[ 15.697083] 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: [ 20.774791] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.025152] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.850274] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 22.010016] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 27.380652] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 27.472296] kasan: CONFIG_KASAN_INLINE enabled [ 27.476941] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.489758] Dumping ftrace buffer: [ 27.493270] (ftrace buffer empty) [ 27.496964] Modules linked in: [ 27.500238] CPU: 1 PID: 3321 Comm: syzkaller206472 Not tainted 4.4.107-g610c835 #4 [ 27.507907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.517237] task: ffff8801d2f0df00 task.stack: ffff8801cc270000 [ 27.523260] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.531483] RSP: 0018:ffff8801cc277a40 EFLAGS: 00010a07 [ 27.536897] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.544155] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.551390] RBP: ffff8801cc277a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.558631] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.565865] R13: 0000000000000020 R14: ffff8801d1710000 R15: dffffc0000000000 [ 27.573105] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008a4a840 [ 27.581306] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.587167] CR2: 0000000020001000 CR3: 00000001d140e000 CR4: 00000000001406e0 [ 27.594406] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.601650] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.608894] Stack: [ 27.611018] 0000000000000000 ffff8801d1710158 ffff8801cc277ab0 ffffffff825b8cf1 [ 27.618964] ffff8801d1710170 ffffed003a2e202b ffffed003a2e202e ffff8801d1710168 [ 27.626940] dead4ead00000000 ffff8801d1710140 0000000000000000 0000000000000000 [ 27.634888] Call Trace: [ 27.637446] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.643904] [] sg_finish_rem_req+0x2b5/0x340 [ 27.649927] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.656040] [] ? sg_get_rq_mark+0x142/0x190 [ 27.661981] [] sg_read+0x8c2/0x1490 [ 27.667233] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.674393] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.681026] [] ? __lock_is_held+0xa1/0xf0 [ 27.686796] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.693435] [] __vfs_read+0x103/0x440 [ 27.698851] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.704784] [] ? fsnotify+0x5ad/0xee0 [ 27.710197] [] ? fsnotify+0xee0/0xee0 [ 27.715613] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.721550] [] ? avc_policy_seqno+0x9/0x20 [ 27.727396] [] ? selinux_file_permission+0x348/0x460 [ 27.734112] [] ? security_file_permission+0x89/0x1e0 [ 27.740828] [] ? rw_verify_area+0x100/0x2f0 [ 27.746762] [] vfs_read+0x123/0x3a0 [ 27.752003] [] SyS_read+0xd9/0x1b0 [ 27.757161] [] ? do_sendfile+0xd30/0xd30 [ 27.762851] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.769048] [] ? do_sendfile+0xd30/0xd30 [ 27.775297] [] do_fast_syscall_32+0x314/0x890 [ 27.781411] [] sysenter_flags_fixed+0xd/0x17 [ 27.787433] 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 [ 27.813736] RIP [] __free_pages+0x21/0x90 [ 27.819616] RSP [ 27.823309] ---[ end trace c8e85b6d66f58ff6 ]--- [ 27.828045] Kernel panic - not syncing: Fatal exception [ 27.833807] Dumping ftrace buffer: [ 27.837314] (ftrace buffer empty) [ 27.840987] Kernel Offset: disabled [ 27.844578] Rebooting in 86400 seconds..