[syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup_elem

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 5e74df2f8f15 Merge tag 'x86-urgent-2024-03-24' of git://gi..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=148872a5180000
kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a
dashboard link: https://syzkaller.appspot.com/bug?extid=1a3cf6f08d68868f9db3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15921a6e180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e081f1180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1a82880723a7/disk-5e74df2f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd3046ac43b9/vmlinux-5e74df2f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2097be59cbc1/bzImage-5e74df2f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1a3cf6...@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]
BUG: KMSAN: uninit-value in dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796
__dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]
dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796
____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline]
bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38
___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
__bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run5+0x16f/0x350 kernel/trace/bpf_trace.c:2423
__bpf_trace_ext4_remove_blocks+0x45/0x60 include/trace/events/ext4.h:1984
__traceiter_ext4_remove_blocks+0xb5/0x170 include/trace/events/ext4.h:1984
trace_ext4_remove_blocks include/trace/events/ext4.h:1984 [inline]
ext4_remove_blocks fs/ext4/extents.c:2463 [inline]
ext4_ext_rm_leaf fs/ext4/extents.c:2686 [inline]
ext4_ext_remove_space+0x4e30/0x7e00 fs/ext4/extents.c:2934
ext4_ext_truncate+0x1e3/0x390 fs/ext4/extents.c:4440
ext4_truncate+0x14c6/0x1e10 fs/ext4/inode.c:4146
ext4_evict_inode+0x1886/0x24d0 fs/ext4/inode.c:258
evict+0x3ae/0xa60 fs/inode.c:667
iput_final fs/inode.c:1741 [inline]
iput+0x9ca/0xe10 fs/inode.c:1767
d_delete_notify include/linux/fsnotify.h:307 [inline]
vfs_rmdir+0x53c/0x790 fs/namei.c:4222
do_rmdir+0x630/0x8b0 fs/namei.c:4268
__do_sys_rmdir fs/namei.c:4287 [inline]
__se_sys_rmdir fs/namei.c:4285 [inline]
__x64_sys_rmdir+0x78/0xb0 fs/namei.c:4285
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75

Local variable stack created at:
__bpf_prog_run256+0x45/0xe0 kernel/bpf/core.c:2237
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run5+0x16f/0x350 kernel/trace/bpf_trace.c:2423

CPU: 0 PID: 5017 Comm: syz-executor365 Not tainted 6.8.0-syzkaller-13236-g5e74df2f8f15 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
=====================================================


---
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[Martin KaFai Lau]

It should be in the interpreter mode.

The C reproducer is trying to run the following bpf prog:

0: (18) r0 = 0x0
2: (18) r1 = map[id:49]
4: (b7) r8 = 16777216
5: (7b) *(u64 *)(r10 -8) = r8
6: (bf) r2 = r10
7: (07) r2 += -229
^^^^^^^^^^

8: (b7) r3 = 8
9: (b7) r4 = 0
10: (85) call dev_map_lookup_elem#1543472
11: (95) exit

I think this KMSAN report (and a few others related to lookup/delete_elem)
should only happen in the interpreter mode.

Does it worth to suppress it by always initializing the stack in the interpreter
mode considering the interpreter is not very speed sensitive ?

[Alexei Starovoitov]

Maybe we can mark it as initialized from kmsan pov ?
There are kasan_poison/unpoison helpers that may fit ?

[Yonghong Song]

Maybe use kmsan_unpoison_memory()?

In lib/Kconfig.kmsan, we have

config KMSAN
bool "KMSAN: detector of uninitialized values use"
depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER
depends on DEBUG_KERNEL && !KASAN && !KCSAN
depends on !PREEMPT_RT
select STACKDEPOT
select STACKDEPOT_ALWAYS_INIT
help
KernelMemorySanitizer (KMSAN) is a dynamic detector of uses of
uninitialized values in the kernel. It is based on compiler
instrumentation provided by Clang and thus requires Clang to build.

An important note is that KMSAN is not intended for production use,
because it drastically increases kernel memory footprint and slows
the whole system down.

See <file:Documentation/dev-tools/kmsan.rst> for more details.

So enable KMSAN, KASAN and KCSAN needs to be disabled.

[Martin KaFai Lau]

Good idea. It should do. My qemu cannot boot with CONFIG_KMSAN somehow.
I will ask syzbot to test.

