfilter/xt_realm.o
AR drivers/vhost/built-in.a
CC drivers/thunderbolt/eeprom.o
AR drivers/ras/built-in.a
CC drivers/gpu/drm/i915/display/intel_dp.o
CC drivers/gpu/drm/i915/display/intel_dp_aux_backlight.o
CC drivers/thunderbolt/domain.o
CC drivers/thunderbolt/dma_port.o
CC drivers/gpu/drm/i915/display/intel_dp_link_training.o
CC drivers/thunderbolt/icm.o
CC drivers/hid/hid-kensington.o
CC drivers/hid/hid-keytouch.o
AR drivers/soundwire/built-in.a
CC drivers/infiniband/core/multicast.o
AR drivers/staging/exfat/built-in.a
AR drivers/staging/built-in.a
CC drivers/gpu/drm/i915/display/intel_dp_mst.o
CC drivers/md/dm-snap-transient.o
CC drivers/hid/hid-kye.o
CC drivers/md/dm-snap-persistent.o
AR drivers/infiniband/hw/usnic/built-in.a
CC drivers/md/dm-raid1.o
CC drivers/md/dm-log.o
AR drivers/infiniband/sw/siw/built-in.a
CC drivers/md/dm-region-hash.o
CC drivers/thunderbolt/property.o
CC drivers/media/rc/keymaps/rc-pinnacle-pctv-hd.o
CC drivers/thunderbolt/xdomain.o
CC drivers/hid/hid-lcpower.o
CC drivers/gpu/drm/i915/display/intel_dsi.o
CC drivers/media/rc/keymaps/rc-pixelview.o
CC drivers/hid/hid-lg.o
CC drivers/media/rc/keymaps/rc-pixelview-mk12.o
CC drivers/media/rc/keymaps/rc-pixelview-002t.o
CC drivers/hid/hid-lgff.o
CC drivers/thunderbolt/lc.o
CC drivers/infiniband/core/mad.o
CC net/netfilter/xt_recent.o
CC drivers/infiniband/core/smi.o
CC drivers/md/dm-zero.o
CC drivers/media/rc/keymaps/rc-pixelview-new.o
CC net/netfilter/xt_sctp.o
CC drivers/infiniband/core/agent.o
CC net/netfilter/xt_socket.o
CC drivers/media/rc/keymaps/rc-powercolor-real-angel.o
CC drivers/md/dm-raid.o
AR drivers/crypto/qat/qat_common/built-in.a
CC drivers/md/dm-thin.o
AR drivers/nvmem/built-in.a
AR drivers/crypto/qat/built-in.a
CC drivers/hid/hid-lg2ff.o
AR drivers/crypto/built-in.a
CC net/netfilter/xt_state.o
CC drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.o
CC net/netfilter/xt_statistic.o
CC drivers/hid/hid-lg3ff.o
CC drivers/hid/hid-lg4ff.o
CC drivers/thunderbolt/tmu.o
CC drivers/hid/hid-lg-g15.o
CC net/netfilter/xt_string.o
CC drivers/thunderbolt/usb4.o
CC net/netfilter/xt_tcpmss.o
CC drivers/gpu/drm/i915/display/intel_dsi_vbt.o
CC drivers/gpu/drm/i915/display/intel_dvo.o
CC drivers/md/dm-thin-metadata.o
CC drivers/md/dm-verity-fec.o
CC drivers/md/dm-verity-target.o
CC drivers/hid/hid-logitech-dj.o
CC drivers/media/rc/keymaps/rc-proteus-2309.o
CC drivers/md/dm-cache-target.o
AR drivers/counter/built-in.a
CC drivers/md/dm-cache-metadata.o
CC drivers/gpu/drm/i915/display/intel_gmbus.o
CC drivers/hid/hid-logitech-hidpp.o
CC drivers/hid/hid-magicmouse.o
CC drivers/gpu/drm/i915/display/intel_hdmi.o
CC drivers/gpu/drm/i915/display/intel_lspcon.o
AR drivers/infiniband/sw/rxe/built-in.a
CC drivers/infiniband/core/mad_rmpp.o
CC drivers/media/rc/keymaps/rc-purpletv.o
CC drivers/gpu/drm/i915/display/intel_lvds.o
CC drivers/md/dm-cache-policy.o
CC drivers/infiniband/core/nldev.o
CC drivers/infiniband/core/restrack.o
CC net/netfilter/xt_time.o
CC net/netfilter/xt_u32.o
CC drivers/infiniband/core/counters.o
CC drivers/hid/hid-microsoft.o
CC drivers/hid/hid-monterey.o
CC drivers/media/rc/keymaps/rc-pv951.o
CC drivers/hid/hid-multitouch.o
CC drivers/media/rc/keymaps/rc-hauppauge.o
CC drivers/hid/hid-ntrig.o
AR drivers/infiniband/sw/rdmavt/built-in.a
AR drivers/infiniband/sw/built-in.a
CC drivers/hid/hid-ortek.o
