[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.986038] 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: [ 19.612019] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 19.850732] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.638899] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) [ 33.812682] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. [ 39.558423] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 39.648570] kasan: CONFIG_KASAN_INLINE enabled [ 39.653020] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.665831] Dumping ftrace buffer: [ 39.669336] (ftrace buffer empty) [ 39.673014] Modules linked in: [ 39.676287] CPU: 1 PID: 3321 Comm: syzkaller255076 Not tainted 4.4.107-g610c835 #4 [ 39.683960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.693287] task: ffff8801d1880000 task.stack: ffff8801d0a38000 [ 39.699319] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 39.707552] RSP: 0018:ffff8801d0a3fa40 EFLAGS: 00010a07 [ 39.712966] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 39.720210] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 39.727451] RBP: ffff8801d0a3fa50 R08: 0000000000000001 R09: 0000000000000000 [ 39.734688] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 39.741923] R13: 0000000000000020 R14: ffff8800b80bc200 R15: dffffc0000000000 [ 39.749163] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008d24840 [ 39.757371] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.763222] CR2: 0000000020001000 CR3: 00000001d0d94000 CR4: 00000000001406e0 [ 39.770461] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.777700] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.784936] Stack: [ 39.787050] 0000000000000000 ffff8800b80bc358 ffff8801d0a3fab0 ffffffff825b8cf1 [ 39.795005] ffff8800b80bc370 ffffed001701786b ffffed001701786e ffff8800b80bc368 [ 39.802955] dead4ead00000000 ffff8800b80bc340 0000000000000000 0000000000000000 [ 39.810907] Call Trace: [ 39.813469] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 39.819926] [] sg_finish_rem_req+0x2b5/0x340 [ 39.825952] [] sg_new_read.isra.18+0x39/0x3c0 [ 39.832064] [] ? sg_get_rq_mark+0x142/0x190 [ 39.838000] [] sg_read+0x8c2/0x1490 [ 39.843245] [] ? save_stack_trace+0x26/0x50 [ 39.849182] [] ? save_stack+0x43/0xd0 [ 39.854597] [] ? kasan_slab_free+0x72/0xc0 [ 39.860456] [] ? kmem_cache_free+0xc7/0x320 [ 39.866403] [] ? putname+0xee/0x130 [ 39.871645] [] ? compat_SyS_open+0x2a/0x40 [ 39.877496] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.884126] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 39.890931] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 39.897823] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.904455] [] __vfs_read+0x103/0x440 [ 39.909868] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 39.916777] [] ? vfs_iter_write+0x2d0/0x2d0 [ 39.922713] [] ? fsnotify+0x5ad/0xee0 [ 39.928131] [] ? fsnotify+0xee0/0xee0 [ 39.933549] [] ? avc_policy_seqno+0x9/0x20 [ 39.939398] [] ? selinux_file_permission+0x348/0x460 [ 39.946116] [] ? security_file_permission+0x89/0x1e0 [ 39.952835] [] ? rw_verify_area+0x100/0x2f0 [ 39.958771] [] vfs_read+0x123/0x3a0 [ 39.964013] [] SyS_read+0xd9/0x1b0 [ 39.969166] [] ? do_sendfile+0xd30/0xd30 [ 39.974845] [] ? vmacache_update+0xfe/0x130 [ 39.980783] [] ? do_fast_syscall_32+0xd7/0x890 [ 39.986979] [] ? do_sendfile+0xd30/0xd30 [ 39.992653] [] do_fast_syscall_32+0x314/0x890 [ 39.998766] [] sysenter_flags_fixed+0xd/0x17 [ 40.004788] 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 [ 40.031134] RIP [] __free_pages+0x21/0x90 [ 40.037013] RSP [ 40.041071] ---[ end trace 81d722c9f80f1b71 ]--- [ 40.045804] Kernel panic - not syncing: Fatal exception [ 40.051529] Dumping ftrace buffer: [ 40.055036] (ftrace buffer empty) [ 40.058719] Kernel Offset: disabled [ 40.062314] Rebooting in 86400 seconds..