[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.084594] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.420115] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.747103] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.552786] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 27.012512] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 32.385045] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 32.485687] kasan: CONFIG_KASAN_INLINE enabled [ 32.490538] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.503320] Dumping ftrace buffer: [ 32.506822] (ftrace buffer empty) [ 32.510496] Modules linked in: [ 32.513762] CPU: 0 PID: 3322 Comm: syzkaller974879 Not tainted 4.4.107-g610c835 #12 [ 32.521517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.530837] task: ffff8800b55b4740 task.stack: ffff8801cf9f8000 [ 32.536854] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.545085] RSP: 0018:ffff8801cf9ffab0 EFLAGS: 00010a07 [ 32.550498] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 32.557730] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.564964] RBP: ffff8801cf9ffac0 R08: 0000000000000001 R09: 0000000000000000 [ 32.572197] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.579432] R13: 0000000000000020 R14: ffff8801d0578000 R15: dffffc0000000000 [ 32.586666] FS: 0000000001964880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.594856] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.600702] CR2: 0000000020001000 CR3: 00000001d5199000 CR4: 00000000001406f0 [ 32.607938] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.615180] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.622414] Stack: [ 32.624524] 0000000000000000 ffff8801d0578158 ffff8801cf9ffb20 ffffffff825b8cf1 [ 32.632463] ffff8801d0578170 ffffed003a0af02b ffffed003a0af02e ffff8801d0578168 [ 32.640409] dead4ead00000000 ffff8801d0578140 0000000000000000 0000000000000000 [ 32.648356] Call Trace: [ 32.650919] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.657373] [] sg_finish_rem_req+0x2b5/0x340 [ 32.663396] [] sg_new_read.isra.18+0x39/0x3c0 [ 32.669502] [] ? sg_get_rq_mark+0x142/0x190 [ 32.675435] [] sg_read+0x8c2/0x1490 [ 32.680680] [] ? __lock_is_held+0xa1/0xf0 [ 32.686457] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.693092] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 32.700072] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.706707] [] __vfs_read+0x103/0x440 [ 32.712127] [] ? vfs_iter_write+0x2d0/0x2d0 [ 32.718065] [] ? fsnotify+0x5ad/0xee0 [ 32.723477] [] ? fsnotify+0xee0/0xee0 [ 32.728896] [] ? avc_policy_seqno+0x9/0x20 [ 32.734745] [] ? selinux_file_permission+0x348/0x460 [ 32.741461] [] ? security_file_permission+0x89/0x1e0 [ 32.748179] [] ? rw_verify_area+0x100/0x2f0 [ 32.754121] [] vfs_read+0x123/0x3a0 [ 32.759360] [] SyS_read+0xd9/0x1b0 [ 32.764514] [] ? do_sendfile+0xd30/0xd30 [ 32.770186] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.776641] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 32.783186] 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 [ 32.809454] RIP [] __free_pages+0x21/0x90 [ 32.815328] RSP [ 32.819201] ---[ end trace 12ab2f49a90bff43 ]--- [ 32.823928] Kernel panic - not syncing: Fatal exception [ 32.829614] Dumping ftrace buffer: [ 32.833120] (ftrace buffer empty) [ 32.836803] Kernel Offset: disabled [ 32.840397] Rebooting in 86400 seconds..