[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.187279] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.171465] random: sshd: uninitialized urandom read (32 bytes read) [ 28.509651] random: sshd: uninitialized urandom read (32 bytes read) [ 29.103452] random: sshd: uninitialized urandom read (32 bytes read) [ 32.524800] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 38.208808] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.314615] kasan: CONFIG_KASAN_INLINE enabled [ 38.319297] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.326695] general protection fault: 0000 [#1] SMP KASAN [ 38.332236] CPU: 0 PID: 4750 Comm: syz-executor794 Not tainted 4.19.0-rc1-next-20180830+ #52 [ 38.340787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.350156] RIP: 0010:ubifs_mount+0x1a0/0x66f0 [ 38.354719] Code: 49 89 c7 48 89 c6 e8 5f 10 0f ff 49 81 ff 00 f0 ff ff 0f 86 91 03 00 00 e8 1d 0f 0f ff 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 08 84 c0 0f 85 1e 19 00 00 44 0f b6 2b bf [ 38.373601] RSP: 0018:ffff8801d8637660 EFLAGS: 00010246 [ 38.378959] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff826db8c1 [ 38.386211] RDX: 0000000000000000 RSI: ffffffff826db8d3 RDI: 0000000000000007 [ 38.393469] RBP: ffff8801d8637b88 R08: ffff8801d876c680 R09: ffffed003b6046de [ 38.400718] R10: ffffed003b6046de R11: ffff8801db0236f3 R12: ffff8801d8637b60 [ 38.407969] R13: dffffc0000000000 R14: ffff8801cae55948 R15: ffffffffffffffea [ 38.415221] FS: 00000000016fa880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 38.423536] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.429505] CR2: 0000000020000040 CR3: 00000001b4516000 CR4: 00000000001406f0 [ 38.436755] Call Trace: [ 38.439328] ? __kernel_text_address+0xd/0x40 [ 38.443809] ? unwind_get_return_address+0x61/0xa0 [ 38.448835] ? __save_stack_trace+0x8d/0xf0 [ 38.453145] ? ubifs_iget+0x1bf0/0x1bf0 [ 38.457103] ? save_stack+0x43/0xd0 [ 38.460709] ? kasan_kmalloc+0xc4/0xe0 [ 38.464576] ? __kmalloc_track_caller+0x14a/0x720 [ 38.469462] ? krealloc+0x65/0xb0 [ 38.472909] ? apparmor_fs_context_parse_param+0x1dd/0x490 [ 38.478531] ? security_fs_context_parse_param+0x54/0xb0 [ 38.484012] ? vfs_parse_fs_param+0x127/0x2c0 [ 38.488500] ? vfs_parse_fs_string+0x1d5/0x2b0 [ 38.493065] ? do_mount+0x658/0x1e30 [ 38.496802] ? ksys_mount+0x12d/0x140 [ 38.500590] ? __x64_sys_mount+0xbe/0x150 [ 38.504784] ? do_syscall_64+0x1b9/0x820 [ 38.508837] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.514197] ? find_held_lock+0x36/0x1c0 [ 38.518244] ? __kmalloc_track_caller+0x26e/0x720 [ 38.523071] ? kasan_check_read+0x11/0x20 [ 38.527217] ? rcu_is_watching+0x8c/0x150 [ 38.531349] ? trace_hardirqs_on+0xbd/0x2c0 [ 38.535648] ? rcu_pm_notify+0xc0/0xc0 [ 38.539519] ? kasan_check_read+0x11/0x20 [ 38.543648] ? rcu_is_watching+0x8c/0x150 [ 38.547794] ? rcu_pm_notify+0xc0/0xc0 [ 38.551664] ? krealloc+0x7a/0xb0 [ 38.555122] ? rcu_read_lock_sched_held+0x108/0x120 [ 38.560178] ? kfree+0x1d7/0x210 [ 38.563533] ? kasan_check_read+0x11/0x20 [ 38.567663] ? rcu_is_watching+0x8c/0x150 [ 38.571792] ? rcu_pm_notify+0xc0/0xc0 [ 38.575668] ? vfs_parse_fs_string+0x1f8/0x2b0 [ 38.580323] ? rcu_read_lock_sched_held+0x108/0x120 [ 38.585508] ? kfree+0x1d7/0x210 [ 38.588874] ? ubifs_iget+0x1bf0/0x1bf0 [ 38.592858] legacy_get_tree+0x131/0x460 [ 38.596910] vfs_get_tree+0x1cb/0x5c0 [ 38.600703] do_mount+0x6f9/0x1e30 [ 38.604223] ? lock_release+0x9f0/0x9f0 [ 38.608179] ? copy_mount_string+0x40/0x40 [ 38.612422] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.617945] ? _copy_from_user+0xdf/0x150 [ 38.622092] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.627614] ? copy_mount_options+0x285/0x380 [ 38.632103] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.637626] ksys_mount+0x12d/0x140 [ 38.641236] __x64_sys_mount+0xbe/0x150 [ 38.645193] do_syscall_64+0x1b9/0x820 [ 38.649078] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.654441] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.659351] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.664176] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 38.669421] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.674426] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.680208] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.685208] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.690036] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.695205] RIP: 0033:0x440029 [ 38.698393] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.717289] RSP: 002b:00007fff912a7cb8 EFLAGS: 00000207 ORIG_RAX: 00000000000000a5 [ 38.724994] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 38.732244] RDX: 0000000020000040 RSI: 0000000020d78000 RDI: 0000000020fb6000 [ 38.739538] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 38.746796] R10: 0000000000000000 R11: 0000000000000207 R12: 00000000004018b0 [ 38.754049] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 38.761300] Modules linked in: [ 38.764534] Dumping ftrace buffer: [ 38.768049] (ftrace buffer empty) [ 38.771842] ---[ end trace 9dcb736f966f3063 ]--- [ 38.776628] RIP: 0010:ubifs_mount+0x1a0/0x66f0 [ 38.781354] Code: 49 89 c7 48 89 c6 e8 5f 10 0f ff 49 81 ff 00 f0 ff ff 0f 86 91 03 00 00 e8 1d 0f 0f ff 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 08 84 c0 0f 85 1e 19 00 00 44 0f b6 2b bf [ 38.800492] RSP: 0018:ffff8801d8637660 EFLAGS: 00010246 [ 38.805879] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff826db8c1 [ 38.813171] RDX: 0000000000000000 RSI: ffffffff826db8d3 RDI: 0000000000000007 [ 38.820460] RBP: ffff8801d8637b88 R08: ffff8801d876c680 R09: ffffed003b6046de [ 38.827781] R10: ffffed003b6046de R11: ffff8801db0236f3 R12: ffff8801d8637b60 [ 38.835073] R13: dffffc0000000000 R14: ffff8801cae55948 R15: ffffffffffffffea [ 38.842359] FS: 00000000016fa880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 38.850600] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.856514] CR2: 0000000020000040 CR3: 00000001b4516000 CR4: 00000000001406f0 [ 38.863822] Kernel panic - not syncing: Fatal exception [ 38.869511] Dumping ftrace buffer: [ 38.873113] (ftrace buffer empty) [ 38.876811] Kernel Offset: disabled [ 38.880516] Rebooting in 86400 seconds..