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/martin.lau/bpf-next.git interpreter.kmsan

[Martin KaFai Lau]

On 3/25/24 2:36 AM, syzbot wrote:

[Martin KaFai Lau]

On 3/25/24 2:36 AM, syzbot wrote:

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/martin.lau/bpf-next.git d8889e866be3

[syzbot]

Hello,

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

.o
CC fs/aio.o
CC drivers/hid/hid-gt683r.o
CC drivers/hid/hid-gyration.o
CC drivers/hid/hid-holtek-kbd.o
CC drivers/platform/x86/p2sb.o
CC drivers/iio/buffer/industrialio-triggered-buffer.o
CC drivers/staging/rtl8712/rtl871x_ioctl_set.o
CC drivers/staging/rtl8712/rtl8712_led.o
AR drivers/mailbox/built-in.a
CC fs/btrfs/uuid-tree.o
CC fs/xfs/xfs_dquot.o
CC fs/dax.o
AR drivers/iio/accel/built-in.a
AR drivers/iio/cdc/built-in.a
CC fs/locks.o
CC drivers/iio/adc/viperboard_adc.o
CC drivers/gpu/drm/i915/display/intel_plane_initial.o
CC fs/binfmt_misc.o
CC fs/binfmt_script.o
CC net/netfilter/xt_length.o
CC drivers/hid/hid-holtek-mouse.o
AR drivers/iio/chemical/built-in.a
CC fs/xfs/xfs_dquot_item.o
AR drivers/iio/common/cros_ec_sensors/built-in.a
CC drivers/iio/common/hid-sensors/hid-sensor-attributes.o
CC drivers/extcon/devres.o
CC fs/bcachefs/opts.o
CC drivers/iio/common/hid-sensors/hid-sensor-trigger.o
CC fs/binfmt_elf.o
AR drivers/media/usb/pvrusb2/built-in.a
CC fs/xfs/xfs_trans_dquot.o
AR drivers/iio/common/inv_sensors/built-in.a
CC fs/xfs/xfs_qm_syscalls.o
CC fs/xfs/xfs_qm_bhv.o
CC drivers/staging/rtl8712/rtl871x_mlme.o
AR drivers/iio/dac/built-in.a
CC drivers/hid/hid-holtekff.o
CC drivers/hid/hid-icade.o
CC drivers/iio/buffer/kfifo_buf.o
AR drivers/iio/common/ms_sensors/built-in.a
CC net/netfilter/xt_limit.o
CC net/netfilter/xt_mac.o
AR drivers/iio/common/scmi_sensors/built-in.a
CC drivers/thunderbolt/nhi.o
AR drivers/hwtracing/intel_th/built-in.a
AR drivers/iio/adc/built-in.a
CC net/netfilter/xt_multiport.o
AR drivers/iio/common/ssp_sensors/built-in.a
CC drivers/gpu/drm/i915/display/intel_pmdemand.o
AR drivers/iio/dummy/built-in.a
CC drivers/thunderbolt/nhi_ops.o
CC fs/btrfs/props.o
AR drivers/iio/common/st_sensors/built-in.a
CC net/netfilter/xt_nfacct.o
CC fs/xfs/xfs_qm.o
CC net/netfilter/xt_osf.o
AR drivers/platform/x86/built-in.a
CC fs/xfs/xfs_quotaops.o
AR drivers/platform/built-in.a
CC fs/xfs/xfs_rtalloc.o
CC drivers/android/binderfs.o
CC drivers/iio/gyro/hid-sensor-gyro-3d.o
CC drivers/extcon/extcon-intel-cht-wc.o
CC fs/compat_binfmt_elf.o
CC fs/xfs/xfs_acl.o
CC drivers/thunderbolt/ctl.o
CC drivers/thunderbolt/tb.o
CC fs/btrfs/free-space-tree.o
CC fs/btrfs/tree-checker.o
CC fs/xfs/xfs_sysctl.o
CC drivers/hid/hid-ite.o
CC drivers/staging/rtl8712/ieee80211.o
CC drivers/staging/rtl8712/rtl871x_mp_ioctl.o
CC drivers/staging/rtl8712/rtl871x_mp.o
CC fs/btrfs/space-info.o
CC drivers/thunderbolt/switch.o
CC net/netfilter/xt_owner.o
CC drivers/hid/hid-kensington.o
AR drivers/nvmem/layouts/built-in.a
CC drivers/nvmem/core.o
CC drivers/staging/rtl8712/mlme_linux.o
CC fs/backing-file.o
CC drivers/staging/rtl8712/recv_linux.o
CC drivers/staging/rtl8712/xmit_linux.o
CC drivers/thunderbolt/cap.o
CC fs/bcachefs/printbuf.o
AR drivers/ras/built-in.a
CC fs/mbcache.o
AR drivers/iio/filter/built-in.a
CC drivers/counter/counter-core.o
AR drivers/iio/buffer/built-in.a
CC fs/posix_acl.o
CC drivers/staging/rtl8712/usb_intf.o
CC fs/coredump.o
