Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_req_cqe_overflow (3)
From: syzbot
Date: Thu Jun 13 2024 - 21:53:26 EST
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
: Dummy 1
[ 50.085324][ T1] #1: Loopback 1
[ 50.089179][ T1] #2: Virtual MIDI Card 1
[ 50.099411][ T10] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 50.110715][ T1] md: Waiting for all devices to be available before autodetect
[ 50.110769][ T1] md: If you don't use raid, use raid=noautodetect
[ 50.110836][ T1] md: Autodetecting RAID arrays.
[ 50.110883][ T1] md: autorun ...
[ 50.119809][ T10] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[ 50.125316][ T1] md: ... autorun DONE.
[ 50.234241][ T1] EXT4-fs (sda1): mounted filesystem 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 ro with ordered data mode. Quota mode: none.
[ 50.247976][ T1] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[ 50.325610][ T1] devtmpfs: mounted
[ 50.579226][ T1] Freeing unused kernel image (initmem) memory: 37032K
[ 50.590992][ T1] Write protecting the kernel read-only data: 262144k
[ 50.636998][ T1] Freeing unused kernel image (rodata/data gap) memory: 1808K
[ 52.297749][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 52.307966][ T1] x86/mm: Checking user space page tables
[ 53.810797][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 53.819734][ T1] Failed to set sysctl parameter 'kernel.hung_task_all_cpu_backtrace=1': parameter not found
[ 53.841397][ T1] Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found
[ 53.853295][ T1] Run /sbin/init as init process
[ 55.624426][ T4453] mount (4453) used greatest stack depth: 8144 bytes left
[ 55.700932][ T4454] 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
[ 56.048626][ T4457] mount (4457) used greatest stack depth: 5568 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [ 59.882175][ T4487] udevd[4487]: starting version 3.2.11
[ 63.461760][ T4488] udevd[4488]: starting eudev-3.2.11
[ 63.474018][ T4487] udevd (4487) used greatest stack depth: 5288 bytes left
[ 96.328335][ T1216] net_ratelimit: 2 callbacks suppressed
[ 96.328413][ T1216] aoe: packet could not be sent on lo. consider increasing tx_queue_len
[ 96.343724][ T1216] aoe: packet could not be sent on bond0. consider increasing tx_queue_len
[ 96.352822][ T1216] aoe: packet could not be sent on dummy0. consider increasing tx_queue_len
[ 96.362365][ T1216] aoe: packet could not be sent on eql. consider increasing tx_queue_len
[ 96.371420][ T1216] aoe: packet could not be sent on ifb0. consider increasing tx_queue_len
[ 96.380617][ T1216] aoe: packet could not be sent on ifb1. consider increasing tx_queue_len
[ 96.390232][ T1216] aoe: packet could not be sent on eth0. consider increasing tx_queue_len
[ 96.399307][ T1216] aoe: packet could not be sent on wlan0. consider increasing tx_queue_len
[ 96.408742][ T1216] aoe: packet could not be sent on wlan1. consider increasing tx_queue_len
