Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
From: syzbot
Date: Tue Jun 11 2024 - 08:31:58 EST
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
tack depth: 8144 bytes left
[ 55.419101][ T4450] EXT4-fs (sda1): re-mounted 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 r/w. Quota mode: none.
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[ 55.779289][ T4453] mount (4453) used greatest stack depth: 5568 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [ 59.585501][ T4483] udevd[4483]: starting version 3.2.11
[ 63.130230][ T4484] udevd[4484]: starting eudev-3.2.11
[ 63.142629][ T4483] udevd (4483) used greatest stack depth: 5376 bytes left
[ 96.265218][ T1224] net_ratelimit: 2 callbacks suppressed
[ 96.265294][ T1224] aoe: packet could not be sent on lo. consider increasing tx_queue_len
[ 96.280260][ T1224] aoe: packet could not be sent on bond0. consider increasing tx_queue_len
[ 96.289350][ T1224] aoe: packet could not be sent on dummy0. consider increasing tx_queue_len
[ 96.298544][ T1224] aoe: packet could not be sent on eql. consider increasing tx_queue_len
[ 96.307476][ T1224] aoe: packet could not be sent on ifb0. consider increasing tx_queue_len
[ 96.316489][ T1224] aoe: packet could not be sent on ifb1. consider increasing tx_queue_len
[ 96.325548][ T1224] aoe: packet could not be sent on eth0. consider increasing tx_queue_len
[ 96.334622][ T1224] aoe: packet could not be sent on wlan0. consider increasing tx_queue_len
[ 96.343626][ T1224] aoe: packet could not be sent on wlan1. consider increasing tx_queue_len
[ 96.352793][ T1224] aoe: packet could not be sent on hwsim0. consider increasing tx_queue_len
done
Starting system message bus: done
Starting iptables: OK
Starting network: OK
Starting dhcpcd...
dhcpcd-9.4.1 starting
dev: loaded udev
DUID 00:04:98:24:4c:28:99:7c:d9:70:fe:51:ca:fe:56:33:2c:7d
forked to background, child pid 4696
[ 111.030473][ T4697] 8021q: adding VLAN 0 to HW filter on device bond0
[ 111.100696][ T4697] eql: remember to turn off Van-Jacobson compression on your slave devices
[ 111.616746][ T10] cfg80211: failed to load regulatory.db
Starting sshd: [ 113.281387][ T4783] sshd (4783) used greatest stack depth: 4392 bytes left
OK
syzkaller
syzkaller login: [ 114.141307][ C0] =====================================================
[ 114.148674][ C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[ 114.155836][ C0] receive_buf+0x25e3/0x5fd0
[ 114.160622][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.165429][ C0] __napi_poll+0xe7/0x980
[ 114.170059][ C0] net_rx_action+0x82a/0x1850
[ 114.174955][ C0] handle_softirqs+0x1ce/0x800
[ 114.179889][ C0] __irq_exit_rcu+0x68/0x120
[ 114.184692][ C0] irq_exit_rcu+0x12/0x20
[ 114.189250][ C0] common_interrupt+0x94/0xa0
[ 114.194165][ C0] asm_common_interrupt+0x2b/0x40
[ 114.199461][ C0] virt_to_page_or_null+0xf0/0x150
[ 114.204769][ C0] kmsan_get_metadata+0x146/0x1d0
[ 114.209965][ C0] kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.215799][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.221887][ C0] is_last_task_frame+0x62/0x420
[ 114.227000][ C0] unwind_next_frame+0x9d/0x470
[ 114.231997][ C0] arch_stack_walk+0x1ec/0x2d0
[ 114.237029][ C0] stack_trace_save+0xaa/0xe0
[ 114.241881][ C0] kmsan_internal_chain_origin+0x57/0xd0
[ 114.247698][ C0] kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.254063][ C0] __msan_memcpy+0x108/0x1c0
[ 114.258744][ C0] sock_write_iter+0x38e/0x3d0
[ 114.263898][ C0] vfs_write+0xb38/0x1550
[ 114.268406][ C0] ksys_write+0x20f/0x4c0
[ 114.272940][ C0] __x64_sys_write+0x93/0xe0
[ 114.277742][ C0] x64_sys_call+0x3093/0x3b90
[ 114.283323][ C0] do_syscall_64+0xcd/0x1e0
[ 114.288178][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.294332][ C0]
[ 114.296980][ C0] Uninit was created at:
[ 114.301397][ C0] __alloc_pages_noprof+0x9d6/0xe70
[ 114.306908][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 114.312874][ C0] alloc_pages_noprof+0x1bf/0x1e0
[ 114.318109][ C0] skb_page_frag_refill+0x2bf/0x7c0
[ 114.323487][ C0] virtnet_rq_alloc+0x43/0xbb0
[ 114.328434][ C0] try_fill_recv+0x3f0/0x2f50
[ 114.333556][ C0] virtnet_open+0x1cc/0xb00
[ 114.338238][ C0] __dev_open+0x546/0x6f0
[ 114.342858][ C0] __dev_change_flags+0x309/0x9a0
[ 114.348074][ C0] dev_change_flags+0x8e/0x1d0
[ 114.353097][ C0] devinet_ioctl+0x13ec/0x22c0
[ 114.358127][ C0] inet_ioctl+0x4bd/0x6d0
[ 114.362784][ C0] sock_do_ioctl+0xb7/0x540
[ 114.367599][ C0] sock_ioctl+0x727/0xd70
[ 114.372193][ C0] __se_sys_ioctl+0x261/0x450
[ 114.377188][ C0] __x64_sys_ioctl+0x96/0xe0
[ 114.382012][ C0] x64_sys_call+0x18c0/0x3b90
[ 114.387389][ C0] do_syscall_64+0xcd/0x1e0
[ 114.392122][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.398360][ C0]
[ 114.400882][ C0] CPU: 0 PID: 4697 Comm: dhcpcd Not tainted 6.10.0-rc3-syzkaller-00001-g956a9878a570 #0
[ 114.410797][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.421038][ C0] =====================================================
[ 114.428277][ C0] Disabling lock debugging due to kernel taint
[ 114.434617][ C0] Kernel panic - not syncing: kmsan.panic set ...