AR drivers/iio/frequency/built-in.a
AR drivers/iio/health/built-in.a
CC drivers/most/core.o
AR drivers/extcon/built-in.a
CC drivers/counter/counter-sysfs.o
CC drivers/counter/counter-chrdev.o
CC net/netfilter/xt_cgroup.o
AR drivers/iio/gyro/built-in.a
AR drivers/iio/common/hid-sensors/built-in.a
CC fs/drop_caches.o
AR drivers/iio/common/built-in.a
CC drivers/iio/humidity/hid-sensor-humidity.o
CC fs/sysctls.o
CC drivers/hid/hid-keytouch.o
CC fs/xfs/xfs_ioctl32.o
CC drivers/thunderbolt/path.o
CC drivers/thunderbolt/tunnel.o
AR fs/ocfs2/built-in.a
CC drivers/thunderbolt/eeprom.o
CC net/netfilter/xt_physdev.o
CC fs/fhandle.o
CC drivers/android/binder.o
CC drivers/staging/rtl8712/os_intfs.o
CC fs/btrfs/block-rsv.o
CC drivers/android/binder_alloc.o
CC drivers/hid/hid-kye.o
CC drivers/most/configfs.o
AR drivers/iio/imu/bmi160/built-in.a
AR drivers/iio/imu/bmi323/built-in.a
AR drivers/iio/imu/bno055/built-in.a
CC fs/bcachefs/quota.o
CC drivers/iio/light/hid-sensor-als.o
CC drivers/iio/light/hid-sensor-prox.o
AR drivers/iio/imu/inv_icm42600/built-in.a
AR drivers/iio/imu/inv_mpu6050/built-in.a
CC fs/btrfs/delalloc-space.o
AR drivers/iio/imu/st_lsm6dsx/built-in.a
CC fs/btrfs/block-group.o
AR drivers/iio/imu/st_lsm9ds0/built-in.a
CC fs/btrfs/discard.o
AR drivers/iio/imu/built-in.a
CC fs/btrfs/reflink.o
CC drivers/staging/rtl8712/rtl871x_pwrctrl.o
CC fs/bcachefs/rebalance.o
CC drivers/iio/magnetometer/hid-sensor-magn-3d.o
CC fs/btrfs/subpage.o
CC drivers/thunderbolt/domain.o
CC fs/btrfs/tree-mod-log.o
CC net/netfilter/xt_pkttype.o
CC fs/btrfs/extent-io-tree.o
AR drivers/iio/multiplexer/built-in.a
CC drivers/iio/orientation/hid-sensor-incl-3d.o
CC drivers/gpu/drm/i915/display/intel_psr.o
AR drivers/media/usb/gspca/built-in.a
AR drivers/iio/position/built-in.a
CC drivers/iio/orientation/hid-sensor-rotation.o
AR drivers/media/usb/built-in.a
CC net/netfilter/xt_policy.o
CC net/netfilter/xt_quota.o
AR drivers/iio/potentiometer/built-in.a
CC drivers/nvmem/layouts.o
CC drivers/staging/rtl8712/rtl8712_recv.o
AR drivers/media/built-in.a
CC fs/bcachefs/recovery.o
CC fs/xfs/xfs_pnfs.o
CC drivers/gpu/drm/i915/display/intel_quirks.o
CC fs/btrfs/fs.o
AR drivers/iio/potentiostat/built-in.a
CC drivers/hid/hid-lcpower.o
CC drivers/hid/hid-lenovo.o
CC drivers/hid/hid-lg.o
CC drivers/hid/hid-lgff.o
AR drivers/iio/humidity/built-in.a
CC net/netfilter/xt_rateest.o
AR drivers/iio/resolver/built-in.a
AR drivers/iio/proximity/built-in.a
CC drivers/gpu/drm/i915/display/intel_sprite.o
CC drivers/iio/pressure/hid-sensor-press.o
CC drivers/iio/temperature/hid-sensor-temperature.o
CC drivers/gpu/drm/i915/display/intel_sprite_uapi.o
CC fs/btrfs/messages.o
CC drivers/gpu/drm/i915/display/intel_tc.o
AR drivers/counter/built-in.a
CC drivers/gpu/drm/i915/display/intel_vblank.o
CC drivers/gpu/drm/i915/display/intel_vga.o
CC drivers/hid/hid-lg2ff.o
CC drivers/thunderbolt/dma_port.o
CC fs/btrfs/bio.o
AR drivers/iio/light/built-in.a
AR drivers/iio/test/built-in.a
AR drivers/iio/trigger/built-in.a
CC drivers/thunderbolt/icm.o
CC net/netfilter/xt_realm.o
CC net/netfilter/xt_recent.o
CC net/netfilter/xt_sctp.o
CC drivers/thunderbolt/property.o
AR drivers/iio/magnetometer/built-in.a
CC drivers/hid/hid-lg3ff.o
AR drivers/most/built-in.a
CC drivers/thunderbolt/xdomain.o
CC drivers/hid/hid-lg4ff.o
CC net/netfilter/xt_socket.o
