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SubjectRe: general protection fault in syscall_return_slowpath
From
Hello,

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

e.o
CC fs/xfs/libxfs/xfs_refcount.o
CC fs/ceph/cache.o
CC fs/ocfs2/sysfile.o
CC fs/nfs/nfs4trace.o
CC fs/btrfs/extent_io.o
CC fs/btrfs/volumes.o
CC net/mac80211/mesh_sync.o
CC drivers/gpu/drm/drm_auth.o
CC fs/gfs2/recovery.o
CC fs/gfs2/rgrp.o
CC fs/btrfs/async-thread.o
CC drivers/gpu/drm/i915/gem/i915_gem_region.o
CC net/netfilter/xt_nat.o
CC fs/ocfs2/uptodate.o
AR net/vmw_vsock/built-in.a
CC fs/ocfs2/quota_local.o
CC fs/dcache.o
CC fs/inode.o
CC fs/afs/volume.o
CC fs/afs/write.o
CC fs/ceph/acl.o
CC fs/btrfs/ioctl.o
CC fs/btrfs/locking.o
CC fs/afs/xattr.o
CC net/netfilter/xt_AUDIT.o
CC fs/ocfs2/quota_global.o
CC fs/btrfs/orphan.o
CC fs/btrfs/export.o
CC net/netfilter/xt_CHECKSUM.o
CC fs/attr.o
CC net/netfilter/xt_CLASSIFY.o
CC drivers/gpu/drm/drm_cache.o
CC fs/bad_inode.o
CC fs/nfs/nfs4sysctl.o
CC drivers/gpu/drm/drm_file.o
CC fs/file.o
CC drivers/gpu/drm/i915/gem/i915_gem_shmem.o
CC drivers/gpu/drm/i915/gem/i915_gem_shrinker.o
CC drivers/gpu/drm/i915/gem/i915_gem_stolen.o
CC fs/gfs2/super.o
CC drivers/gpu/drm/i915/gem/i915_gem_throttle.o
CC fs/btrfs/tree-log.o
CC net/netfilter/xt_CONNSECMARK.o
CC fs/f2fs/xattr.o
CC fs/ocfs2/xattr.o
CC net/netfilter/xt_CT.o
CC net/mac80211/mesh_ps.o
CC fs/f2fs/acl.o
CC fs/filesystems.o
AR fs/erofs/built-in.a
CC fs/f2fs/verity.o
CC drivers/gpu/drm/drm_gem.o
CC fs/ocfs2/acl.o
CC fs/gfs2/sys.o
CC drivers/gpu/drm/drm_ioctl.o
CC fs/ocfs2/filecheck.o
CC fs/btrfs/free-space-cache.o
CC fs/namespace.o
CC drivers/gpu/drm/i915/gem/i915_gem_tiling.o
CC drivers/gpu/drm/drm_irq.o
CC fs/ocfs2/stack_o2cb.o
CC fs/ocfs2/stackglue.o
AR fs/ceph/built-in.a
CC drivers/gpu/drm/drm_memory.o
CC fs/btrfs/zlib.o
CC fs/btrfs/lzo.o
CC fs/nfs/pnfs.o
CC fs/gfs2/trans.o
CC fs/gfs2/util.o
CC fs/ocfs2/stack_user.o
CC fs/xfs/libxfs/xfs_refcount_btree.o
CC fs/xfs/libxfs/xfs_sb.o
CC net/netfilter/xt_DSCP.o
CC net/netfilter/xt_HL.o
CC drivers/gpu/drm/drm_drv.o
CC drivers/gpu/drm/drm_sysfs.o
CC fs/afs/yfsclient.o
CC fs/btrfs/zstd.o
CC fs/afs/proc.o
CC fs/f2fs/compress.o
CC fs/seq_file.o
CC fs/xattr.o
CC net/netfilter/xt_HMARK.o
CC net/mac80211/pm.o
CC drivers/gpu/drm/i915/gem/i915_gem_userptr.o
CC net/mac80211/rc80211_minstrel.o
CC net/mac80211/rc80211_minstrel_ht.o
CC fs/gfs2/lock_dlm.o
CC fs/nfs/pnfs_dev.o
CC fs/nfs/pnfs_nfs.o
CC fs/nfs/nfs42proc.o
CC fs/btrfs/compression.o
CC drivers/gpu/drm/i915/gem/i915_gem_wait.o
CC drivers/gpu/drm/i915/gem/i915_gemfs.o
CC net/mac80211/rc80211_minstrel_debugfs.o
CC net/mac80211/rc80211_minstrel_ht_debugfs.o
CC fs/btrfs/delayed-ref.o
CC drivers/gpu/drm/drm_hashtab.o
CC fs/xfs/libxfs/xfs_symlink_remote.o
CC fs/xfs/libxfs/xfs_trans_resv.o
