[ 16.746689] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 20.421995] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.855595] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.700096] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 21.876625] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 27.254112] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program [ 27.346131] kasan: CONFIG_KASAN_INLINE enabled [ 27.350550] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.363356] Dumping ftrace buffer: [ 27.366865] (ftrace buffer empty) [ 27.370540] Modules linked in: [ 27.373810] CPU: 1 PID: 3325 Comm: syzkaller183065 Not tainted 4.4.111-gf851888 #16 [ 27.381565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.390884] task: ffff8801d1dedf00 task.stack: ffff8801d0880000 [ 27.396907] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.405138] RSP: 0018:ffff8801d0887970 EFLAGS: 00010a07 [ 27.410559] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 27.417802] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.425040] RBP: ffff8801d0887980 R08: 0000000000000001 R09: 0000000000000000 [ 27.432275] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.439515] R13: 0000000000000020 R14: ffff8801d1348000 R15: dffffc0000000000 [ 27.446751] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009167840 [ 27.454947] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.460801] CR2: 0000000020ef0fe0 CR3: 00000001d4db6000 CR4: 0000000000160670 [ 27.468060] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.475310] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.482552] Stack: [ 27.484666] 0000000000000000 ffff8801d1348158 ffff8801d08879e0 ffffffff825b9ec1 [ 27.492615] ffff8801d1348170 ffffed003a26902b ffffed003a26902e ffff8801d1348168 [ 27.500564] dead4ead00000000 ffff8801d1348140 0000000000000000 0000000000000000 [ 27.508525] Call Trace: [ 27.511081] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.517544] [] sg_finish_rem_req+0x2b5/0x340 [ 27.523567] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.529676] [] ? sg_get_rq_mark+0x142/0x190 [ 27.535619] [] sg_read+0x8c2/0x1490 [ 27.540861] [] ? do_page_fault+0x27/0x30 [ 27.546546] [] ? page_fault+0x28/0x30 [ 27.551963] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.558598] [] ? fsnotify+0xee0/0xee0 [ 27.564015] [] ? avc_policy_seqno+0x9/0x20 [ 27.569866] [] do_loop_readv_writev+0x141/0x1e0 [ 27.576156] [] ? security_file_permission+0x89/0x1e0 [ 27.582884] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.589515] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.596149] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.602605] [] ? vfs_writev+0xb0/0xb0 [ 27.608025] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.613974] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.620088] [] compat_readv+0xd9/0x140 [ 27.625598] [] compat_SyS_readv+0xd8/0x1b0 [ 27.631450] [] ? SyS_pwritev+0x230/0x230 [ 27.637124] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.643320] [] ? SyS_pwritev+0x230/0x230 [ 27.648994] [] do_fast_syscall_32+0x314/0x890 [ 27.655103] [] sysenter_flags_fixed+0xd/0x17 [ 27.661124] 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 [ 27.687565] RIP [] __free_pages+0x21/0x90 [ 27.693445] RSP [ 27.701057] ---[ end trace 65b722a6b518479c ]--- [ 27.706081] Kernel panic - not syncing: Fatal exception [ 27.711836] Dumping ftrace buffer: [ 27.715344] (ftrace buffer empty) [ 27.719019] Kernel Offset: disabled [ 27.722610] Rebooting in 86400 seconds..