[ 96.417980][ T1216] 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 4700
[ 111.646112][ T4701] 8021q: adding VLAN 0 to HW filter on device bond0
[ 111.665731][ T4701] eql: remember to turn off Van-Jacobson compression on your slave devices
[ 111.739327][ T10] cfg80211: failed to load regulatory.db
Starting sshd: [ 114.013627][ C0] =====================================================
[ 114.021043][ C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[ 114.028525][ C0] receive_buf+0x25e3/0x5fd0
[ 114.033381][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.038271][ C0] __napi_poll+0xe7/0x980
[ 114.042818][ C0] net_rx_action+0x82a/0x1850
[ 114.047892][ C0] handle_softirqs+0x1ce/0x800
[ 114.052877][ C0] __irq_exit_rcu+0x68/0x120
[ 114.057788][ C0] irq_exit_rcu+0x12/0x20
[ 114.062305][ C0] common_interrupt+0x94/0xa0
[ 114.067214][ C0] asm_common_interrupt+0x2b/0x40
[ 114.072524][ C0] unmap_page_range+0x437/0x8670
[ 114.077770][ C0] unmap_single_vma+0x380/0x490
[ 114.082992][ C0] unmap_vmas+0x34a/0x610
[ 114.087600][ C0] exit_mmap+0x236/0xe60
[ 114.091998][ C0] __mmput+0x147/0x5d0
[ 114.096258][ C0] mmput+0x8a/0xa0
[ 114.100278][ C0] exec_mmap+0x80a/0x9b0
[ 114.104689][ C0] begin_new_exec+0x1ac4/0x2bd0
[ 114.109838][ C0] load_elf_binary+0x1412/0x4e10
[ 114.114974][ C0] bprm_execve+0xc57/0x21c0
[ 114.119763][ C0] do_execveat_common+0xceb/0xd70
[ 114.124999][ C0] __x64_sys_execve+0xf4/0x130
[ 114.130048][ C0] x64_sys_call+0x164f/0x3b90
[ 114.135028][ C0] do_syscall_64+0xcd/0x1e0
[ 114.139822][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.145930][ C0]
[ 114.148491][ C0] Uninit was created at:
[ 114.152960][ C0] __alloc_pages_noprof+0x9d6/0xe70
[ 114.158456][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 114.164147][ C0] alloc_pages_noprof+0x1bf/0x1e0
[ 114.169493][ C0] skb_page_frag_refill+0x2bf/0x7c0
[ 114.175099][ C0] virtnet_rq_alloc+0x43/0xbb0
[ 114.180136][ C0] try_fill_recv+0x3f0/0x2f50
[ 114.184984][ C0] virtnet_open+0x1cc/0xb00
[ 114.189780][ C0] __dev_open+0x546/0x6f0
[ 114.194331][ C0] __dev_change_flags+0x309/0x9a0
[ 114.199804][ C0] dev_change_flags+0x8e/0x1d0
[ 114.204763][ C0] devinet_ioctl+0x13ec/0x22c0
[ 114.209866][ C0] inet_ioctl+0x4bd/0x6d0
[ 114.214386][ C0] sock_do_ioctl+0xb7/0x540
[ 114.219190][ C0] sock_ioctl+0x727/0xd70
[ 114.223697][ C0] __se_sys_ioctl+0x261/0x450
[ 114.228714][ C0] __x64_sys_ioctl+0x96/0xe0
[ 114.233472][ C0] x64_sys_call+0x18c0/0x3b90
[ 114.238517][ C0] do_syscall_64+0xcd/0x1e0
[ 114.243222][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.249490][ C0]
[ 114.251937][ C0] CPU: 0 PID: 4799 Comm: S50sshd Not tainted 6.10.0-rc1-syzkaller-00009-gf4a1254f2a07 #0
[ 114.262178][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
[ 114.272668][ C0] =====================================================
[ 114.279876][ C0] Disabling lock debugging due to kernel taint
[ 114.286162][ C0] Kernel panic - not syncing: kmsan.panic set ...
