[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 28.425224] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.447986] random: sshd: uninitialized urandom read (32 bytes read) [ 32.898949] random: sshd: uninitialized urandom read (32 bytes read) [ 33.955521] random: sshd: uninitialized urandom read (32 bytes read) [ 34.157255] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 39.758741] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.793448] BUG: unable to handle kernel NULL pointer dereference at 000000000000005d [ 42.801500] PGD 8000000197f62067 P4D 8000000197f62067 PUD 1c7cc3067 PMD 0 [ 42.808583] Oops: 0000 [#1] SMP PTI [ 42.812225] Dumping ftrace buffer: [ 42.815776] (ftrace buffer empty) [ 42.819491] Modules linked in: [ 42.822725] CPU: 0 PID: 4483 Comm: syz-executor713 Not tainted 4.17.0-rc5+ #102 [ 42.830878] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program executing program executing program executing program [ 42.840281] RIP: 0010:n_tty_set_termios+0x251/0x1aa0 [ 42.845397] RSP: 0018:ffff880197d3f7d0 EFLAGS: 00010246 [ 42.850788] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8801cdceba80 [ 42.858077] RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 42.865365] RBP: ffff880197d3f878 R08: 0000000001080020 R09: 0000000000000002 [ 42.872653] R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000005d [ 42.879940] R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000 executing program executing program [ 42.887243] FS: 00007fd72c25d700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 42.895490] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.901393] CR2: 000000000000005d CR3: 00000001a9104000 CR4: 00000000001406f0 [ 42.908685] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.915981] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.923261] Call Trace: [ 42.925893] ? n_tty_ioctl+0x5f0/0x5f0 [ 42.929817] tty_set_termios+0x15ab/0x1d90 [ 42.934118] set_termios+0xadb/0xb50 [ 42.937895] tty_mode_ioctl+0x10bc/0x13b0 [ 42.942088] ? kmsan_set_origin_inline+0x6b/0x120 [ 42.946968] ? __msan_poison_alloca+0x15c/0x1d0 [ 42.951699] n_tty_ioctl_helper+0x186/0xc20 [ 42.956053] n_tty_ioctl+0x2b3/0x5f0 [ 42.959812] ? tty_ioctl+0x235c/0x2ba0 [ 42.963742] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.969151] ? n_tty_write+0x1de0/0x1de0 [ 42.973257] tty_ioctl+0x24c9/0x2ba0 [ 42.977027] ? __x64_sys_ioctl+0x280/0x320 [ 42.981303] ? do_vfs_ioctl+0x160/0x2410 [ 42.985390] ? tty_do_resize+0x230/0x230 [ 42.989475] do_vfs_ioctl+0xaf8/0x2410 [ 42.993413] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 42.998801] ? __fget_light+0x6a3/0x700 [ 43.002806] ? security_file_ioctl+0x5e/0x1f0 [ 43.007351] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 43.012751] __x64_sys_ioctl+0x280/0x320 [ 43.016846] do_syscall_64+0x152/0x230 [ 43.020766] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.025979] RIP: 0033:0x445cf9 [ 43.029181] RSP: 002b:00007fd72c25cd18 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 43.036924] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445cf9 [ 43.044218] RDX: 0000000020000040 RSI: 0000000000005402 RDI: 0000000000000207 [ 43.051509] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 43.058798] R10: 0000000000000000 R11: 0000000000000297 R12: 6d74702f7665642f [ 43.066094] R13: 00007ffd8d118e1f R14: 00007fd72c25d9c0 R15: 0000000000000007 [ 43.073382] Code: e8 d5 37 f9 fc 4c 8b 6d b0 e9 fe 00 00 00 89 55 b0 89 cb e8 c2 37 f9 fc 48 8b 45 b8 4c 8d 60 5d 48 83 7d c8 00 0f 85 2e 0c 00 00 <45> 8a 3c 24 4c 89 e7 e8 43 7a 53 fd 44 8a 30 8b 02 89 d9 8b 55 [ 43.093161] RIP: n_tty_set_termios+0x251/0x1aa0 RSP: ffff880197d3f7d0 [ 43.099760] CR2: 000000000000005d [ 43.103453] ---[ end trace 8d45df83312d8540 ]--- [ 43.108269] Kernel panic - not syncing: Fatal exception [ 43.114162] Dumping ftrace buffer: [ 43.117698] (ftrace buffer empty) [ 43.121397] Kernel Offset: disabled [ 43.125020] Rebooting in 86400 seconds..