CC net/netfilter/xt_LED.o
CC fs/xfs/libxfs/xfs_trans_inode.o
CC fs/xfs/libxfs/xfs_types.o
CC fs/btrfs/relocation.o
CC net/netfilter/xt_LOG.o
CC drivers/gpu/drm/drm_mm.o
CC net/netfilter/xt_NETMAP.o
CC net/netfilter/xt_NFLOG.o
CC net/netfilter/xt_NFQUEUE.o
CC net/netfilter/xt_RATEEST.o
CC drivers/gpu/drm/i915/i915_active.o
CC net/netfilter/xt_REDIRECT.o
CC fs/btrfs/delayed-inode.o
CC drivers/gpu/drm/i915/i915_buddy.o
CC fs/xfs/libxfs/xfs_rtbitmap.o
CC fs/btrfs/scrub.o
CC fs/libfs.o
CC drivers/gpu/drm/drm_crtc.o
CC drivers/gpu/drm/drm_fourcc.o
CC drivers/gpu/drm/drm_modes.o
CC drivers/gpu/drm/drm_edid.o
CC fs/fs-writeback.o
CC drivers/gpu/drm/i915/i915_cmd_parser.o
CC fs/pnode.o
CC fs/splice.o
CC drivers/gpu/drm/i915/i915_gem_evict.o
CC fs/sync.o
CC fs/utimes.o
CC fs/d_path.o
AR fs/gfs2/built-in.a
CC fs/xfs/xfs_aops.o
CC fs/xfs/xfs_attr_inactive.o
CC drivers/gpu/drm/i915/i915_gem_fence_reg.o
CC drivers/gpu/drm/i915/i915_gem_gtt.o
CC drivers/gpu/drm/i915/i915_gem.o
CC fs/btrfs/reada.o
CC fs/btrfs/backref.o
CC drivers/gpu/drm/drm_encoder_slave.o
CC drivers/gpu/drm/drm_trace_points.o
CC drivers/gpu/drm/drm_prime.o
CC drivers/gpu/drm/drm_rect.o
CC fs/stack.o
CC net/netfilter/xt_MASQUERADE.o
CC fs/xfs/xfs_attr_list.o
CC drivers/gpu/drm/drm_vma_manager.o
CC fs/xfs/xfs_bmap_util.o
CC fs/fs_struct.o
CC net/netfilter/xt_SECMARK.o
CC fs/xfs/xfs_bio_io.o
CC drivers/gpu/drm/i915/i915_globals.o
CC drivers/gpu/drm/i915/i915_query.o
CC fs/xfs/xfs_buf.o
CC fs/xfs/xfs_dir2_readdir.o
CC drivers/gpu/drm/i915/i915_request.o
CC drivers/gpu/drm/i915/i915_scheduler.o
CC drivers/gpu/drm/drm_flip_work.o
CC net/netfilter/xt_TPROXY.o
CC fs/statfs.o
CC fs/btrfs/ulist.o
CC drivers/gpu/drm/drm_modeset_lock.o
CC drivers/gpu/drm/drm_atomic.o
CC drivers/gpu/drm/drm_bridge.o
CC drivers/gpu/drm/drm_framebuffer.o
AR fs/afs/built-in.a
CC drivers/gpu/drm/drm_connector.o
CC drivers/gpu/drm/drm_blend.o
CC fs/xfs/xfs_discard.o
CC fs/fs_pin.o
CC drivers/gpu/drm/drm_encoder.o
CC fs/nsfs.o
CC drivers/gpu/drm/drm_mode_object.o
CC fs/fs_types.o
CC net/netfilter/xt_TCPMSS.o
CC fs/xfs/xfs_error.o
AR fs/f2fs/built-in.a
CC drivers/gpu/drm/drm_property.o
CC drivers/gpu/drm/i915/i915_trace_points.o
CC net/netfilter/xt_TCPOPTSTRIP.o
CC drivers/gpu/drm/i915/i915_vma.o
CC fs/btrfs/qgroup.o
CC fs/xfs/xfs_export.o
CC fs/xfs/xfs_extent_busy.o
CC drivers/gpu/drm/drm_plane.o
CC fs/fs_context.o
CC fs/fs_parser.o
CC fs/xfs/xfs_file.o
CC fs/btrfs/send.o
CC drivers/gpu/drm/drm_color_mgmt.o
CC fs/btrfs/dev-replace.o
CC drivers/gpu/drm/i915/intel_region_lmem.o
CC fs/buffer.o
CC fs/fsopen.o
CC fs/xfs/xfs_filestream.o
CC fs/xfs/xfs_fsmap.o
CC fs/block_dev.o
CC drivers/gpu/drm/i915/intel_wopcm.o
CC fs/btrfs/uuid-tree.o
CC fs/btrfs/raid56.o
CC drivers/gpu/drm/drm_print.o
CC fs/xfs/xfs_fsops.o
