From: syzbot <syzbot+4e21d5f67b886a692b55@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, lizhi.xu@windriver.com,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [fs?] BUG: corrupted list in remove_wait_queue (2)
Date: Sun, 16 Feb 2025 23:49:04 -0800 [thread overview]
Message-ID: <67b2e9f0.050a0220.173698.001e.GAE@google.com> (raw)
In-Reply-To: <20250217072635.2581421-1-lizhi.xu@windriver.com>
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
x64_sys_ppoll+0x10/0x10
[ 290.731692][ T30] do_syscall_64+0xcd/0x250
[ 290.736222][ T30] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 290.742188][ T30] RIP: 0033:0x7f73a7655ad5
[ 290.746833][ T30] RSP: 002b:00007ffe72d11e20 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
[ 290.755346][ T30] RAX: ffffffffffffffda RBX: 0000560ad729aee0 RCX: 00007f73a7655ad5
[ 290.763447][ T30] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000560ad729aec0
[ 290.771556][ T30] RBP: 00007ffe72d12170 R08: 0000000000000008 R09: 00007f73a772db40
[ 290.779578][ T30] R10: 00007ffe72d12170 R11: 0000000000000246 R12: 0000000000000000
[ 290.787562][ T30] R13: 0000560aac154610 R14: 0000000000000003 R15: 0000000000000000
[ 290.795697][ T30] </TASK>
[ 290.798731][ T30] Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings
[ 290.808055][ T30] INFO: task dhcpcd:5459 blocked for more than 147 seconds.
[ 290.815568][ T30] Not tainted 6.14.0-rc3-syzkaller-g0ad2507d5d93-dirty #0
[ 290.823253][ T30] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 290.832145][ T30] task:dhcpcd state:D stack:26496 pid:5459 tgid:5459 ppid:5455 task_flags:0x400140 flags:0x00000002
[ 290.844203][ T30] Call Trace:
[ 290.847520][ T30] <TASK>
[ 290.850575][ T30] __schedule+0xf43/0x5890
[ 290.855023][ T30] ? __pfx___lock_acquire+0x10/0x10
[ 290.860293][ T30] ? __pfx___lock_acquire+0x10/0x10
[ 290.865524][ T30] ? __pfx___schedule+0x10/0x10
[ 290.870478][ T30] ? schedule+0x298/0x350
[ 290.874855][ T30] ? __pfx_lock_release+0x10/0x10
[ 290.879964][ T30] ? __mutex_trylock_common+0x78/0x250
[ 290.885453][ T30] ? lock_acquire+0x2f/0xb0
[ 290.890068][ T30] ? schedule+0x1fd/0x350
[ 290.894446][ T30] schedule+0xe7/0x350
[ 290.898633][ T30] schedule_preempt_disabled+0x13/0x30
[ 290.904183][ T30] __mutex_lock+0x6bd/0xb10
[ 290.908716][ T30] ? do_sys_poll+0x2d0/0xe00
[ 290.913403][ T30] ? __pfx___mutex_lock+0x10/0x10
[ 290.918494][ T30] ? __pfx_lock_release+0x10/0x10
[ 290.923613][ T30] ? trace_lock_acquire+0x14e/0x1f0
[ 290.928841][ T30] ? __might_fault+0xe3/0x190
[ 290.933619][ T30] ? do_sys_poll+0x2d0/0xe00
[ 290.938227][ T30] do_sys_poll+0x2d0/0xe00
[ 290.942703][ T30] ? kasan_save_stack+0x42/0x60
[ 290.947598][ T30] ? kasan_save_stack+0x33/0x60
[ 290.952546][ T30] ? kasan_save_track+0x14/0x30
[ 290.957418][ T30] ? kasan_save_free_info+0x3b/0x60
[ 290.962730][ T30] ? __kasan_slab_free+0x51/0x70
[ 290.967708][ T30] ? do_seccomp+0x7b6/0x2640
[ 290.972379][ T30] ? prctl_set_seccomp+0x4b/0x70
[ 290.977354][ T30] ? __pfx_do_sys_poll+0x10/0x10
[ 290.982562][ T30] ? __lock_acquire+0x15a9/0x3c40
[ 290.987646][ T30] ? _raw_spin_unlock_irq+0x23/0x50
[ 290.993013][ T30] ? lockdep_hardirqs_on+0x7c/0x110
[ 290.998264][ T30] ? _raw_spin_unlock_irq+0x2e/0x50
[ 291.003613][ T30] ? set_user_sigmask+0x217/0x2a0
[ 291.008835][ T30] ? __pfx_set_user_sigmask+0x10/0x10
[ 291.014322][ T30] ? __pfx___seccomp_filter+0x10/0x10