CC drivers/gpu/drm/i915/display/intel_panel.o
CC drivers/infiniband/core/ib_core_uverbs.o
CC drivers/media/rc/keymaps/rc-real-audio-220-32-keys.o
CC drivers/media/rc/keymaps/rc-rc6-mce.o
CC drivers/gpu/drm/i915/display/intel_sdvo.o
CC drivers/md/dm-cache-background-tracker.o
CC drivers/hid/hid-prodikeys.o
CC drivers/gpu/drm/i915/display/intel_tv.o
CC drivers/media/rc/keymaps/rc-reddo.o
CC drivers/media/rc/keymaps/rc-snapstream-firefly.o
CC drivers/media/rc/keymaps/rc-streamzap.o
CC drivers/md/dm-cache-policy-smq.o
CC drivers/hid/hid-pl.o
CC drivers/gpu/drm/i915/display/intel_vdsc.o
CC drivers/gpu/drm/i915/display/vlv_dsi.o
CC drivers/hid/hid-petalynx.o
CC drivers/hid/hid-picolcd_core.o
CC drivers/media/rc/keymaps/rc-tango.o
CC drivers/md/dm-clone-target.o
CC drivers/media/rc/keymaps/rc-tanix-tx3mini.o
CC drivers/hid/hid-picolcd_debugfs.o
CC drivers/md/dm-clone-metadata.o
CC drivers/md/dm-integrity.o
CC drivers/md/dm-zoned-target.o
CC drivers/hid/hid-plantronics.o
CC drivers/gpu/drm/i915/display/vlv_dsi_pll.o
CC drivers/md/dm-zoned-metadata.o
AR drivers/thunderbolt/built-in.a
CC drivers/hid/hid-primax.o
CC drivers/media/rc/keymaps/rc-tanix-tx5max.o
CC drivers/infiniband/core/trace.o
CC drivers/infiniband/core/security.o
CC drivers/gpu/drm/i915/oa/i915_oa_hsw.o
CC drivers/md/dm-zoned-reclaim.o
CC drivers/gpu/drm/i915/oa/i915_oa_bdw.o
CC drivers/media/rc/keymaps/rc-tbs-nec.o
CC drivers/media/rc/keymaps/rc-technisat-ts35.o
CC drivers/md/dm-writecache.o
CC drivers/gpu/drm/i915/oa/i915_oa_chv.o
CC drivers/hid/hid-roccat.o
AR net/netfilter/built-in.a
CC drivers/infiniband/core/cgroup.o
Makefile:1683: recipe for target 'net' failed
make: *** [net] Error 2
make: *** Waiting for unfinished jobs....
CC drivers/media/rc/keymaps/rc-technisat-usb2.o
CC drivers/media/rc/keymaps/rc-terratec-cinergy-c-pci.o
AR drivers/infiniband/hw/mlx4/built-in.a
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt2.o
AR drivers/infiniband/hw/built-in.a
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt3.o
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt4.o
CC drivers/hid/hid-roccat-common.o
CC drivers/infiniband/core/cm.o
CC drivers/gpu/drm/i915/oa/i915_oa_bxt.o
CC drivers/gpu/drm/i915/oa/i915_oa_kblgt2.o
CC drivers/gpu/drm/i915/oa/i915_oa_kblgt3.o
CC drivers/media/rc/keymaps/rc-terratec-cinergy-s2-hd.o
CC drivers/media/rc/keymaps/rc-terratec-cinergy-xs.o
CC drivers/media/rc/keymaps/rc-terratec-slim.o
CC drivers/media/rc/keymaps/rc-terratec-slim-2.o
CC drivers/infiniband/core/iwcm.o
CC drivers/infiniband/core/iwpm_util.o
CC drivers/infiniband/core/iwpm_msg.o
CC drivers/media/rc/keymaps/rc-tevii-nec.o
CC drivers/media/rc/keymaps/rc-tivo.o
CC drivers/gpu/drm/i915/oa/i915_oa_glk.o
CC drivers/gpu/drm/i915/oa/i915_oa_cflgt2.o
CC drivers/hid/hid-roccat-arvo.o
CC drivers/infiniband/core/cma.o
CC drivers/gpu/drm/i915/oa/i915_oa_cflgt3.o
CC drivers/hid/hid-roccat-isku.o
CC drivers/infiniband/core/cma_trace.o
CC drivers/media/rc/keymaps/rc-total-media-in-hand.o
CC drivers/media/rc/keymaps/rc-total-media-in-hand-02.o
CC drivers/hid/hid-roccat-kone.o
CC drivers/media/rc/keymaps/rc-trekstor.o
CC drivers/infiniband/core/cma_configfs.o
CC drivers/infiniband/core/user_mad.o
CC drivers/infiniband/core/uverbs_main.o
CC drivers/hid/hid-roccat-koneplus.o
CC drivers/media/rc/keymaps/rc-tt-1500.o
