[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.077883] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.719245] random: sshd: uninitialized urandom read (32 bytes read) [ 29.161794] random: sshd: uninitialized urandom read (32 bytes read) [ 29.744919] random: sshd: uninitialized urandom read (32 bytes read) [ 29.924620] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 35.555386] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 35.655625] usb usb1: usbfs: interface 0 claimed by hub while 'syz-executor195' sets config #0 [ 35.668648] usb usb1: usbfs: process 4668 (syz-executor195) did not claim interface 0 before use [ 35.683678] kasan: CONFIG_KASAN_INLINE enabled [ 35.688384] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.695804] general protection fault: 0000 [#1] SMP KASAN [ 35.701350] CPU: 1 PID: 4669 Comm: syz-executor195 Not tainted 4.19.0-rc1-next-20180830+ #52 [ 35.709914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.719261] RIP: 0010:usb_find_alt_setting+0x38/0x310 [ 35.724717] Code: 89 fb 48 83 ec 10 48 89 7d c8 89 55 d4 89 75 d0 e8 bd 3b 09 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 [ 35.743721] RSP: 0018:ffff8801ca4274a8 EFLAGS: 00010247 [ 35.749236] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8478b4e9 [ 35.756496] RDX: 0000000000000000 RSI: ffffffff84738c33 RDI: 0000000000000004 [ 35.763758] RBP: ffff8801ca4274e0 R08: ffff8801b7bf2580 R09: ffffed0039484eb2 [ 35.771037] R10: ffffed0039484eb4 R11: ffff8801ca4275a7 R12: 0000000000000000 [ 35.778291] R13: ffff8801ce4bd500 R14: ffff8801b8665340 R15: 0000000000000000 [ 35.785548] FS: 0000000001b3d880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.793763] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.799633] CR2: 00000000006cf090 CR3: 00000001b86b1000 CR4: 00000000001406e0 [ 35.806895] Call Trace: [ 35.809494] check_ctrlrecip+0x1e6/0x320 [ 35.813547] ? _copy_from_user+0xdf/0x150 [ 35.817716] proc_control+0x151/0xef0 [ 35.821504] ? mark_held_locks+0x160/0x160 [ 35.825737] ? proc_bulk+0xaa0/0xaa0 [ 35.829441] ? lock_downgrade+0x8f0/0x8f0 [ 35.833588] usbdev_do_ioctl+0x1eb4/0x3b30 [ 35.837952] ? processcompl_compat+0x680/0x680 [ 35.842520] ? mntput_no_expire+0x1ea/0xc10 [ 35.846830] ? __lock_acquire+0x7fc/0x5020 [ 35.851187] ? graph_lock+0x170/0x170 [ 35.854983] ? dput.part.26+0x276/0x7a0 [ 35.858953] ? find_held_lock+0x36/0x1c0 [ 35.863024] ? lock_downgrade+0x8f0/0x8f0 [ 35.867160] ? kasan_check_read+0x11/0x20 [ 35.871290] ? rcu_is_watching+0x8c/0x150 [ 35.875428] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 35.880089] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 35.884748] ? is_bpf_text_address+0xd7/0x170 [ 35.889238] ? kernel_text_address+0x79/0xf0 [ 35.893641] ? __kernel_text_address+0xd/0x40 [ 35.898149] ? unwind_get_return_address+0x61/0xa0 [ 35.903079] ? __save_stack_trace+0x8d/0xf0 [ 35.907398] ? save_stack+0xa9/0xd0 [ 35.911015] ? save_stack+0x43/0xd0 [ 35.914625] ? __kasan_slab_free+0x11a/0x170 [ 35.919019] ? kasan_slab_free+0xe/0x10 [ 35.922982] ? kmem_cache_free+0x86/0x280 [ 35.927157] ? putname+0xf2/0x130 [ 35.930606] ? do_sys_open+0x569/0x720 [ 35.934481] ? __x64_sys_open+0x7e/0xc0 [ 35.938441] ? do_syscall_64+0x1b9/0x820 [ 35.942535] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.947935] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.952332] ? kasan_check_read+0x11/0x20 [ 35.956554] ? do_raw_spin_unlock+0xa7/0x2f0 [ 35.960955] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.965349] ? kasan_check_write+0x14/0x20 [ 35.969565] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.973963] usbdev_ioctl+0x25/0x30 [ 35.977642] ? usbdev_compat_ioctl+0x30/0x30 [ 35.982050] do_vfs_ioctl+0x1de/0x1720 [ 35.985932] ? kasan_check_read+0x11/0x20 [ 35.990071] ? rcu_is_watching+0x8c/0x150 [ 35.994199] ? trace_hardirqs_on+0xbd/0x2c0 [ 35.998509] ? ioctl_preallocate+0x300/0x300 [ 36.003058] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.008584] ? __fget_light+0x2f7/0x440 [ 36.012543] ? putname+0xf2/0x130 [ 36.015995] ? fget_raw+0x20/0x20 [ 36.019438] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.024442] ? kmem_cache_free+0x246/0x280 [ 36.028673] ? do_syscall_64+0x9a/0x820 [ 36.032633] ? do_syscall_64+0x9a/0x820 [ 36.036598] ? lockdep_hardirqs_on+0x421/0x5c0 [ 36.041163] ? security_file_ioctl+0x94/0xc0 [ 36.045561] ksys_ioctl+0xa9/0xd0 [ 36.049004] __x64_sys_ioctl+0x73/0xb0 [ 36.052886] do_syscall_64+0x1b9/0x820 [ 36.056767] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.062122] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.067036] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.071922] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 36.076935] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.081973] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.086977] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.091838] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.097010] RIP: 0033:0x444b19 [ 36.100188] 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 [ 36.119121] RSP: 002b:00007ffc16639eb8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 36.126822] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444b19 [ 36.134078] RDX: 0000000020000280 RSI: 00000000c0185500 RDI: 0000000000000005 [ 36.141335] RBP: 0000000000000000 R08: 00000000004002e0 R09: 00000000004002e0 [ 36.148604] R10: 000000000000000f R11: 0000000000000217 R12: 0000000000008b33 [ 36.155902] R13: 0000000000401f10 R14: 0000000000000000 R15: 0000000000000000 [ 36.163163] Modules linked in: [ 36.166343] Dumping ftrace buffer: [ 36.169862] (ftrace buffer empty) [ 36.173749] ---[ end trace 35be34bb5283c82c ]--- [ 36.178547] RIP: 0010:usb_find_alt_setting+0x38/0x310 [ 36.183772] Code: 89 fb 48 83 ec 10 48 89 7d c8 89 55 d4 89 75 d0 e8 bd 3b 09 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 [ 36.202710] RSP: 0018:ffff8801ca4274a8 EFLAGS: 00010247 [ 36.208175] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8478b4e9 [ 36.215604] RDX: 0000000000000000 RSI: ffffffff84738c33 RDI: 0000000000000004 [ 36.222906] RBP: ffff8801ca4274e0 R08: ffff8801b7bf2580 R09: ffffed0039484eb2 [ 36.230199] R10: ffffed0039484eb4 R11: ffff8801ca4275a7 R12: 0000000000000000 [ 36.237499] R13: ffff8801ce4bd500 R14: ffff8801b8665340 R15: 0000000000000000 [ 36.244779] FS: 0000000001b3d880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 36.253148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.259043] CR2: 00000000006cf090 CR3: 00000001b86b1000 CR4: 00000000001406e0 [ 36.266364] Kernel panic - not syncing: Fatal exception [ 36.272055] Dumping ftrace buffer: [ 36.275582] (ftrace buffer empty) [ 36.279278] Kernel Offset: disabled [ 36.282893] Rebooting in 86400 seconds..