[ 114.292711][ C0] CPU: 0 PID: 4799 Comm: S50sshd Tainted: G B 6.10.0-rc1-syzkaller-00009-gf4a1254f2a07 #0
[ 114.304458][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
[ 114.314789][ C0] Call Trace:
[ 114.318203][ C0] <IRQ>
[ 114.321156][ C0] dump_stack_lvl+0x216/0x2d0
[ 114.326043][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.332094][ C0] dump_stack+0x1e/0x30
[ 114.336442][ C0] panic+0x4e2/0xcd0
[ 114.340533][ C0] ? kmsan_get_metadata+0x111/0x1d0
[ 114.345974][ C0] kmsan_report+0x2d5/0x2e0
[ 114.350698][ C0] ? kmsan_alloc_page+0x182/0x220
[ 114.355934][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.361337][ C0] ? __msan_warning+0x95/0x120
[ 114.366312][ C0] ? receive_buf+0x25e3/0x5fd0
[ 114.371293][ C0] ? virtnet_poll+0xd1c/0x23c0
[ 114.376247][ C0] ? __napi_poll+0xe7/0x980
[ 114.380957][ C0] ? net_rx_action+0x82a/0x1850
[ 114.386121][ C0] ? handle_softirqs+0x1ce/0x800
[ 114.391359][ C0] ? __irq_exit_rcu+0x68/0x120
[ 114.396339][ C0] ? irq_exit_rcu+0x12/0x20
[ 114.401043][ C0] ? common_interrupt+0x94/0xa0
[ 114.406205][ C0] ? asm_common_interrupt+0x2b/0x40
[ 114.411631][ C0] ? unmap_page_range+0x437/0x8670
[ 114.417009][ C0] ? unmap_single_vma+0x380/0x490
[ 114.422335][ C0] ? unmap_vmas+0x34a/0x610
[ 114.427043][ C0] ? exit_mmap+0x236/0xe60
[ 114.431644][ C0] ? __mmput+0x147/0x5d0
[ 114.436101][ C0] ? mmput+0x8a/0xa0
[ 114.440190][ C0] ? exec_mmap+0x80a/0x9b0
[ 114.444795][ C0] ? begin_new_exec+0x1ac4/0x2bd0
[ 114.450011][ C0] ? load_elf_binary+0x1412/0x4e10
[ 114.455320][ C0] ? bprm_execve+0xc57/0x21c0
[ 114.460196][ C0] ? do_execveat_common+0xceb/0xd70
[ 114.465599][ C0] ? __x64_sys_execve+0xf4/0x130
[ 114.470719][ C0] ? x64_sys_call+0x164f/0x3b90
[ 114.475779][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.480647][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.486933][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.493494][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.498917][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.504332][ C0] ? page_to_skb+0xdae/0x1620
[ 114.509232][ C0] __msan_warning+0x95/0x120
[ 114.514026][ C0] receive_buf+0x25e3/0x5fd0
[ 114.518819][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.524319][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.530382][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.535205][ C0] ? __pfx_virtnet_poll+0x10/0x10
[ 114.540952][ C0] __napi_poll+0xe7/0x980
[ 114.545495][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.550961][ C0] net_rx_action+0x82a/0x1850
[ 114.555904][ C0] ? sched_clock_cpu+0x55/0x870
[ 114.560969][ C0] ? __pfx_net_rx_action+0x10/0x10
[ 114.566314][ C0] handle_softirqs+0x1ce/0x800
[ 114.571324][ C0] __irq_exit_rcu+0x68/0x120
[ 114.576116][ C0] irq_exit_rcu+0x12/0x20
[ 114.580642][ C0] common_interrupt+0x94/0xa0
[ 114.585603][ C0] </IRQ>
[ 114.588665][ C0] <TASK>
[ 114.591713][ C0] asm_common_interrupt+0x2b/0x40
[ 114.596959][ C0] RIP: 0010:unmap_page_range+0x437/0x8670
[ 114.602895][ C0] Code: 01 00 00 48 83 bc 24 38 02 00 00 00 0f 85 a2 79 00 00 48 8b bc 24 f8 01 00 00 48 8b 1f 48 89 5c 24 20 e8 4c 22 26 00 4c 8b 30 <44> 8b 22 48 83 e3 9f 49 c7 45 00 00 00 00 00 4c 89 f0 48 83 e0 9f
[ 114.622720][ C0] RSP: 0018:ffff8881178032f0 EFLAGS: 00000286
[ 114.628967][ C0] RAX: ffff88811a3767f8 RBX: 800000011786d067 RCX: 000000011a7767f8
[ 114.637129][ C0] RDX: ffff88811a7767f8 RSI: ffff88813fff9230 RDI: ffff88811ab767f8
[ 114.645292][ C0] RBP: ffff888117803578 R08: ffffea000000000f R09: 0000000000000000
[ 114.653453][ C0] R10: ffff888117003698 R11: 0000000000000004 R12: 0000000000000000
