[ 16.411834] 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: [ 20.398535] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.671423] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.523615] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 21.686853] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.15.218' (ECDSA) to the list of known hosts. [ 27.071441] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 27.163808] kasan: CONFIG_KASAN_INLINE enabled [ 27.168478] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.181299] Dumping ftrace buffer: [ 27.184806] (ftrace buffer empty) [ 27.188493] Modules linked in: [ 27.191765] CPU: 1 PID: 3314 Comm: syzkaller657230 Not tainted 4.4.107-g610c835 #4 [ 27.199433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.208754] task: ffff8801d2b8c740 task.stack: ffff8800b0fb0000 [ 27.214773] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.223002] RSP: 0018:ffff8800b0fb7a40 EFLAGS: 00010a07 [ 27.228416] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.235658] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.242892] RBP: ffff8800b0fb7a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.250133] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.257372] R13: 0000000000000020 R14: ffff8800b46a0000 R15: dffffc0000000000 [ 27.264607] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009d64840 [ 27.272798] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.278644] CR2: 0000000020001000 CR3: 00000000b0ed0000 CR4: 00000000001406e0 [ 27.285883] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.293117] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.300359] Stack: [ 27.302471] 0000000000000000 ffff8800b46a0158 ffff8800b0fb7ab0 ffffffff825b8cf1 [ 27.310420] ffff8800b46a0170 ffffed00168d402b ffffed00168d402e ffff8800b46a0168 [ 27.318360] dead4ead00000000 ffff8800b46a0140 0000000000000000 0000000000000000 [ 27.326308] Call Trace: [ 27.328866] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.335324] [] sg_finish_rem_req+0x2b5/0x340 [ 27.341349] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.347459] [] ? sg_get_rq_mark+0x142/0x190 [ 27.353394] [] sg_read+0x8c2/0x1490 [ 27.358638] [] ? save_stack_trace+0x26/0x50 [ 27.364582] [] ? save_stack+0x43/0xd0 [ 27.370006] [] ? kasan_slab_free+0x72/0xc0 [ 27.375859] [] ? kmem_cache_free+0xc7/0x320 [ 27.381809] [] ? putname+0xee/0x130 [ 27.387072] [] ? compat_SyS_open+0x2a/0x40 [ 27.392943] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.399598] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.406416] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.413310] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.419943] [] __vfs_read+0x103/0x440 [ 27.425362] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.432261] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.438198] [] ? fsnotify+0x5ad/0xee0 [ 27.443628] [] ? fsnotify+0xee0/0xee0 [ 27.449054] [] ? avc_policy_seqno+0x9/0x20 [ 27.454915] [] ? selinux_file_permission+0x348/0x460 [ 27.461641] [] ? security_file_permission+0x89/0x1e0 [ 27.468363] [] ? rw_verify_area+0x100/0x2f0 [ 27.474300] [] vfs_read+0x123/0x3a0 [ 27.479541] [] SyS_read+0xd9/0x1b0 [ 27.484701] [] ? do_sendfile+0xd30/0xd30 [ 27.490388] [] ? vmacache_update+0xfe/0x130 [ 27.496325] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.502522] [] ? do_sendfile+0xd30/0xd30 [ 27.508198] [] do_fast_syscall_32+0x314/0x890 [ 27.514315] [] sysenter_flags_fixed+0xd/0x17 [ 27.520335] 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 [ 27.546636] RIP [] __free_pages+0x21/0x90 [ 27.552520] RSP [ 27.556580] ---[ end trace d55848c40a57f339 ]--- [ 27.561323] Kernel panic - not syncing: Fatal exception [ 27.567129] Dumping ftrace buffer: [ 27.570637] (ftrace buffer empty) [ 27.574317] Kernel Offset: disabled [ 27.577909] Rebooting in 86400 seconds..