CC drivers/gpu/drm/i915/gt/uc/intel_uc.o
CC net/netfilter/xt_TEE.o
CC net/netfilter/xt_TRACE.o
CC net/netfilter/xt_IDLETIMER.o
CC net/netfilter/xt_addrtype.o
CC drivers/gpu/drm/drm_dumb_buffers.o
CC fs/direct-io.o
CC net/netfilter/xt_bpf.o
CC net/netfilter/xt_cluster.o
CC drivers/gpu/drm/drm_mode_config.o
CC fs/btrfs/props.o
CC fs/xfs/xfs_globals.o
CC drivers/gpu/drm/drm_vblank.o
AR net/mac80211/built-in.a
CC fs/xfs/xfs_health.o
CC drivers/gpu/drm/drm_syncobj.o
CC fs/mpage.o
CC fs/xfs/xfs_icache.o
CC drivers/gpu/drm/drm_lease.o
CC fs/proc_namespace.o
CC fs/btrfs/free-space-tree.o
CC drivers/gpu/drm/i915/gt/uc/intel_uc_fw.o
CC fs/eventpoll.o
CC fs/anon_inodes.o
CC fs/signalfd.o
CC fs/btrfs/tree-checker.o
CC fs/btrfs/space-info.o
CC fs/xfs/xfs_ioctl.o
CC fs/xfs/xfs_iomap.o
CC drivers/gpu/drm/drm_writeback.o
CC fs/btrfs/block-rsv.o
CC fs/xfs/xfs_iops.o
CC drivers/gpu/drm/drm_client.o
CC fs/xfs/xfs_inode.o
CC drivers/gpu/drm/drm_client_modeset.o
CC fs/xfs/xfs_itable.o
CC fs/btrfs/delalloc-space.o
CC drivers/gpu/drm/drm_atomic_uapi.o
CC net/netfilter/xt_comment.o
CC drivers/gpu/drm/drm_hdcp.o
CC net/netfilter/xt_connbytes.o
CC fs/xfs/xfs_iwalk.o
AR fs/nfs/built-in.a
CC drivers/gpu/drm/i915/gt/uc/intel_guc.o
CC drivers/gpu/drm/drm_ioc32.o
CC fs/btrfs/block-group.o
CC net/netfilter/xt_connlabel.o
CC fs/timerfd.o
CC net/netfilter/xt_connlimit.o
CC fs/xfs/xfs_message.o
CC fs/btrfs/discard.o
CC fs/btrfs/acl.o
CC drivers/gpu/drm/drm_gem_shmem_helper.o
CC fs/xfs/xfs_mount.o
CC fs/eventfd.o
CC drivers/gpu/drm/drm_panel.o
CC net/netfilter/xt_conntrack.o
CC drivers/gpu/drm/drm_agpsupport.o
CC fs/userfaultfd.o
CC net/netfilter/xt_cpu.o
CC net/netfilter/xt_devgroup.o
CC net/netfilter/xt_dccp.o
CC drivers/gpu/drm/i915/gt/uc/intel_guc_ads.o
CC net/netfilter/xt_dscp.o
CC fs/aio.o
CC drivers/gpu/drm/i915/gt/uc/intel_guc_ct.o
CC fs/xfs/xfs_mru_cache.o
CC fs/io_uring.o
CC drivers/gpu/drm/drm_pci.o
CC drivers/gpu/drm/drm_debugfs.o
CC net/netfilter/xt_ecn.o
CC drivers/gpu/drm/i915/gt/uc/intel_guc_fw.o
CC fs/io-wq.o
CC drivers/gpu/drm/drm_debugfs_crc.o
CC fs/dax.o
CC fs/xfs/xfs_pwork.o
CC fs/xfs/xfs_reflink.o
CC drivers/gpu/drm/drm_mipi_dsi.o
CC fs/locks.o
CC fs/xfs/xfs_stats.o
CC net/netfilter/xt_esp.o
CC fs/xfs/xfs_super.o
CC net/netfilter/xt_hashlimit.o
CC fs/compat.o
CC net/netfilter/xt_helper.o
CC fs/binfmt_misc.o
CC drivers/gpu/drm/drm_panel_orientation_quirks.o
CC drivers/gpu/drm/i915/gt/uc/intel_guc_log.o
CC drivers/gpu/drm/i915/gt/uc/intel_guc_submission.o
CC net/netfilter/xt_hl.o
CC fs/binfmt_script.o
CC net/netfilter/xt_ipcomp.o
CC net/netfilter/xt_iprange.o
CC fs/binfmt_elf.o
CC fs/compat_binfmt_elf.o
CC net/netfilter/xt_ipvs.o
CC net/netfilter/xt_l2tp.o
CC fs/mbcache.o
CC net/netfilter/xt_length.o
CC net/netfilter/xt_limit.o
CC net/netfilter/xt_mac.o