[ 114.661696][ C0] R13: ffff888117a1ac00 R14: 0000000000000000 R15: 00007fef966eafff
[ 114.669872][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.675323][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.680765][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.686196][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.692245][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.697670][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.703716][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.709137][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.715203][ C0] unmap_single_vma+0x380/0x490
[ 114.720293][ C0] unmap_vmas+0x34a/0x610
[ 114.724956][ C0] exit_mmap+0x236/0xe60
[ 114.729417][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.735450][ C0] __mmput+0x147/0x5d0
[ 114.739725][ C0] ? kmsan_internal_unpoison_memory+0x14/0x20
[ 114.746005][ C0] mmput+0x8a/0xa0
[ 114.749934][ C0] exec_mmap+0x80a/0x9b0
[ 114.754382][ C0] begin_new_exec+0x1ac4/0x2bd0
[ 114.759451][ C0] load_elf_binary+0x1412/0x4e10
[ 114.764594][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.770014][ C0] ? kmsan_internal_set_shadow_origin+0x66/0xe0
[ 114.776491][ C0] ? kmsan_internal_unpoison_memory+0x14/0x20
[ 114.782774][ C0] ? load_elf_binary+0x1341/0x4e10
[ 114.788101][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.793557][ C0] ? __pfx_load_elf_binary+0x10/0x10
[ 114.799058][ C0] bprm_execve+0xc57/0x21c0
[ 114.803804][ C0] do_execveat_common+0xceb/0xd70
[ 114.809069][ C0] __x64_sys_execve+0xf4/0x130
[ 114.814046][ C0] x64_sys_call+0x164f/0x3b90
[ 114.818961][ C0] do_syscall_64+0xcd/0x1e0
[ 114.823690][ C0] ? clear_bhb_loop+0x25/0x80
[ 114.828613][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.834753][ C0] RIP: 0033:0x7fef96824ef7
[ 114.839364][ C0] Code: Unable to access opcode bytes at 0x7fef96824ecd.
[ 114.846558][ C0] RSP: 002b:00007ffee5058098 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
[ 114.855184][ C0] RAX: ffffffffffffffda RBX: 0000556bd3625190 RCX: 00007fef96824ef7
[ 114.863430][ C0] RDX: 0000556bd36251a8 RSI: 0000556bd3625190 RDI: 0000556bd3625210
[ 114.871579][ C0] RBP: 0000556bd3625210 R08: 0000556bd3625215 R09: 00007ffee5059fa2
[ 114.879814][ C0] R10: 0000000000000008 R11: 0000000000000246 R12: 0000556bd36251a8
[ 114.887957][ C0] R13: 00007fef969d2904 R14: 0000556bd36251a8 R15: 0000000000000000
[ 114.896125][ C0] </TASK>
[ 114.899544][ C0] Kernel Offset: disabled
[ 114.903930][ 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-build827277809=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at 2aa5052fed
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
go fmt ./sys/... >/dev/null
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=2aa5052fed5f8993afacfce02174322df0f03ec4 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240612-135002'" "-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=2aa5052fed5f8993afacfce02174322df0f03ec4 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240612-135002'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -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 -std=c++17 -I. -Iexecutor/_include -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"2aa5052fed5f8993afacfce02174322df0f03ec4\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12f14736980000
Tested on:
commit: f4a1254f io_uring: fix cancellation overwriting req->f..
git tree: git://git.kernel.dk/linux.git io_uring-6.10
kernel config: https://syzkaller.appspot.com/x/.config?x=54d66e52f38a45d8
dashboard link: https://syzkaller.appspot.com/bug?extid=e6616d0dc8ded5dc56d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.