[ 291.019761][ T30] __x64_sys_ppoll+0x25a/0x2d0
[ 291.024530][ T30] ? __pfx___x64_sys_ppoll+0x10/0x10
[ 291.029895][ T30] ? __secure_computing+0x273/0x3f0
[ 291.035156][ T30] do_syscall_64+0xcd/0x250
[ 291.039834][ T30] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 291.045747][ T30] RIP: 0033:0x7f73a7655ad5
[ 291.050246][ T30] RSP: 002b:00007ffe72d11e20 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
[ 291.058866][ T30] RAX: ffffffffffffffda RBX: 0000560ad729aee0 RCX: 00007f73a7655ad5
[ 291.066939][ T30] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000560ad72a3fe0
[ 291.074970][ T30] RBP: 00007ffe72d12170 R08: 0000000000000008 R09: 0000560aac1543d0
[ 291.083120][ T30] R10: 00007ffe72d12170 R11: 0000000000000246 R12: 0000000000000000
[ 291.091194][ T30] R13: 0000560aac154610 R14: 0000000000000003 R15: 0000000000000000
[ 291.099293][ T30] </TASK>
[ 291.102341][ T30] Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings
[ 291.111627][ T30] INFO: task dhcpcd:5460 blocked for more than 147 seconds.
[ 291.118925][ T30] Not tainted 6.14.0-rc3-syzkaller-g0ad2507d5d93-dirty #0
[ 291.126598][ T30] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 291.135463][ T30] task:dhcpcd state:D stack:26832 pid:5460 tgid:5460 ppid:5455 task_flags:0x400140 flags:0x00000002
[ 291.147505][ T30] Call Trace:
[ 291.150846][ T30] <TASK>
[ 291.153773][ T30] __schedule+0xf43/0x5890
[ 291.158186][ T30] ? __pfx___lock_acquire+0x10/0x10
[ 291.163449][ T30] ? __pfx___lock_acquire+0x10/0x10
[ 291.168881][ T30] ? __pfx___schedule+0x10/0x10
[ 291.173882][ T30] ? schedule+0x298/0x350
[ 291.178244][ T30] ? __pfx_lock_release+0x10/0x10
[ 291.183389][ T30] ? __mutex_trylock_common+0x78/0x250
[ 291.188915][ T30] ? lock_acquire+0x2f/0xb0
[ 291.193503][ T30] ? schedule+0x1fd/0x350
[ 291.197860][ T30] schedule+0xe7/0x350
[ 291.202004][ T30] schedule_preempt_disabled+0x13/0x30
[ 291.207504][ T30] __mutex_lock+0x6bd/0xb10
[ 291.212094][ T30] ? do_sys_poll+0x2d0/0xe00
[ 291.216708][ T30] ? __pfx___mutex_lock+0x10/0x10
[ 291.221799][ T30] ? __pfx_lock_release+0x10/0x10
[ 291.226843][ T30] ? trace_lock_acquire+0x14e/0x1f0
[ 291.232148][ T30] ? __might_fault+0xe3/0x190
[ 291.236868][ T30] ? do_sys_poll+0x2d0/0xe00
[ 291.241634][ T30] do_sys_poll+0x2d0/0xe00
[ 291.246100][ T30] ? kasan_save_stack+0x42/0x60
[ 291.251100][ T30] ? kasan_save_stack+0x33/0x60
[ 291.255986][ T30] ? kasan_save_track+0x14/0x30
[ 291.260988][ T30] ? kasan_save_free_info+0x3b/0x60
[ 291.266242][ T30] ? __kasan_slab_free+0x51/0x70
[ 291.271273][ T30] ? do_seccomp+0x7b6/0x2640
[ 291.275883][ T30] ? prctl_set_seccomp+0x4b/0x70
[ 291.280932][ T30] ? __pfx_do_sys_poll+0x10/0x10
[ 291.285992][ T30] ? __lock_acquire+0x15a9/0x3c40
[ 291.291144][ T30] ? _raw_spin_unlock_irq+0x23/0x50
[ 291.296382][ T30] ? lockdep_hardirqs_on+0x7c/0x110
[ 291.301644][ T30] ? _raw_spin_unlock_irq+0x2e/0x50
[ 291.306873][ T30] ? set_user_sigmask+0x217/0x2a0
[ 291.312079][ T30] ? __pfx_set_user_sigmask+0x10/0x10
[ 291.317479][ T30] ? __pfx___seccomp_filter+0x10/0x10
[ 291.322906][ T30] __x64_sys_ppoll+0x25a/0x2d0
[ 291.327720][ T30] ? __pfx___x64_sys_ppoll+0x10/0x10
[ 291.333098][ T30] ? __secure_computing+0x273/0x3f0
[ 291.338322][ T30] do_syscall_64+0xcd/0x250
[ 291.342906][ T30] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 291.348835][ T30] RIP: 0033:0x7f73a7655ad5
[ 291.353323][ T30] RSP: 002b:00007ffe72d11e20 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
