Extracting prog: 7m50.247013486s Minimizing prog: 50m59.849365329s Simplifying prog options: 0s Extracting C: 3m29.686400185s Simplifying C: 25m36.041041976s extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 6m0s testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program crashed: INFO: task hung in svc_listen program crashed: INFO: task hung in svc_listen single: successfully extracted reproducer found reproducer with 8 syscalls minimizing guilty program testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) listen(r0, 0x81) unshare(0x6a040000) program crashed: lost connection to test machine suppressed program crash: lost connection to test machine testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') ioctl$sock_SIOCGIFINDEX(0xffffffffffffffff, 0x61f0, 0x0) listen(0xffffffffffffffff, 0x81) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, 0x0) r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program did not crash extracting C reproducer testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen simplifying C reproducer testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: no output from test machine a never seen crash title: no output from test machine, ignore testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: no output from test machine a never seen crash title: no output from test machine, ignore testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare program crashed: INFO: task hung in svc_listen testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program crashed: INFO: task hung in svc_listen validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program crashed: INFO: task hung in svc_listen validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_generic-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_SIOCGIFINDEX-listen-unshare detailed listing: executing program 0: socket$nl_generic(0x10, 0x3, 0x10) syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5) close(0x4) syz_open_procfs$namespace(0x0, &(0x7f0000000040)='ns/cgroup\x00') r0 = socket(0x14, 0x2, 0x4) ioctl$sock_SIOCGIFINDEX(r0, 0x61f0, 0x0) listen(r0, 0x81) unshare(0x6a040000) program crashed: INFO: task hung in svc_listen validation run: crashed=true reproducing took 1h39m24.463882395s repro crashed as (corrupted=false): INFO: task syz.4.342:7421 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.342 state:D stack:27032 pid:7421 tgid:7420 ppid:5800 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x164/0x360 kernel/sched/core.c:7283 svc_listen+0x2c3/0x500 net/atm/svc.c:311 __sys_listen_socket net/socket.c:1987 [inline] __sys_listen net/socket.c:2002 [inline] __do_sys_listen net/socket.c:2007 [inline] __se_sys_listen net/socket.c:2005 [inline] __x64_sys_listen+0x1c7/0x240 net/socket.c:2005 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa947d9ce59 RSP: 002b:00007fa948b90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000032 RAX: ffffffffffffffda RBX: 00007fa948015fa0 RCX: 00007fa947d9ce59 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000004 RBP: 00007fa947e32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa948016038 R14: 00007fa948015fa0 R15: 00007ffdf1c6c548 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 6 locks held by kworker/u8:3/48: 5 locks held by kworker/u8:7/153: #0: ffff8880b873aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652 #1: ffff8880b8724588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffff8880b8726118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x8ee/0xf30 kernel/time/timer.c:1117 #3: ffffffff9a6b8cf0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580 lib/debugobjects.c:835 #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495 8 locks held by kworker/u8:9/3273: 2 locks held by getty/5386: #0: ffff888032a2e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 1 lock held by syz.4.342/7421: #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.1.414/7744: #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.3.611/8709: #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.6.637/8830: #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.0.742/9319: #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.9.990/10528: #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 2 locks held by syz.2.1305/11970: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.7.1304/11974: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.8.1307/11978: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.5.1308/11983: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d7/0x840 net/ipv4/ip_tunnel.c:1146 2 locks held by syz.4.1309/11988: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x1a/0xa0 net/core/dev.c:2102 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 9b 7d 02 e9 93 f7 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 91 20 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc90000197e20 EFLAGS: 00000246 RAX: 00000000001162af RBX: ffffffff819a958a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8dfa6c27 RDI: ffffffff8c28af60 RBP: ffffc90000197f10 R08: ffff8880b87339db R09: 1ffff110170e673b R10: dffffc0000000000 R11: ffffed10170e673c R12: 0000000000000001 R13: 1ffff11003b5b000 R14: 0000000000000001 R15: 1ffff11003b5b000 FS: 0000000000000000(0000) GS:ffff88812538a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34a24224 CR3: 0000000078488000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x147 final repro crashed as (corrupted=false): INFO: task syz.4.342:7421 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.342 state:D stack:27032 pid:7421 tgid:7420 ppid:5800 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x164/0x360 kernel/sched/core.c:7283 svc_listen+0x2c3/0x500 net/atm/svc.c:311 __sys_listen_socket net/socket.c:1987 [inline] __sys_listen net/socket.c:2002 [inline] __do_sys_listen net/socket.c:2007 [inline] __se_sys_listen net/socket.c:2005 [inline] __x64_sys_listen+0x1c7/0x240 net/socket.c:2005 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa947d9ce59 RSP: 002b:00007fa948b90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000032 RAX: ffffffffffffffda RBX: 00007fa948015fa0 RCX: 00007fa947d9ce59 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000004 RBP: 00007fa947e32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa948016038 R14: 00007fa948015fa0 R15: 00007ffdf1c6c548 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 6 locks held by kworker/u8:3/48: 5 locks held by kworker/u8:7/153: #0: ffff8880b873aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652 #1: ffff8880b8724588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffff8880b8726118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x8ee/0xf30 kernel/time/timer.c:1117 #3: ffffffff9a6b8cf0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580 lib/debugobjects.c:835 #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495 8 locks held by kworker/u8:9/3273: 2 locks held by getty/5386: #0: ffff888032a2e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 1 lock held by syz.4.342/7421: #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.1.414/7744: #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.3.611/8709: #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.6.637/8830: #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.0.742/9319: #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.9.990/10528: #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 2 locks held by syz.2.1305/11970: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.7.1304/11974: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.8.1307/11978: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.5.1308/11983: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d7/0x840 net/ipv4/ip_tunnel.c:1146 2 locks held by syz.4.1309/11988: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x1a/0xa0 net/core/dev.c:2102 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 9b 7d 02 e9 93 f7 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 91 20 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc90000197e20 EFLAGS: 00000246 RAX: 00000000001162af RBX: ffffffff819a958a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8dfa6c27 RDI: ffffffff8c28af60 RBP: ffffc90000197f10 R08: ffff8880b87339db R09: 1ffff110170e673b R10: dffffc0000000000 R11: ffffed10170e673c R12: 0000000000000001 R13: 1ffff11003b5b000 R14: 0000000000000001 R15: 1ffff11003b5b000 FS: 0000000000000000(0000) GS:ffff88812538a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34a24224 CR3: 0000000078488000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x147