CC drivers/gpu/drm/i915/gt/uc/intel_huc.o
CC fs/posix_acl.o
CC fs/drop_caches.o
CC fs/coredump.o
CC drivers/gpu/drm/i915/gt/uc/intel_huc_fw.o
CC fs/xfs/xfs_symlink.o
CC fs/fhandle.o
CC drivers/gpu/drm/i915/display/intel_atomic.o
CC fs/dcookies.o
CC fs/xfs/xfs_sysfs.o
CC drivers/gpu/drm/i915/display/intel_atomic_plane.o
CC fs/xfs/xfs_trans.o
CC fs/xfs/xfs_xattr.o
CC net/netfilter/xt_multiport.o
CC net/netfilter/xt_nfacct.o
CC net/netfilter/xt_osf.o
CC drivers/gpu/drm/i915/display/intel_audio.o
CC net/netfilter/xt_owner.o
CC net/netfilter/xt_cgroup.o
CC fs/xfs/kmem.o
CC drivers/gpu/drm/i915/display/intel_bios.o
AR fs/ocfs2/built-in.a
CC fs/xfs/xfs_log.o
CC fs/xfs/xfs_log_cil.o
CC drivers/gpu/drm/i915/display/intel_bw.o
CC drivers/gpu/drm/i915/display/intel_cdclk.o
CC drivers/gpu/drm/i915/display/intel_color.o
CC fs/xfs/xfs_bmap_item.o
CC drivers/gpu/drm/i915/display/intel_combo_phy.o
CC fs/xfs/xfs_buf_item.o
CC net/netfilter/xt_physdev.o
CC drivers/gpu/drm/i915/display/intel_connector.o
CC fs/xfs/xfs_extfree_item.o
CC drivers/gpu/drm/i915/display/intel_display.o
CC net/netfilter/xt_pkttype.o
CC net/netfilter/xt_policy.o
CC drivers/gpu/drm/i915/display/intel_display_power.o
CC fs/xfs/xfs_icreate_item.o
CC fs/xfs/xfs_inode_item.o
CC drivers/gpu/drm/i915/display/intel_dpio_phy.o
CC drivers/gpu/drm/i915/display/intel_dpll_mgr.o
CC fs/xfs/xfs_refcount_item.o
CC net/netfilter/xt_quota.o
CC drivers/gpu/drm/i915/display/intel_dsb.o
CC net/netfilter/xt_rateest.o
CC net/netfilter/xt_realm.o
CC drivers/gpu/drm/i915/display/intel_fbc.o
CC drivers/gpu/drm/i915/display/intel_fifo_underrun.o
CC fs/xfs/xfs_rmap_item.o
CC fs/xfs/xfs_log_recover.o
CC net/netfilter/xt_recent.o
CC net/netfilter/xt_sctp.o
CC fs/xfs/xfs_trans_ail.o
CC net/netfilter/xt_socket.o
CC drivers/gpu/drm/i915/display/intel_frontbuffer.o
CC drivers/gpu/drm/i915/display/intel_hdcp.o
CC fs/xfs/xfs_trans_buf.o
CC net/netfilter/xt_state.o
CC drivers/gpu/drm/i915/display/intel_hotplug.o
CC net/netfilter/xt_statistic.o
CC fs/xfs/xfs_dquot.o
CC net/netfilter/xt_string.o
CC net/netfilter/xt_tcpmss.o
CC net/netfilter/xt_time.o
CC fs/xfs/xfs_dquot_item.o
CC fs/xfs/xfs_trans_dquot.o
CC fs/xfs/xfs_qm_syscalls.o
CC drivers/gpu/drm/i915/display/intel_lpe_audio.o
CC net/netfilter/xt_u32.o
CC fs/xfs/xfs_qm_bhv.o
CC drivers/gpu/drm/i915/display/intel_overlay.o
CC drivers/gpu/drm/i915/display/intel_psr.o
CC fs/xfs/xfs_qm.o
CC drivers/gpu/drm/i915/display/intel_quirks.o
CC fs/xfs/xfs_quotaops.o
CC fs/xfs/xfs_rtalloc.o
CC fs/xfs/xfs_acl.o
CC fs/xfs/xfs_sysctl.o
CC fs/xfs/xfs_ioctl32.o
CC fs/xfs/xfs_pnfs.o
CC drivers/gpu/drm/i915/display/intel_sprite.o
CC drivers/gpu/drm/i915/display/intel_tc.o
CC drivers/gpu/drm/i915/display/intel_vga.o
CC drivers/gpu/drm/i915/display/intel_acpi.o
CC drivers/gpu/drm/i915/display/intel_opregion.o
