[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.536355] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.556806] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.942935] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.725948] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 23.674970] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 29.055180] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program [ 29.163088] kasan: CONFIG_KASAN_INLINE enabled [ 29.168314] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.181109] Dumping ftrace buffer: [ 29.184609] (ftrace buffer empty) [ 29.188284] Modules linked in: [ 29.191555] CPU: 1 PID: 3312 Comm: syzkaller867197 Not tainted 4.4.107-g610c835 #12 [ 29.199308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.208625] task: ffff8800b5b197c0 task.stack: ffff8801d0e68000 [ 29.214641] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.222861] RSP: 0018:ffff8801d0e6fab0 EFLAGS: 00010a07 [ 29.228274] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.235508] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.242741] RBP: ffff8801d0e6fac0 R08: 0000000000000001 R09: 0000000000000000 [ 29.249973] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.257209] R13: 0000000000000020 R14: ffff8801d1782100 R15: dffffc0000000000 [ 29.264443] FS: 0000000000c13880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.272632] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.278479] CR2: 000000000043e5a0 CR3: 00000001d2d7c000 CR4: 00000000001406e0 [ 29.285718] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.292953] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.300185] Stack: [ 29.302296] 0000000000000000 ffff8801d1782258 ffff8801d0e6fb20 ffffffff825b8cf1 [ 29.310238] ffff8801d1782270 ffffed003a2f044b ffffed003a2f044e ffff8801d1782268 [ 29.318177] dead4ead00000000 ffff8801d1782240 0000000000000000 0000000000000000 [ 29.326118] Call Trace: [ 29.328674] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.335132] [] sg_finish_rem_req+0x2b5/0x340 [ 29.341152] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.347261] [] ? sg_get_rq_mark+0x142/0x190 [ 29.353194] [] sg_read+0x8c2/0x1490 [ 29.358439] [] ? save_stack_trace+0x26/0x50 [ 29.364373] [] ? save_stack+0x43/0xd0 [ 29.369787] [] ? kasan_slab_free+0x72/0xc0 [ 29.375637] [] ? kmem_cache_free+0xc7/0x320 [ 29.381578] [] ? do_sys_open+0x23a/0x4b0 [ 29.387252] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.393882] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 29.400685] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.407576] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.414203] [] __vfs_read+0x103/0x440 [ 29.419618] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.426512] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.432444] [] ? fsnotify+0x5ad/0xee0 [ 29.437858] [] ? fsnotify+0xee0/0xee0 [ 29.443273] [] ? avc_policy_seqno+0x9/0x20 [ 29.449121] [] ? selinux_file_permission+0x348/0x460 [ 29.455838] [] ? security_file_permission+0x89/0x1e0 [ 29.462556] [] ? rw_verify_area+0x100/0x2f0 [ 29.468492] [] vfs_read+0x123/0x3a0 [ 29.473731] [] SyS_read+0xd9/0x1b0 [ 29.478885] [] ? do_sendfile+0xd30/0xd30 [ 29.484564] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.491023] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 29.497564] Code: 76 ae 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 29.523887] RIP [] __free_pages+0x21/0x90 [ 29.529759] RSP [ 29.533811] ---[ end trace 0ffdcac7256c2aa3 ]--- [ 29.539038] Kernel panic - not syncing: Fatal exception [ 29.544781] Dumping ftrace buffer: [ 29.548289] (ftrace buffer empty) [ 29.551964] Kernel Offset: disabled [ 29.555554] Rebooting in 86400 seconds..