[ 15.435344] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.113724] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.469632] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.227226] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) [ 36.931941] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 42.303985] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) executing program [ 42.393381] kasan: CONFIG_KASAN_INLINE enabled [ 42.398326] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.411135] Dumping ftrace buffer: [ 42.414644] (ftrace buffer empty) [ 42.418327] Modules linked in: [ 42.421602] CPU: 1 PID: 3326 Comm: syzkaller913809 Not tainted 4.4.107-g610c835 #12 [ 42.429365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.438689] task: ffff8801d2154740 task.stack: ffff8800b49a0000 [ 42.444710] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 42.452932] RSP: 0018:ffff8800b49a7ab0 EFLAGS: 00010a07 [ 42.458343] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 42.465578] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 42.472813] RBP: ffff8800b49a7ac0 R08: 0000000000000001 R09: 0000000000000000 [ 42.480050] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 42.487287] R13: 0000000000000020 R14: ffff8801d0804200 R15: dffffc0000000000 [ 42.494524] FS: 0000000002312880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 42.502716] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.508570] CR2: 000000000043e5a0 CR3: 00000000b3c8d000 CR4: 00000000001406e0 [ 42.515809] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.523047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.530281] Stack: [ 42.532392] 0000000000000000 ffff8801d0804358 ffff8800b49a7b20 ffffffff825b8cf1 [ 42.540348] ffff8801d0804370 ffffed003a10086b ffffed003a10086e ffff8801d0804368 [ 42.548297] dead4ead00000000 ffff8801d0804340 0000000000000000 0000000000000000 [ 42.556251] Call Trace: [ 42.558807] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 42.565264] [] sg_finish_rem_req+0x2b5/0x340 [ 42.571287] [] sg_new_read.isra.18+0x39/0x3c0 [ 42.577396] [] ? sg_get_rq_mark+0x142/0x190 [ 42.583333] [] sg_read+0x8c2/0x1490 [ 42.588575] [] ? save_stack_trace+0x26/0x50 [ 42.594515] [] ? save_stack+0x43/0xd0 [ 42.599928] [] ? kasan_slab_free+0x72/0xc0 [ 42.605777] [] ? kmem_cache_free+0xc7/0x320 [ 42.611716] [] ? do_sys_open+0x23a/0x4b0 [ 42.617394] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.624029] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 42.630834] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 42.637724] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.644354] [] __vfs_read+0x103/0x440 [ 42.649767] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 42.656655] [] ? vfs_iter_write+0x2d0/0x2d0 [ 42.662592] [] ? fsnotify+0x5ad/0xee0 [ 42.668007] [] ? fsnotify+0xee0/0xee0 [ 42.673422] [] ? avc_policy_seqno+0x9/0x20 [ 42.679280] [] ? selinux_file_permission+0x348/0x460 [ 42.686006] [] ? security_file_permission+0x89/0x1e0 [ 42.692724] [] ? rw_verify_area+0x100/0x2f0 [ 42.698659] [] vfs_read+0x123/0x3a0 [ 42.703898] [] SyS_read+0xd9/0x1b0 [ 42.709052] [] ? do_sendfile+0xd30/0xd30 [ 42.714735] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 42.721195] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 42.727737] 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 [ 42.753964] RIP [] __free_pages+0x21/0x90 [ 42.759841] RSP [ 42.763701] ---[ end trace 0dd67e617a38af21 ]--- [ 42.769039] Kernel panic - not syncing: Fatal exception [ 42.774778] Dumping ftrace buffer: [ 42.778289] (ftrace buffer empty) [ 42.781973] Kernel Offset: disabled [ 42.785564] Rebooting in 86400 seconds..