[ 16.838009] 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: [ 20.068901] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.479936] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.395620] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 21.560396] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.15.230' (ECDSA) to the list of known hosts. [ 26.951809] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 27.095426] kasan: CONFIG_KASAN_INLINE enabled [ 27.100386] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.113293] Dumping ftrace buffer: [ 27.116795] (ftrace buffer empty) [ 27.120471] Modules linked in: [ 27.123738] CPU: 0 PID: 3329 Comm: syzkaller215190 Not tainted 4.4.111-g7902639 #18 [ 27.131492] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.140810] task: ffff8800b4d98000 task.stack: ffff8800b4138000 [ 27.146827] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.155047] RSP: 0018:ffff8800b413f970 EFLAGS: 00010a07 [ 27.160459] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 27.167692] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.174925] RBP: ffff8800b413f980 R08: 0000000000000001 R09: 0000000000000000 [ 27.182158] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.189391] R13: 0000000000000020 R14: ffff8801d056c200 R15: dffffc0000000000 [ 27.196623] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008e55840 [ 27.204810] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.210655] CR2: 0000000020ef0fe0 CR3: 00000000b4470000 CR4: 0000000000160670 [ 27.217891] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.225125] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.232356] Stack: [ 27.234466] 0000000000000000 ffff8801d056c358 ffff8800b413f9e0 ffffffff825b9ee1 [ 27.242410] ffff8801d056c370 ffffed003a0ad86b ffffed003a0ad86e ffff8801d056c368 [ 27.250351] dead4ead00000000 ffff8801d056c340 0000000000000000 0000000000000000 [ 27.258291] Call Trace: [ 27.260844] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.267299] [] sg_finish_rem_req+0x2b5/0x340 [ 27.273321] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.279430] [] ? sg_get_rq_mark+0x142/0x190 [ 27.285363] [] sg_read+0x8c2/0x1490 [ 27.290603] [] ? do_page_fault+0x27/0x30 [ 27.296277] [] ? page_fault+0x28/0x30 [ 27.301692] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.308320] [] ? fsnotify+0xee0/0xee0 [ 27.313734] [] ? avc_policy_seqno+0x9/0x20 [ 27.319581] [] do_loop_readv_writev+0x141/0x1e0 [ 27.325860] [] ? security_file_permission+0x89/0x1e0 [ 27.332576] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.339205] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.345836] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.352291] [] ? vfs_writev+0xb0/0xb0 [ 27.357703] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.363636] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.369745] [] compat_readv+0xd9/0x140 [ 27.375246] [] compat_SyS_readv+0xd8/0x1b0 [ 27.381100] [] ? SyS_pwritev+0x230/0x230 [ 27.386779] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.393063] [] ? SyS_pwritev+0x230/0x230 [ 27.398739] [] do_fast_syscall_32+0x314/0x890 [ 27.404860] [] sysenter_flags_fixed+0xd/0x17 [ 27.410880] Code: 96 a4 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 [ 27.437160] RIP [] __free_pages+0x21/0x90 [ 27.443032] RSP [ 27.446712] ---[ end trace 782dcfa324c69962 ]--- [ 27.451552] Kernel panic - not syncing: Fatal exception [ 27.457274] Dumping ftrace buffer: [ 27.460779] (ftrace buffer empty) [ 27.464454] Kernel Offset: disabled [ 27.468044] Rebooting in 86400 seconds..