[ 291.361809][ T30] RAX: ffffffffffffffda RBX: 0000560ad729aee0 RCX: 00007f73a7655ad5
[ 291.369858][ T30] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000560ad72a3fe0
[ 291.377851][ T30] RBP: 00007ffe72d12170 R08: 0000000000000008 R09: 0000560aac1543d0
[ 291.385916][ T30] R10: 00007ffe72d12170 R11: 0000000000000246 R12: 0000000000000000
[ 291.393989][ T30] R13: 0000560aac154610 R14: 0000000000000003 R15: 0000000000000000
[ 291.402027][ T30] </TASK>
[ 291.405086][ T30] Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings
[ 291.414264][ T30]
[ 291.414264][ T30] Showing all locks held in the system:
[ 291.422038][ T30] 1 lock held by khungtaskd/30:
[ 291.426879][ T30] #0: ffffffff8e1bc140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390
[ 291.436858][ T30] 1 lock held by udevd/5211:
[ 291.441501][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.450767][ T30] 1 lock held by udevd/5212:
[ 291.455375][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.464517][ T30] 1 lock held by udevd/5213:
[ 291.469156][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.478241][ T30] 1 lock held by udevd/5214:
[ 291.482870][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.492033][ T30] 1 lock held by udevd/5215:
[ 291.496615][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.505760][ T30] 1 lock held by udevd/5216:
[ 291.510433][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.519700][ T30] 1 lock held by udevd/5217:
[ 291.524339][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.533509][ T30] 1 lock held by udevd/5218:
[ 291.538130][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.547238][ T30] 1 lock held by udevd/5219:
[ 291.551886][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.561003][ T30] 1 lock held by udevd/5220:
[ 291.565599][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.574739][ T30] 1 lock held by udevd/5221:
[ 291.579362][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.588420][ T30] 1 lock held by udevd/5222:
[ 291.593070][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.602195][ T30] 1 lock held by dhcpcd/5439:
[ 291.606873][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.616059][ T30] 1 lock held by dhcpcd/5455:
[ 291.620790][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.629941][ T30] 1 lock held by dhcpcd/5456:
[ 291.634625][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.643772][ T30] 1 lock held by dhcpcd/5459:
[ 291.648458][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.657626][ T30] 1 lock held by dhcpcd/5460:
[ 291.662340][ T30] #0: ffffffff8e3c1a48 (syspoll_lock){+.+.}-{4:4}, at: do_sys_poll+0x2d0/0xe00
[ 291.671689][ T30]
[ 291.674036][ T30] =============================================
[ 291.674036][ T30]
[ 291.682563][ T30] NMI backtrace for cpu 1
[ 291.682578][ T30] CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc3-syzkaller-g0ad2507d5d93-dirty #0
[ 291.682600][ T30] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
[ 291.682611][ T30] Call Trace:
[ 291.682617][ T30] <TASK>
[ 291.682625][ T30] dump_stack_lvl+0x116/0x1f0
[ 291.682658][ T30] nmi_cpu_backtrace+0x27b/0x390
[ 291.682690][ T30] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10
[ 291.682715][ T30] nmi_trigger_cpumask_backtrace+0x29c/0x300
[ 291.682737][ T30] watchdog+0xf62/0x12b0