CC drivers/thunderbolt/lc.o
CC net/netfilter/xt_state.o
CC drivers/hid/hid-lg-g15.o
CC fs/btrfs/lru_cache.o
CC drivers/staging/rtl8712/rtl871x_recv.o
CC drivers/iio/industrialio-core.o
CC drivers/gpu/drm/i915/display/intel_wm.o
AR drivers/iio/orientation/built-in.a
CC net/netfilter/xt_statistic.o
CC drivers/iio/industrialio-event.o
CC drivers/iio/inkern.o
CC net/netfilter/xt_string.o
CC fs/btrfs/raid-stripe-tree.o
CC net/netfilter/xt_tcpmss.o
CC net/netfilter/xt_time.o
CC drivers/iio/industrialio-buffer.o
CC drivers/hid/hid-logitech-dj.o
CC drivers/gpu/drm/i915/display/skl_scaler.o
AR drivers/nvmem/built-in.a
CC drivers/iio/industrialio-trigger.o
CC drivers/gpu/drm/i915/display/skl_universal_plane.o
CC drivers/thunderbolt/tmu.o
AR drivers/iio/temperature/built-in.a
CC fs/btrfs/acl.o
CC drivers/hid/hid-logitech-hidpp.o
CC drivers/hid/hid-magicmouse.o
AR drivers/iio/pressure/built-in.a
CC drivers/thunderbolt/usb4.o
CC drivers/thunderbolt/usb4_port.o
CC drivers/staging/rtl8712/rtl871x_sta_mgt.o
CC drivers/gpu/drm/i915/display/skl_watermark.o
CC drivers/hid/hid-mf.o
CC net/netfilter/xt_u32.o
CC fs/bcachefs/reflink.o
CC drivers/staging/rtl8712/rtl871x_xmit.o
CC fs/btrfs/ref-verify.o
CC drivers/thunderbolt/nvm.o
CC net/netfilter/nf_hooks_lwtunnel.o
CC drivers/staging/rtl8712/rtl8712_xmit.o
CC fs/bcachefs/sb-clean.o
CC drivers/hid/hid-microsoft.o
CC fs/bcachefs/replicas.o
CC fs/btrfs/zoned.o
CC drivers/gpu/drm/i915/display/intel_acpi.o
CC fs/bcachefs/sb-counters.o
CC drivers/hid/hid-monterey.o
CC drivers/gpu/drm/i915/display/intel_opregion.o
CC fs/btrfs/verity.o
CC fs/bcachefs/sb-downgrade.o
CC fs/bcachefs/sb-errors.o
CC fs/bcachefs/sb-members.o
CC fs/bcachefs/siphash.o
CC drivers/hid/hid-multitouch.o
CC drivers/hid/hid-nti.o
CC drivers/hid/hid-ntrig.o
CC drivers/gpu/drm/i915/display/intel_fbdev.o
CC drivers/thunderbolt/retimer.o
CC fs/bcachefs/six.o
CC fs/bcachefs/snapshot.o
CC drivers/thunderbolt/quirks.o
CC drivers/thunderbolt/clx.o
CC drivers/thunderbolt/acpi.o
CC drivers/hid/hid-ortek.o
CC drivers/hid/hid-prodikeys.o
CC drivers/hid/hid-pl.o
CC drivers/gpu/drm/i915/display/intel_fbdev_fb.o
CC drivers/hid/hid-penmount.o
CC drivers/thunderbolt/debugfs.o
CC drivers/hid/hid-petalynx.o
CC drivers/hid/hid-picolcd_core.o
CC drivers/hid/hid-picolcd_fb.o
CC drivers/hid/hid-picolcd_backlight.o
CC drivers/hid/hid-picolcd_lcd.o
CC drivers/gpu/drm/i915/display/intel_display_debugfs.o
CC drivers/gpu/drm/i915/display/intel_display_debugfs_params.o
CC drivers/hid/hid-picolcd_leds.o
CC drivers/gpu/drm/i915/display/intel_pipe_crc.o
CC drivers/hid/hid-picolcd_cir.o
CC drivers/gpu/drm/i915/display/dvo_ch7017.o
CC drivers/gpu/drm/i915/display/dvo_ch7xxx.o
CC drivers/hid/hid-picolcd_debugfs.o
CC drivers/gpu/drm/i915/display/dvo_ivch.o
CC fs/bcachefs/subvolume.o
CC fs/bcachefs/super.o
CC fs/bcachefs/super-io.o
CC fs/bcachefs/sysfs.o
CC drivers/hid/hid-plantronics.o
CC fs/bcachefs/tests.o
CC fs/bcachefs/time_stats.o
CC fs/bcachefs/thread_with_file.o
CC drivers/hid/hid-primax.o
CC fs/bcachefs/trace.o
CC drivers/hid/hid-redragon.o
CC drivers/hid/hid-retrode.o
CC drivers/hid/hid-roccat.o
CC drivers/hid/hid-roccat-common.o
CC fs/bcachefs/two_state_shared_lock.o
CC drivers/hid/hid-roccat-arvo.o
CC fs/bcachefs/util.o
CC fs/bcachefs/varint.o
CC drivers/hid/hid-roccat-isku.o
CC drivers/gpu/drm/i915/display/dvo_ns2501.o
