[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.411801] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.391369] random: sshd: uninitialized urandom read (32 bytes read) [ 28.796913] random: sshd: uninitialized urandom read (32 bytes read) [ 29.326140] random: sshd: uninitialized urandom read (32 bytes read) [ 29.513511] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 35.060753] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 35.158336] usb usb1: usbfs: interface 0 claimed by hub while 'syz-executor177' sets config #0 [ 35.172118] usb usb1: usbfs: process 4640 (syz-executor177) did not claim interface 0 before use [ 35.186577] kasan: CONFIG_KASAN_INLINE enabled [ 35.191285] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.198806] general protection fault: 0000 [#1] SMP KASAN [ 35.204354] CPU: 1 PID: 4641 Comm: syz-executor177 Not tainted 4.19.0-rc1+ #215 [ 35.211778] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.221143] RIP: 0010:usb_find_alt_setting+0x38/0x310 [ 35.226315] Code: 89 fb 48 83 ec 10 48 89 7d c8 89 55 d4 89 75 d0 e8 bd 0e 0b fd 48 8d 7b 04 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 86 02 00 00 [ 35.245195] RSP: 0018:ffff8801ba7274a8 EFLAGS: 00010247 [ 35.250538] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8476da79 [ 35.257789] RDX: 0000000000000000 RSI: ffffffff8471b1c3 RDI: 0000000000000004 [ 35.265043] RBP: ffff8801ba7274e0 R08: ffff8801bab5c400 R09: ffffed00374e4eb2 [ 35.272293] R10: ffffed00374e4eb4 R11: ffff8801ba7275a7 R12: 0000000000000000 [ 35.279543] R13: ffff8801ce48d500 R14: ffff8801bb55f840 R15: 0000000000000000 [ 35.286796] FS: 0000000001231880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.295017] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.300882] CR2: 00000000006cf090 CR3: 00000001baf94000 CR4: 00000000001406e0 [ 35.308136] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.315393] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.322641] Call Trace: [ 35.325218] check_ctrlrecip+0x1e6/0x320 [ 35.329286] ? _copy_from_user+0xdf/0x150 [ 35.333416] proc_control+0x151/0xef0 [ 35.337199] ? mark_held_locks+0x160/0x160 [ 35.341417] ? proc_bulk+0xaa0/0xaa0 [ 35.345109] ? lock_downgrade+0x8f0/0x8f0 [ 35.349256] usbdev_do_ioctl+0x1eb4/0x3b30 [ 35.353484] ? processcompl_compat+0x680/0x680 [ 35.358049] ? mntput_no_expire+0x1ea/0xc10 [ 35.362351] ? __lock_acquire+0x7fc/0x5020 [ 35.366567] ? graph_lock+0x170/0x170 [ 35.370352] ? dput.part.26+0x276/0x7a0 [ 35.374321] ? find_held_lock+0x36/0x1c0 [ 35.378365] ? lock_downgrade+0x8f0/0x8f0 [ 35.382500] ? kasan_check_read+0x11/0x20 [ 35.386629] ? rcu_is_watching+0x8c/0x150 [ 35.390757] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 35.395408] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 35.400062] ? is_bpf_text_address+0xd7/0x170 [ 35.404542] ? kernel_text_address+0x79/0xf0 [ 35.408933] ? __kernel_text_address+0xd/0x40 [ 35.413413] ? unwind_get_return_address+0x61/0xa0 [ 35.418326] ? __save_stack_trace+0x8d/0xf0 [ 35.422642] ? save_stack+0xa9/0xd0 [ 35.426257] ? save_stack+0x43/0xd0 [ 35.429865] ? __kasan_slab_free+0x11a/0x170 [ 35.434258] ? kasan_slab_free+0xe/0x10 [ 35.438213] ? kmem_cache_free+0x86/0x280 [ 35.442344] ? putname+0xf2/0x130 [ 35.445792] ? do_sys_open+0x569/0x720 [ 35.449665] ? __x64_sys_open+0x7e/0xc0 [ 35.453624] ? do_syscall_64+0x1b9/0x820 [ 35.457674] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.463034] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.467422] ? kasan_check_read+0x11/0x20 [ 35.471578] ? do_raw_spin_unlock+0xa7/0x2f0 [ 35.475976] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.480367] ? kasan_check_write+0x14/0x20 [ 35.484583] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.488984] usbdev_ioctl+0x25/0x30 [ 35.492600] ? usbdev_compat_ioctl+0x30/0x30 [ 35.496994] do_vfs_ioctl+0x1de/0x1720 [ 35.500862] ? kasan_check_read+0x11/0x20 [ 35.504993] ? rcu_is_watching+0x8c/0x150 [ 35.509120] ? trace_hardirqs_on+0xbd/0x2c0 [ 35.513427] ? ioctl_preallocate+0x300/0x300 [ 35.517822] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.523364] ? __fget_light+0x2f7/0x440 [ 35.527326] ? putname+0xf2/0x130 [ 35.530769] ? fget_raw+0x20/0x20 [ 35.534211] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.539210] ? kmem_cache_free+0x246/0x280 [ 35.543431] ? do_syscall_64+0x9a/0x820 [ 35.547386] ? do_syscall_64+0x9a/0x820 [ 35.551345] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.555914] ? security_file_ioctl+0x94/0xc0 [ 35.560307] ksys_ioctl+0xa9/0xd0 [ 35.563743] __x64_sys_ioctl+0x73/0xb0 [ 35.567618] do_syscall_64+0x1b9/0x820 [ 35.571490] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.576837] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.581748] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.586573] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 35.591571] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.596569] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.601568] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.606395] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.611566] RIP: 0033:0x444b19 [ 35.614750] Code: e8 0c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 db ce fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 35.633642] RSP: 002b:00007ffffd7d0408 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 35.641430] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444b19 [ 35.648710] RDX: 0000000020000280 RSI: 00000000c0185500 RDI: 0000000000000005 [ 35.655986] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000004002e0 [ 35.663249] R10: 000000000000ffff R11: 0000000000000217 R12: 000000000000893f [ 35.670586] R13: 0000000000401f10 R14: 0000000000000000 R15: 0000000000000000 [ 35.677841] Modules linked in: [ 35.681016] Dumping ftrace buffer: [ 35.684536] (ftrace buffer empty) [ 35.688289] ---[ end trace f80beb69e56f2f62 ]--- [ 35.693073] RIP: 0010:usb_find_alt_setting+0x38/0x310 [ 35.698284] Code: 89 fb 48 83 ec 10 48 89 7d c8 89 55 d4 89 75 d0 e8 bd 0e 0b fd 48 8d 7b 04 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 86 02 00 00 [ 35.717210] RSP: 0018:ffff8801ba7274a8 EFLAGS: 00010247 [ 35.722596] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8476da79 [ 35.729886] RDX: 0000000000000000 RSI: ffffffff8471b1c3 RDI: 0000000000000004 [ 35.737170] RBP: ffff8801ba7274e0 R08: ffff8801bab5c400 R09: ffffed00374e4eb2 [ 35.744453] R10: ffffed00374e4eb4 R11: ffff8801ba7275a7 R12: 0000000000000000 [ 35.751751] R13: ffff8801ce48d500 R14: ffff8801bb55f840 R15: 0000000000000000 [ 35.759039] FS: 0000000001231880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.767281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.773177] CR2: 00000000006cf090 CR3: 00000001baf94000 CR4: 00000000001406e0 [ 35.780466] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.787758] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.795050] Kernel panic - not syncing: Fatal exception [ 35.800769] Dumping ftrace buffer: [ 35.804293] (ftrace buffer empty) [ 35.807983] Kernel Offset: disabled [ 35.811586] Rebooting in 86400 seconds..