[ 15.990060] 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: [ 21.008999] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.228117] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.003779] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 29.629010] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) Warning: Permanently added '10.128.15.230' (ECDSA) to the list of known hosts. [ 35.000497] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) executing program [ 35.091824] kasan: CONFIG_KASAN_INLINE enabled [ 35.096714] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 35.109530] Dumping ftrace buffer: [ 35.113055] (ftrace buffer empty) [ 35.116740] Modules linked in: [ 35.120040] CPU: 1 PID: 3323 Comm: syzkaller100165 Not tainted 4.4.107-g610c835 #4 [ 35.127740] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.137078] task: ffff8800b530af80 task.stack: ffff8801d1040000 [ 35.143105] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 35.151336] RSP: 0018:ffff8801d1047a40 EFLAGS: 00010a07 [ 35.156753] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 35.163991] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 35.171228] RBP: ffff8801d1047a50 R08: 0000000000000001 R09: 0000000000000000 [ 35.178466] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 35.185705] R13: 0000000000000020 R14: ffff8800b487c200 R15: dffffc0000000000 [ 35.192949] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000833c840 [ 35.201166] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.207022] CR2: 0000000020001000 CR3: 00000001d1135000 CR4: 00000000001406e0 [ 35.214263] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.221506] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.228748] Stack: [ 35.230864] 0000000000000000 ffff8800b487c358 ffff8801d1047ab0 ffffffff825b8cf1 [ 35.238854] ffff8800b487c370 ffffed001690f86b ffffed001690f86e ffff8800b487c368 [ 35.246823] dead4ead00000000 ffff8800b487c340 0000000000000000 0000000000000000 [ 35.254791] Call Trace: [ 35.257354] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 35.263815] [] sg_finish_rem_req+0x2b5/0x340 [ 35.269845] [] sg_new_read.isra.18+0x39/0x3c0 [ 35.275960] [] ? sg_get_rq_mark+0x142/0x190 [ 35.281916] [] sg_read+0x8c2/0x1490 [ 35.287174] [] ? save_stack_trace+0x26/0x50 [ 35.293117] [] ? save_stack+0x43/0xd0 [ 35.298540] [] ? kasan_slab_free+0x72/0xc0 [ 35.304394] [] ? kmem_cache_free+0xc7/0x320 [ 35.310333] [] ? putname+0xee/0x130 [ 35.315594] [] ? compat_SyS_open+0x2a/0x40 [ 35.321452] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.328087] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 35.334901] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 35.341804] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.348450] [] __vfs_read+0x103/0x440 [ 35.353880] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.360794] [] ? vfs_iter_write+0x2d0/0x2d0 [ 35.366737] [] ? fsnotify+0x5ad/0xee0 [ 35.372163] [] ? fsnotify+0xee0/0xee0 [ 35.377606] [] ? avc_policy_seqno+0x9/0x20 [ 35.383459] [] ? selinux_file_permission+0x348/0x460 [ 35.390182] [] ? security_file_permission+0x89/0x1e0 [ 35.396905] [] ? rw_verify_area+0x100/0x2f0 [ 35.402842] [] vfs_read+0x123/0x3a0 [ 35.408085] [] SyS_read+0xd9/0x1b0 [ 35.413241] [] ? do_sendfile+0xd30/0xd30 [ 35.418924] [] ? vmacache_update+0xfe/0x130 [ 35.424873] [] ? do_fast_syscall_32+0xd7/0x890 [ 35.431075] [] ? do_sendfile+0xd30/0xd30 [ 35.436756] [] do_fast_syscall_32+0x314/0x890 [ 35.442871] [] sysenter_flags_fixed+0xd/0x17 [ 35.448894] 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 [ 35.475230] RIP [] __free_pages+0x21/0x90 [ 35.481111] RSP [ 35.484922] ---[ end trace bfe84075a3a2e6a9 ]--- [ 35.489654] Kernel panic - not syncing: Fatal exception [ 35.495339] Dumping ftrace buffer: [ 35.498856] (ftrace buffer empty) [ 35.502539] Kernel Offset: disabled [ 35.506133] Rebooting in 86400 seconds..