CC drivers/hid/hid-roccat-kone.o
CC fs/bcachefs/xattr.o
CC drivers/hid/hid-roccat-koneplus.o
CC drivers/gpu/drm/i915/display/dvo_sil164.o
CC drivers/hid/hid-roccat-konepure.o
CC drivers/hid/hid-roccat-kovaplus.o
CC drivers/gpu/drm/i915/display/dvo_tfp410.o
CC drivers/gpu/drm/i915/display/g4x_dp.o
AR drivers/iio/built-in.a
AR drivers/staging/rtl8712/built-in.a
CC drivers/hid/hid-roccat-lua.o
CC drivers/gpu/drm/i915/display/g4x_hdmi.o
AR drivers/staging/built-in.a
CC drivers/hid/hid-roccat-pyra.o
CC drivers/hid/hid-roccat-ryos.o
CC drivers/hid/hid-roccat-savu.o
AR net/netfilter/built-in.a
CC drivers/hid/hid-rmi.o
CC drivers/gpu/drm/i915/display/icl_dsi.o
CC drivers/hid/hid-saitek.o
AR fs/xfs/built-in.a
CC drivers/hid/hid-samsung.o
AR net/built-in.a
CC drivers/hid/hid-sjoy.o
CC drivers/hid/hid-sony.o
CC drivers/hid/hid-speedlink.o
CC drivers/hid/hid-steelseries.o
CC drivers/gpu/drm/i915/display/intel_backlight.o
CC drivers/hid/hid-sunplus.o
CC drivers/gpu/drm/i915/display/intel_crt.o
CC drivers/gpu/drm/i915/display/intel_cx0_phy.o
CC drivers/hid/hid-gaff.o
CC drivers/hid/hid-tmff.o
CC drivers/hid/hid-thrustmaster.o
CC drivers/gpu/drm/i915/display/intel_ddi.o
CC drivers/hid/hid-tivo.o
CC drivers/gpu/drm/i915/display/intel_ddi_buf_trans.o
CC drivers/hid/hid-topseed.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
AR drivers/thunderbolt/built-in.a
CC drivers/hid/hid-udraw-ps3.o
CC drivers/hid/hid-led.o
CC drivers/hid/hid-xinmo.o
CC drivers/hid/hid-zpff.o
CC drivers/hid/hid-zydacron.o
CC drivers/hid/wacom_wac.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
CC drivers/hid/hid-sensor-hub.o
CC drivers/gpu/drm/i915/display/intel_display_device.o
CC drivers/hid/hid-sensor-custom.o
CC drivers/gpu/drm/i915/display/intel_display_trace.o
CC drivers/gpu/drm/i915/display/intel_dkl_phy.o
CC drivers/gpu/drm/i915/display/intel_dp.o
CC drivers/gpu/drm/i915/display/intel_dp_aux.o
CC drivers/gpu/drm/i915/display/intel_dp_aux_backlight.o
CC drivers/gpu/drm/i915/display/intel_dp_hdcp.o
CC drivers/gpu/drm/i915/display/intel_dp_link_training.o
CC drivers/gpu/drm/i915/display/intel_dp_mst.o
CC drivers/gpu/drm/i915/display/intel_dsi.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
CC drivers/gpu/drm/i915/display/intel_lvds.o
CC drivers/gpu/drm/i915/display/intel_panel.o
CC drivers/gpu/drm/i915/display/intel_pps.o
CC drivers/gpu/drm/i915/display/intel_qp_tables.o
CC drivers/gpu/drm/i915/display/intel_sdvo.o
CC drivers/gpu/drm/i915/display/intel_snps_phy.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/intel_vrr.o
CC drivers/gpu/drm/i915/display/vlv_dsi_pll.o
CC drivers/gpu/drm/i915/display/intel_dp_tunnel.o
AR fs/btrfs/built-in.a
CC drivers/gpu/drm/i915/i915_perf.o
CC drivers/gpu/drm/i915/pxp/intel_pxp.o
CC drivers/gpu/drm/i915/pxp/intel_pxp_huc.o
CC drivers/gpu/drm/i915/pxp/intel_pxp_tee.o
CC drivers/gpu/drm/i915/i915_gpu_error.o
CC drivers/gpu/drm/i915/i915_vgpu.o
AR drivers/android/built-in.a
AR fs/bcachefs/built-in.a
AR fs/built-in.a
AR drivers/hid/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/built-in.a
AR built-in.a
AR vmlinux.a
LD vmlinux.o
Killed
make[2]: *** [scripts/Makefile.vmlinux_o:62: vmlinux.o] Error 137
make[2]: *** Deleting file 'vmlinux.o'
make[1]: *** [/syzkaller/jobs/linux/kernel/Makefile:1141: vmlinux_o] Error 2
make: *** [Makefile:240: __sub-make] Error 2