[ 114.441168][ C0] CPU: 0 PID: 4697 Comm: dhcpcd Tainted: G B 6.10.0-rc3-syzkaller-00001-g956a9878a570 #0
[ 114.452775][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.462940][ C0] Call Trace:
[ 114.466456][ C0] <IRQ>
[ 114.469372][ C0] dump_stack_lvl+0x216/0x2d0
[ 114.474259][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.480223][ C0] dump_stack+0x1e/0x30
[ 114.484499][ C0] panic+0x4e2/0xcd0
[ 114.488493][ C0] ? kmsan_get_metadata+0x51/0x1d0
[ 114.493722][ C0] kmsan_report+0x2d5/0x2e0
[ 114.498385][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.504323][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.509625][ C0] ? __msan_warning+0x95/0x120
[ 114.514761][ C0] ? receive_buf+0x25e3/0x5fd0
[ 114.519656][ C0] ? virtnet_poll+0xd1c/0x23c0
[ 114.524559][ C0] ? __napi_poll+0xe7/0x980
[ 114.529199][ C0] ? net_rx_action+0x82a/0x1850
[ 114.534316][ C0] ? handle_softirqs+0x1ce/0x800
[ 114.539583][ C0] ? __irq_exit_rcu+0x68/0x120
[ 114.544544][ C0] ? irq_exit_rcu+0x12/0x20
[ 114.549164][ C0] ? common_interrupt+0x94/0xa0
[ 114.554156][ C0] ? asm_common_interrupt+0x2b/0x40
[ 114.559485][ C0] ? virt_to_page_or_null+0xf0/0x150
[ 114.564878][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.570183][ C0] ? kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.576101][ C0] ? __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.582270][ C0] ? is_last_task_frame+0x62/0x420
[ 114.587529][ C0] ? unwind_next_frame+0x9d/0x470
[ 114.592633][ C0] ? arch_stack_walk+0x1ec/0x2d0
[ 114.597935][ C0] ? stack_trace_save+0xaa/0xe0
[ 114.602932][ C0] ? kmsan_internal_chain_origin+0x57/0xd0
[ 114.609058][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.615513][ C0] ? __msan_memcpy+0x108/0x1c0
[ 114.620375][ C0] ? sock_write_iter+0x38e/0x3d0
[ 114.625423][ C0] ? vfs_write+0xb38/0x1550
[ 114.630144][ C0] ? ksys_write+0x20f/0x4c0
[ 114.634752][ C0] ? __x64_sys_write+0x93/0xe0
[ 114.639611][ C0] ? x64_sys_call+0x3093/0x3b90
[ 114.644574][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.649357][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.655580][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.661089][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.666460][ C0] ? page_to_skb+0xdae/0x1620
[ 114.671465][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.676893][ C0] __msan_warning+0x95/0x120
[ 114.681587][ C0] receive_buf+0x25e3/0x5fd0
[ 114.686629][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.692034][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.697966][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.702687][ C0] ? __pfx_virtnet_poll+0x10/0x10
[ 114.707811][ C0] __napi_poll+0xe7/0x980
[ 114.712253][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.717564][ C0] net_rx_action+0x82a/0x1850
[ 114.722441][ C0] ? sched_clock_cpu+0x55/0x870
[ 114.727421][ C0] ? __pfx_net_rx_action+0x10/0x10
[ 114.732628][ C0] handle_softirqs+0x1ce/0x800
[ 114.737611][ C0] __irq_exit_rcu+0x68/0x120
[ 114.742301][ C0] irq_exit_rcu+0x12/0x20
[ 114.746720][ C0] common_interrupt+0x94/0xa0
[ 114.751524][ C0] </IRQ>
[ 114.754533][ C0] <TASK>
[ 114.757619][ C0] asm_common_interrupt+0x2b/0x40
[ 114.762781][ C0] RIP: 0010:virt_to_page_or_null+0xf0/0x150
[ 114.768821][ C0] Code: f6 c0 08 75 15 48 c1 ea 15 48 8b 76 08 83 e2 3f 31 c9 48 0f a3 56 10 0f 92 c1 65 ff 0d 11 43 c5 7d 74 4d 65 ff 0d 08 43 c5 7d <85> c9 0f 84 3b ff ff ff 48 81 ff 00 00 00 80 72 09 48 8b 0d 78 74
[ 114.788641][ C0] RSP: 0018:ffff8881160076b0 EFLAGS: 00000286
[ 114.794817][ C0] RAX: ffff888194a30020 RBX: ffff888114a30020 RCX: 0000000000000001
[ 114.802961][ C0] RDX: 0000000114a30020 RSI: ffff88813fff9220 RDI: ffff888114a30020
[ 114.811014][ C0] RBP: ffff8881160076b0 R08: ffffea000000000f R09: ffff888116004000
