[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.115920] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.278741] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.612223] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.382021] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 27.072146] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.15.210' (ECDSA) to the list of known hosts. [ 32.473198] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) executing program [ 32.561322] kasan: CONFIG_KASAN_INLINE enabled [ 32.565733] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.578557] Dumping ftrace buffer: [ 32.582065] (ftrace buffer empty) [ 32.585742] Modules linked in: [ 32.589017] CPU: 1 PID: 3616 Comm: syzkaller288220 Not tainted 4.4.115-g0e9bcc1 #11 [ 32.596775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.606105] task: ffff8801cd86b000 task.stack: ffff8801cc7f0000 [ 32.612130] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.620360] RSP: 0018:ffff8801cc7f7ab0 EFLAGS: 00010a07 [ 32.625774] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 32.633019] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.640258] RBP: ffff8801cc7f7ac0 R08: 0000000000000000 R09: 0000000000000000 [ 32.647495] R10: 0000000000000000 R11: 1ffff100398fef36 R12: 0000000000000004 [ 32.654733] R13: 0000000000000020 R14: ffff8800b0e88000 R15: dffffc0000000000 [ 32.661971] FS: 0000000002409880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.670165] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.676017] CR2: 0000000020a2f000 CR3: 00000000b1366000 CR4: 0000000000160670 [ 32.683256] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.690491] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.697726] Stack: [ 32.699840] 0000000000000000 ffff8800b0e88158 ffff8801cc7f7b20 ffffffff825b8751 [ 32.707806] ffff8800b0e88170 ffffed00161d102b ffffed00161d102e ffff8800b0e88168 [ 32.715766] dead4ead00000000 ffff8800b0e88140 0000000000000000 0000000000000000 [ 32.723725] Call Trace: [ 32.726281] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.732738] [] sg_finish_rem_req+0x2b5/0x340 [ 32.738761] [] sg_new_read.isra.18+0x39/0x3c0 [ 32.744870] [] ? sg_get_rq_mark+0x142/0x190 [ 32.750810] [] sg_read+0x8bc/0x1490 [ 32.756468] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.763104] [] ? __lru_cache_add+0x164/0x240 [ 32.769133] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 32.776112] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.782753] [] __vfs_read+0x103/0x440 [ 32.788172] [] ? vfs_iter_write+0x2d0/0x2d0 [ 32.794112] [] ? fsnotify+0x5ad/0xee0 [ 32.799529] [] ? fsnotify+0xee0/0xee0 [ 32.804948] [] ? avc_policy_seqno+0x9/0x20 [ 32.810805] [] ? selinux_file_permission+0x348/0x460 [ 32.817522] [] ? security_file_permission+0x89/0x1e0 [ 32.824239] [] ? rw_verify_area+0x100/0x2f0 [ 32.830177] [] vfs_read+0x123/0x3a0 [ 32.835417] [] SyS_read+0xd9/0x1b0 [ 32.840573] [] ? do_sendfile+0xd30/0xd30 [ 32.846258] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.852719] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 32.859263] Code: c6 9f 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 [ 32.885803] RIP [] __free_pages+0x21/0x90 [ 32.891685] RSP [ 32.895646] ---[ end trace 5a9aea90f8b7193a ]--- [ 32.901202] Kernel panic - not syncing: Fatal exception [ 32.906918] Dumping ftrace buffer: [ 32.910428] (ftrace buffer empty) [ 32.914106] Kernel Offset: disabled [ 32.917703] Rebooting in 86400 seconds..