ci-upstream-kasan-gce-smack-root/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci-upstream-kasan-gce-smack-root/syz-executor898091726 <...> Warning: Permanently added '10.128.1.186' (ED25519) to the list of known hosts. execve("ci-upstream-kasan-gce-smack-root/syz-executor898091726", ["ci-upstream-kasan-gce-smack-root/syz-executor898091726"], 0x7ffd3bce6960 /* 10 vars */) = 0 brk(NULL) = 0x55558d6e5000 brk(0x55558d6e5d80) = 0x55558d6e5d80 arch_prctl(ARCH_SET_FS, 0x55558d6e5400) = 0 set_tid_address(0x55558d6e56d0) = 5611 set_robust_list(0x55558d6e56e0, 24) = 0 rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlinkat(AT_FDCWD, "/proc/self/exe", "/root/ci-upstream-kasan-gce-smack-root/syz-executor898091726", 4096) = 60 getrandom("\x2a\x89\x59\x86\x5c\x77\x8f\xb2", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558d6e5d80 brk(0x55558d706d80) = 0x55558d706d80 brk(0x55558d707000) = 0x55558d707000 mprotect(0x7f1e983e9000, 20480, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDci-upstream-kasan-gce-smack-root/strace-static-x86_64: Process 5612 attached , child_tidptr=0x55558d6e56d0) = 5612 [pid 5612] set_robust_list(0x55558d6e56e0, 24) = 0 [pid 5611] rt_sigprocmask(SIG_SETMASK, [] [pid 5612] rt_sigprocmask(SIG_SETMASK, [] [pid 5611] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 5612] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 5612] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5612] setpgid(0, 0) = 0 [pid 5612] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5612] write(3, "1000", 4) = 4 [pid 5612] close(3) = 0 [pid 5612] write(1, "executing program\n", 18) = 18 executing program [pid 5612] openat(AT_FDCWD, "/dev/raw-gadget", O_RDWR) = 3 [pid 5612] ioctl(3, USB_RAW_IOCTL_INIT, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, UI_DEV_CREATE or USB_RAW_IOCTL_RUN, 0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 18 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [ 83.293207][ T821] usb 1-1: new high-speed USB device number 2 using dummy_hcd [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 18 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 9 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 74 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 4 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 8 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 8 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fffed84bab0) = 8 [pid 5612] ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fffed84cac0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_VBUS_DRAW, 0x32) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_CONFIGURE, 0) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb4c) = 0 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb5c) = 9 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb6c) = 10 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb7c) = 1 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb8c) = 12 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efb9c) = 11 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efbac) = 15 [ 83.530248][ T821] usb 1-1: New USB device found, idVendor=05c5, idProduct=0002, bcdDevice= 1.00 [ 83.530275][ T821] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 83.530292][ T821] usb 1-1: Product: syz [ 83.530305][ T821] usb 1-1: Manufacturer: syz [ 83.530317][ T821] usb 1-1: SerialNumber: syz [pid 5612] ioctl(3, USB_RAW_IOCTL_EP_ENABLE, 0x7f1e983efbbc) = 13 [pid 5612] ioctl(3, USB_RAW_IOCTL_EP0_READ, 0x7fffed84bab0) = 0 [ 83.627465][ T821] digi_acceleport 1-1:1.0: Digi 2 port USB adapter converter detected [ 83.637390][ T821] usb 1-1: Digi 2 port USB adapter converter now attached to ttyUSB0 [ 83.658984][ T821] usb 1-1: Digi 2 port USB adapter converter now attached to ttyUSB1 [ 83.668518][ T821] usb 1-1: Digi 2 port USB adapter converter now attached to ttyUSB2 [pid 5612] mkdir("mnt", 0777) = 0 [pid 5612] mount(NULL, "mnt", "devtmpfs", 0, NULL) = 0 [ 86.700940][ T31] cfg80211: failed to load regulatory.db [pid 5612] openat(AT_FDCWD, "mnt/ttyUSB0", O_RDWR|O_DIRECT|O_LARGEFILE|FASYNC [pid 5611] kill(-5612, SIGKILL) = 0 [pid 5611] kill(5612, SIGKILL) = 0 [ 88.020476][ T5612] [ 88.020488][ T5612] ============================================ [ 88.020494][ T5612] WARNING: possible recursive locking detected [ 88.020512][ T5612] syzkaller #0 Not tainted [ 88.020523][ T5612] -------------------------------------------- [ 88.020530][ T5612] syz-executor898/5612 is trying to acquire lock: [ 88.020540][ T5612] ffff8880390bf858 (&priv->dp_port_lock){+.+.}-{3:3}, at: digi_set_modem_signals+0x19d/0x8c0 [ 88.020617][ T5612] [ 88.020617][ T5612] but task is already holding lock: [ 88.020622][ T5612] ffff888038f68058 (&priv->dp_port_lock){+.+.