CC drivers/infiniband/core/uverbs_cmd.o
CC drivers/infiniband/core/uverbs_marshall.o
CC drivers/hid/hid-roccat-konepure.o
CC drivers/hid/hid-roccat-kovaplus.o
CC drivers/media/rc/keymaps/rc-twinhan-dtv-cab-ci.o
CC drivers/gpu/drm/i915/oa/i915_oa_cnl.o
CC drivers/gpu/drm/i915/oa/i915_oa_icl.o
CC drivers/infiniband/core/rdma_core.o
CC drivers/hid/hid-roccat-lua.o
CC drivers/hid/hid-roccat-pyra.o
CC drivers/hid/hid-roccat-ryos.o
CC drivers/infiniband/core/uverbs_std_types.o
CC drivers/media/rc/keymaps/rc-twinhan1027.o
CC drivers/gpu/drm/i915/oa/i915_oa_tgl.o
CC drivers/infiniband/core/uverbs_ioctl.o
CC drivers/gpu/drm/i915/i915_perf.o
CC drivers/gpu/drm/i915/i915_gpu_error.o
CC drivers/media/rc/keymaps/rc-vega-s9x.o
CC drivers/gpu/drm/i915/i915_vgpu.o
CC drivers/hid/hid-roccat-savu.o
CC drivers/hid/hid-rmi.o
CC drivers/media/rc/keymaps/rc-videomate-m1f.o
CC drivers/hid/hid-saitek.o
CC drivers/hid/hid-samsung.o
CC drivers/hid/hid-sjoy.o
CC drivers/infiniband/core/uverbs_std_types_cq.o
CC drivers/infiniband/core/uverbs_std_types_flow_action.o
CC drivers/infiniband/core/uverbs_std_types_dm.o
CC drivers/infiniband/core/uverbs_std_types_mr.o
CC drivers/hid/hid-sony.o
CC drivers/infiniband/core/uverbs_std_types_counters.o
CC drivers/hid/hid-speedlink.o
CC drivers/infiniband/core/uverbs_uapi.o
CC drivers/infiniband/core/uverbs_std_types_device.o
CC drivers/infiniband/core/uverbs_std_types_async_fd.o
CC drivers/hid/hid-sunplus.o
CC drivers/infiniband/core/umem.o
CC drivers/media/rc/keymaps/rc-videomate-s350.o
CC drivers/hid/hid-gaff.o
CC drivers/infiniband/core/umem_odp.o
CC drivers/infiniband/core/ucma.o
CC drivers/media/rc/keymaps/rc-videomate-tv-pvr.o
CC drivers/hid/hid-tmff.o
CC drivers/hid/hid-tivo.o
CC drivers/media/rc/keymaps/rc-wetek-hub.o
CC drivers/media/rc/keymaps/rc-wetek-play2.o
CC drivers/hid/hid-topseed.o
CC drivers/media/rc/keymaps/rc-winfast.o
CC drivers/media/rc/keymaps/rc-winfast-usbii-deluxe.o
CC drivers/media/rc/keymaps/rc-su3000.o
CC drivers/hid/hid-twinhan.o
CC drivers/hid/hid-uclogic-core.o
CC drivers/hid/hid-uclogic-rdesc.o
CC drivers/hid/hid-uclogic-params.o
CC drivers/media/rc/keymaps/rc-xbox-dvd.o
CC drivers/media/rc/keymaps/rc-x96max.o
CC drivers/media/rc/keymaps/rc-zx-irdec.o
CC drivers/hid/hid-zpff.o
CC drivers/hid/hid-led.o
CC drivers/hid/wacom_wac.o
CC drivers/hid/hid-zydacron.o
CC drivers/hid/wacom_sys.o
CC drivers/hid/hid-waltop.o
CC drivers/hid/hid-wiimote-core.o
CC drivers/hid/hid-wiimote-modules.o
CC drivers/hid/hid-wiimote-debug.o
AR drivers/media/rc/keymaps/built-in.a
AR drivers/media/rc/built-in.a
AR drivers/media/built-in.a
AR drivers/android/built-in.a
AR drivers/gpu/drm/i915/built-in.a
AR drivers/gpu/drm/built-in.a
AR drivers/gpu/built-in.a
AR drivers/md/built-in.a
AR drivers/hid/built-in.a
AR drivers/infiniband/core/built-in.a
AR drivers/infiniband/built-in.a
AR drivers/built-in.a


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1718bb81e00000


Tested on:

commit: 110ca3ce fix
git tree: https://github.com/hqj/hqjagain_test.git sctp_wfree
dashboard link: https://syzkaller.appspot.com/bug?extid=cea71eec5d6de256d54d
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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  Last update: 2020-03-15 03:32    [W:0.068 / U:0.600 seconds]
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