[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.609174] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.947368] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.289577] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.265153] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) [ 27.360463] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. executing program [ 47.939581] kasan: CONFIG_KASAN_INLINE enabled [ 47.943989] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.956817] Dumping ftrace buffer: [ 47.960334] (ftrace buffer empty) [ 47.964011] Modules linked in: [ 47.967287] CPU: 1 PID: 3646 Comm: syzkaller249636 Not tainted 4.4.125-g38f41ec #63 [ 47.975043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.984369] task: ffff8801cdece000 task.stack: ffff8801d2850000 [ 47.990397] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 47.998625] RSP: 0018:ffff8801d2857aa8 EFLAGS: 00010a07 [ 48.004038] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb [ 48.011275] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 48.018515] RBP: ffff8801d2857ab8 R08: 0000000000000001 R09: 0000000000000000 [ 48.025761] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 48.033002] R13: 0000000000000020 R14: ffff8801cddb2100 R15: dffffc0000000000 [ 48.040245] FS: 000000000118c880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 48.048444] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.054297] CR2: 000000002012f000 CR3: 00000001cdc48000 CR4: 0000000000160670 [ 48.061538] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.068776] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.076011] Stack: [ 48.078129] 0000000000000000 ffff8801cddb2258 ffff8801d2857b18 ffffffff825bb221 [ 48.086090] ffff8801cddb2270 ffffed0039bb644b ffffed0039bb644e ffff8801cddb2268 [ 48.094048] dead4ead00000000 ffff8801cddb2240 0000000000000000 0000000000000000 [ 48.102003] Call Trace: [ 48.104568] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 48.111031] [] sg_finish_rem_req+0x2a6/0x320 [ 48.117059] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 48.123864] [] sg_new_read+0x3c/0x420 [ 48.129281] [] ? sg_get_rq_mark+0x142/0x190 [ 48.135220] [] sg_read+0x8cf/0x14d0 [ 48.140465] [] ? __lock_is_held+0xa1/0xf0 [ 48.146227] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 48.152863] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 48.159842] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 48.166474] [] __vfs_read+0x103/0x440 [ 48.171891] [] ? vfs_iter_write+0x2d0/0x2d0 [ 48.177831] [] ? fsnotify+0x5ad/0xee0 [ 48.183245] [] ? fsnotify+0xee0/0xee0 [ 48.188663] [] ? avc_policy_seqno+0x9/0x20 [ 48.194513] [] ? selinux_file_permission+0x348/0x460 [ 48.201234] [] ? security_file_permission+0x89/0x1e0 [ 48.207951] [] ? rw_verify_area+0x100/0x2f0 [ 48.213904] [] vfs_read+0x123/0x3a0 [ 48.219154] [] SyS_read+0xd9/0x1b0 [ 48.224320] [] ? do_sendfile+0xd30/0xd30 [ 48.230008] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 48.236472] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 48.243015] Code: c6 a0 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 [ 48.269523] RIP [] __free_pages+0x21/0x90 [ 48.275406] RSP [ 48.279263] ---[ end trace b477072893c8f04f ]--- [ 48.284003] Kernel panic - not syncing: Fatal exception [ 48.289730] Dumping ftrace buffer: [ 48.293244] (ftrace buffer empty) [ 48.296922] Kernel Offset: disabled [ 48.300513] Rebooting in 86400 seconds..