[ 291.682768][ T30] ? __pfx_watchdog+0x10/0x10
[ 291.682793][ T30] ? lockdep_hardirqs_on+0x7c/0x110
[ 291.682821][ T30] ? __kthread_parkme+0x148/0x220
[ 291.682854][ T30] ? __pfx_watchdog+0x10/0x10
[ 291.682882][ T30] kthread+0x3af/0x750
[ 291.682906][ T30] ? __pfx_kthread+0x10/0x10
[ 291.682933][ T30] ? __pfx_kthread+0x10/0x10
[ 291.682957][ T30] ret_from_fork+0x45/0x80
[ 291.682984][ T30] ? __pfx_kthread+0x10/0x10
[ 291.683004][ T30] ret_from_fork_asm+0x1a/0x30
[ 291.683036][ T30] </TASK>
[ 291.683044][ T30] Sending NMI from CPU 1 to CPUs 0:
[ 291.795725][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20
[ 291.796705][ T30] Kernel panic - not syncing: hung_task: blocked tasks
[ 291.796720][ T30] CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc3-syzkaller-g0ad2507d5d93-dirty #0
[ 291.796745][ T30] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
[ 291.796759][ T30] Call Trace:
[ 291.796767][ T30] <TASK>
[ 291.796776][ T30] dump_stack_lvl+0x3d/0x1f0
[ 291.796811][ T30] panic+0x71d/0x800
[ 291.796833][ T30] ? __pfx_panic+0x10/0x10
[ 291.796853][ T30] ? __pfx__printk+0x10/0x10
[ 291.796878][ T30] ? ret_from_fork_asm+0x1a/0x30
[ 291.796908][ T30] ? irq_work_claim+0x76/0xa0
[ 291.796936][ T30] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10
[ 291.796963][ T30] ? irq_work_queue+0x2a/0x80
[ 291.796990][ T30] ? watchdog+0xdcc/0x12b0
[ 291.797018][ T30] ? watchdog+0xdbf/0x12b0
[ 291.797049][ T30] watchdog+0xddd/0x12b0
[ 291.797082][ T30] ? __pfx_watchdog+0x10/0x10
[ 291.797108][ T30] ? lockdep_hardirqs_on+0x7c/0x110
[ 291.797136][ T30] ? __kthread_parkme+0x148/0x220
[ 291.797169][ T30] ? __pfx_watchdog+0x10/0x10
[ 291.797197][ T30] kthread+0x3af/0x750
[ 291.797222][ T30] ? __pfx_kthread+0x10/0x10
[ 291.797250][ T30] ? __pfx_kthread+0x10/0x10
[ 291.797273][ T30] ret_from_fork+0x45/0x80
[ 291.797311][ T30] ? __pfx_kthread+0x10/0x10
[ 291.797335][ T30] ret_from_fork_asm+0x1a/0x30
[ 291.797371][ T30] </TASK>
[ 291.939091][ T30] Kernel Offset: disabled
[ 291.943412][ T30] 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/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/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='go1.22.7'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs/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-build2848228343=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at f2cb035c8f
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=f2cb035c8f931efff4a020b164e657f16f51934b -X 'github.com/google/syzkaller/prog.gitRevisionDate=20250117-180932'" "-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 -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"f2cb035c8f931efff4a020b164e657f16f51934b\"
/usr/bin/ld: /tmp/ccI4knEC.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=173adbf8580000
Tested on:
commit: 0ad2507d Linux 6.14-rc3
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=179507154deeb15f
dashboard link: https://syzkaller.appspot.com/bug?extid=4e21d5f67b886a692b55
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11f26898580000
next parent reply other threads:[~2025-02-17 7:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250217072635.2581421-1-lizhi.xu@windriver.com>
2025-02-17 7:49 ` syzbot [this message]
2025-01-22 23:27 syzbot
2025-07-07 9:30 ` syzbot
2025-07-07 11:26 ` Hillf Danton
2025-07-07 11:43 ` syzbot
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