}-{3:3}, at: digi_set_modem_signals+0x195/0x8c0 [ 88.020668][ T5612] [ 88.020668][ T5612] other info that might help us debug this: [ 88.020674][ T5612] Possible unsafe locking scenario: [ 88.020674][ T5612] [ 88.020680][ T5612] CPU0 [ 88.020684][ T5612] ---- [ 88.020688][ T5612] lock(&priv->dp_port_lock); [ 88.020700][ T5612] lock(&priv->dp_port_lock); [ 88.020712][ T5612] [ 88.020712][ T5612] *** DEADLOCK *** [ 88.020712][ T5612] [ 88.020717][ T5612] May be due to missing lock nesting notation [ 88.020717][ T5612] [ 88.020723][ T5612] 3 locks held by syz-executor898/5612: [ 88.020732][ T5612] #0: ffff888037ea81a0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev+0x74/0x4d0 [ 88.020773][ T5612] #1: ffff888038f68058 (&priv->dp_port_lock){+.+.}-{3:3}, at: digi_set_modem_signals+0x195/0x8c0 [ 88.020816][ T5612] #2: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 [ 88.020861][ T5612] [ 88.020861][ T5612] stack backtrace: [ 88.020876][ T5612] CPU: 0 UID: 0 PID: 5612 Comm: syz-executor898 Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 88.020898][ T5612] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 88.020913][ T5612] Call Trace: [ 88.020918][ T5612] [ 88.020924][ T5612] dump_stack_lvl+0xe8/0x150 [ 88.020949][ T5612] print_deadlock_bug+0x279/0x290 [ 88.020969][ T5612] __lock_acquire+0x24df/0x2ce0 [ 88.020990][ T5612] ? __pfx_rtlock_slowlock_locked+0x10/0x10 [ 88.021005][ T5612] ? digi_set_modem_signals+0x19d/0x8c0 [ 88.021026][ T5612] lock_acquire+0x106/0x350 [ 88.021040][ T5612] ? digi_set_modem_signals+0x19d/0x8c0 [ 88.021063][ T5612] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 88.021081][ T5612] rt_spin_lock+0x83/0x400 [ 88.021101][ T5612] ? digi_set_modem_signals+0x19d/0x8c0 [ 88.021123][ T5612] ? __pfx_rt_spin_lock+0x10/0x10 [ 88.021147][ T5612] digi_set_modem_signals+0x19d/0x8c0 [ 88.021168][ T5612] ? _raw_spin_unlock_irqrestore+0x4c/0x80 [ 88.021184][ T5612] ? rt_mutex_slowunlock+0x4ee/0xa20 [ 88.021207][ T5612] ? __pfx_rt_mutex_slowunlock+0x10/0x10 [ 88.021229][ T5612] ? __pfx_digi_set_modem_signals+0x10/0x10 [ 88.021252][ T5612] ? rt_spin_unlock+0x157/0x200 [ 88.021274][ T5612] ? rt_spin_unlock+0x163/0x200 [ 88.021295][ T5612] ? __pfx_serial_port_dtr_rts+0x10/0x10 [ 88.021314][ T5612] tty_port_block_til_ready+0x386/0x890 [ 88.021337][ T5612] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 88.021357][ T5612] ? __pfx_tty_port_block_til_ready+0x10/0x10 [ 88.021385][ T5612] ? __pfx_autoremove_wake_function+0x10/0x10 [ 88.021409][ T5612] ? tty_port_open+0x234/0x2b0 [ 88.021431][ T5612] tty_open+0x496/0xcd0 [ 88.021455][ T5612] ? __pfx_tty_open+0x10/0x10 [ 88.021474][ T5612] ? rt_spin_unlock+0x157/0x200 [ 88.021497][ T5612] ? rt_spin_unlock+0x163/0x200 [ 88.021519][ T5612] chrdev_open+0x4dc/0x600 [ 88.021542][ T5612] ? __pfx_chrdev_open+0x10/0x10 [ 88.021561][ T5612] ? fsnotify_open_perm_and_set_mode+0x13b/0x6c0 [ 88.021582][ T5612] ? __pfx_chrdev_open+0x10/0x10 [ 88.021602][ T5612] do_dentry_open+0x849/0x1420 [ 88.021619][ T5612] vfs_open+0x3b/0x350 [ 88.021631][ T5612] ? path_openat+0x2e49/0x3850 [ 88.021650][ T5612] path_openat+0x2e60/0x3850 [ 88.021669][ T5612] ? kmem_cache_alloc_noprof+0x355/0x650 [ 88.021684][ T5612] ? __x64_sys_openat+0x138/0x170 [ 88.021698][ T5612] ? do_syscall_64+0x174/0x580 [ 88.021714][ T5612] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.021735][ T5612] do_file_open+0x23e/0x4a0 [ 88.021755][ T5612] ? lockdep_hardirqs_on+0x7a/0x110 [ 88.021773][ T5612] ? __pfx_do_file_open+0x10/0x10 [pid 5611] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5611] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5611] getdents64(3, 0x55558d6e67a0 /* 2 entries */, 32768) = 48 [ 88.021797][ T5612] ? alloc_fd+0x654/0x6d0 [ 88.021815][ T5612] do_sys_openat2+0x115/0x200 [ 88.021832][ T5612] ? __pfx_do_sys_openat2+0x10/0x10 [ 88.021850][ T5612] __x64_sys_openat+0x138/0x170 [ 88.021865][ T5612] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.021879][ T5612] do_syscall_64+0x174/0x580 [ 88.021897][ T5612] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.021911][ T5612] ? clear_bhb_loop+0x40/0x90 [ 88.021928][ T5612] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.021943][ T5612] RIP: 0033:0x7f1e98355fc9 [pid 5611] getdents64(3, 0x55558d6e67a0 /* 0 entries */, 32768) = 0 [pid 5611] close(3) = 0 [ 88.021962][ T5612] Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 [ 88.021975][ T5612] RSP: 002b:00007fffed84db08 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 88.021990][ T5612] RAX: ffffffffffffffda RBX: 0000200000000400 RCX: 00007f1e98355fc9 [ 88.022001][ T5612] RDX: 000000000000e002 RSI: 0000200000000400 RDI: 00000000ffffff9c [ 88.022011][ T5612] RBP: 0000200000000408 R08: 0000000000000006 R09: 0000000000000006 [ 88.022020][ T5612] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffed84dc78 [ 88.022030][ T5612] R13: 431bde82d7b634db R14: 00007f1e983e9c40 R15: 0000000000000002 [ 88.022046][ T5612]