CC drivers/gpu/drm/i915/display/intel_fbdev.o
CC drivers/gpu/drm/i915/display/dvo_ch7017.o
CC drivers/gpu/drm/i915/display/dvo_ch7xxx.o
CC drivers/gpu/drm/i915/display/dvo_ivch.o
CC drivers/gpu/drm/i915/display/dvo_ns2501.o
CC drivers/gpu/drm/i915/display/dvo_sil164.o
CC drivers/gpu/drm/i915/display/dvo_tfp410.o
CC drivers/gpu/drm/i915/display/icl_dsi.o
CC drivers/gpu/drm/i915/display/intel_crt.o
CC drivers/gpu/drm/i915/display/intel_ddi.o
CC drivers/gpu/drm/i915/display/intel_dp.o
CC drivers/gpu/drm/i915/display/intel_dp_aux_backlight.o
CC drivers/gpu/drm/i915/display/intel_dp_link_training.o
CC drivers/gpu/drm/i915/display/intel_dsi.o
CC drivers/gpu/drm/i915/display/intel_dp_mst.o
CC drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.o
CC drivers/gpu/drm/i915/display/intel_dsi_vbt.o
CC drivers/gpu/drm/i915/display/intel_gmbus.o
CC drivers/gpu/drm/i915/display/intel_dvo.o
CC drivers/gpu/drm/i915/display/intel_hdmi.o
CC drivers/gpu/drm/i915/display/intel_lspcon.o
AR net/netfilter/built-in.a
CC drivers/gpu/drm/i915/display/intel_lvds.o
AR net/built-in.a
CC drivers/gpu/drm/i915/display/intel_panel.o
CC drivers/gpu/drm/i915/display/intel_sdvo.o
CC drivers/gpu/drm/i915/display/intel_tv.o
CC drivers/gpu/drm/i915/display/intel_vdsc.o
CC drivers/gpu/drm/i915/display/vlv_dsi.o
CC drivers/gpu/drm/i915/display/vlv_dsi_pll.o
CC drivers/gpu/drm/i915/oa/i915_oa_hsw.o
CC drivers/gpu/drm/i915/oa/i915_oa_bdw.o
CC drivers/gpu/drm/i915/oa/i915_oa_chv.o
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt2.o
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt3.o
CC drivers/gpu/drm/i915/oa/i915_oa_sklgt4.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/gpu/drm/i915/oa/i915_oa_glk.o
CC drivers/gpu/drm/i915/oa/i915_oa_cflgt2.o
CC drivers/gpu/drm/i915/oa/i915_oa_cflgt3.o
CC drivers/gpu/drm/i915/oa/i915_oa_icl.o
CC drivers/gpu/drm/i915/oa/i915_oa_cnl.o
CC drivers/gpu/drm/i915/oa/i915_oa_tgl.o
AR fs/btrfs/built-in.a
CC drivers/gpu/drm/i915/i915_gpu_error.o
CC drivers/gpu/drm/i915/i915_perf.o
CC drivers/gpu/drm/i915/i915_vgpu.o
AR fs/xfs/built-in.a
AR fs/built-in.a
AR drivers/gpu/drm/i915/built-in.a
AR drivers/gpu/drm/built-in.a
AR drivers/gpu/built-in.a
Makefile:1681: recipe for target 'drivers' failed
make: *** [drivers] Error 2


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=148c5f29e00000


Tested on:

commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git
dashboard link: https://syzkaller.appspot.com/bug?extid=cd66e43794b178bb5cd6
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
patch: https://syzkaller.appspot.com/x/patch.diff?x=1336c0a9e00000

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  Last update: 2020-03-08 19:00    [W:0.125 / U:1.340 seconds]
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