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12986595180000


Tested on:

commit: d8889e86 bpf: Mark bpf prog stack with kmsan_unposion_..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/martin.lau/bpf-next.git interpreter.kmsan

kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a
dashboard link: https://syzkaller.appspot.com/bug?extid=1a3cf6f08d68868f9db3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+1a3cf6...@syzkaller.appspotmail.com

Tested on:

commit: d8889e86 bpf: Mark bpf prog stack with kmsan_unposion_..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/martin.lau/bpf-next.git interpreter.kmsan

console output: https://syzkaller.appspot.com/x/log.txt?x=10385eb1180000

kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a
dashboard link: https://syzkaller.appspot.com/bug?extid=1a3cf6f08d68868f9db3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

Note: testing is done by a robot and is best-effort only.

[Martin KaFai Lau]

On 3/28/24 3:01 AM, syzbot wrote:
> Killed
> make[2]: *** [scripts/Makefile.vmlinux_o:62: vmlinux.o] Error 137
> make[2]: *** Deleting file 'vmlinux.o'
> make[1]: *** [/syzkaller/jobs/linux/kernel/Makefile:1141: vmlinux_o] Error 2
> make: *** [Makefile:240: __sub-make] Error 2

My second syzbot test attempt passed the build stage and passed the reproducer
also. https://lore.kernel.org/all/000000000000b7...@google.com/

Not sure what caused the syzbot build error in the first attempt but should be
unrelated to the fix. I will post the patch.

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+1a3cf6...@syzkaller.appspotmail.com

Tested on:

commit: d8889e86 bpf: Mark bpf prog stack with kmsan_unposion_..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/martin.lau/bpf-next.git

console output: https://syzkaller.appspot.com/x/log.txt?x=155ac345180000

kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a
dashboard link: https://syzkaller.appspot.com/bug?extid=1a3cf6f08d68868f9db3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40