[ 114.819084][ C0] R10: ffff888116007818 R11: ffffffff81935550 R12: 0000000000000000
[ 114.827135][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888114a30020
[ 114.835190][ C0] ? __pfx_stack_trace_consume_entry+0x10/0x10
[ 114.841475][ C0] kmsan_get_metadata+0x146/0x1d0
[ 114.846629][ C0] kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.852370][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.858386][ C0] is_last_task_frame+0x62/0x420
[ 114.863429][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.869401][ C0] unwind_next_frame+0x9d/0x470
[ 114.874444][ C0] arch_stack_walk+0x1ec/0x2d0
[ 114.879348][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.884168][ C0] ? __pfx_stack_trace_consume_entry+0x10/0x10
[ 114.890569][ C0] stack_trace_save+0xaa/0xe0
[ 114.895448][ C0] kmsan_internal_chain_origin+0x57/0xd0
[ 114.901315][ C0] ? kmsan_internal_chain_origin+0x57/0xd0
[ 114.907242][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.913797][ C0] ? __msan_memcpy+0x108/0x1c0
[ 114.918732][ C0] ? sock_write_iter+0x38e/0x3d0
[ 114.923798][ C0] ? vfs_write+0xb38/0x1550
[ 114.928458][ C0] ? ksys_write+0x20f/0x4c0
[ 114.933071][ C0] ? __x64_sys_write+0x93/0xe0
[ 114.937962][ C0] ? x64_sys_call+0x3093/0x3b90
[ 114.943128][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.947923][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.953292][ C0] ? kmsan_internal_set_shadow_origin+0x69/0x100
[ 114.959771][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.965109][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.970431][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.976472][ C0] ? unix_dgram_sendmsg+0xd93/0x2ce0
[ 114.981868][ C0] ? aa_sk_perm+0x881/0xd90
[ 114.986487][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.991792][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.997731][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 115.003121][ C0] kmsan_internal_memmove_metadata+0x17b/0x230
[ 115.009411][ C0] __msan_memcpy+0x108/0x1c0
[ 115.014216][ C0] sock_write_iter+0x38e/0x3d0
[ 115.019109][ C0] vfs_write+0xb38/0x1550
[ 115.023542][ C0] ? __pfx_sock_write_iter+0x10/0x10
[ 115.029014][ C0] ksys_write+0x20f/0x4c0
[ 115.033533][ C0] __x64_sys_write+0x93/0xe0
[ 115.038236][ C0] x64_sys_call+0x3093/0x3b90
[ 115.043164][ C0] do_syscall_64+0xcd/0x1e0
[ 115.047796][ C0] ? clear_bhb_loop+0x25/0x80
[ 115.052625][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 115.058663][ C0] RIP: 0033:0x7f96e0e10bf2
[ 115.063173][ C0] Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
[ 115.082994][ C0] RSP: 002b:00007fffc25d6c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 115.091610][ C0] RAX: ffffffffffffffda RBX: 00007f96e0eec4c0 RCX: 00007f96e0e10bf2
[ 115.099666][ C0] RDX: 0000000000000020 RSI: 00005598f18db020 RDI: 0000000000000002
[ 115.108056][ C0] RBP: 0000000000000020 R08: 0000000000000000 R09: 0000000000000000
[ 115.116367][ C0] R10: 00007fffc25d7a50 R11: 0000000000000246 R12: 0000000000000020
[ 115.124456][ C0] R13: 00005598f18db020 R14: 0000000000000000 R15: 0000000000000000
[ 115.132580][ C0] </TASK>
[ 115.136102][ C0] Kernel Offset: disabled
[ 115.140501][ C0] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3221393454=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at c8349e4853
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"c8349e48534ea6d8f01515335d95de8ebf5da8df\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1344182e980000
Tested on:
commit: 956a9878 kernel/bpf: KMSAN: uninit-value in htab_lru_p..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
kernel config: https://syzkaller.appspot.com/x/.config?x=3486f1660f47f855
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.