[ 16.979524] 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: [ 20.805690] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.054684] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.885755] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 22.044306] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.216' (ECDSA) to the list of known hosts. [ 27.421099] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) executing program [ 27.523976] kasan: CONFIG_KASAN_INLINE enabled [ 27.528845] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.541660] Dumping ftrace buffer: [ 27.545176] (ftrace buffer empty) [ 27.548855] Modules linked in: [ 27.552141] CPU: 1 PID: 3331 Comm: syzkaller339566 Not tainted 4.4.107-g610c835 #4 [ 27.559813] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.569137] task: ffff8800b5010000 task.stack: ffff8801d0a68000 [ 27.575158] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.583396] RSP: 0018:ffff8801d0a6fa40 EFLAGS: 00010a07 [ 27.588808] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.596045] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.603282] RBP: ffff8801d0a6fa50 R08: 0000000000000001 R09: 0000000000000000 [ 27.610523] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.617771] R13: 0000000000000020 R14: ffff8800b500c200 R15: dffffc0000000000 [ 27.625010] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008567840 [ 27.633210] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.639059] CR2: 0000000020001000 CR3: 00000001cd308000 CR4: 00000000001406e0 [ 27.646298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.653536] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.660772] Stack: [ 27.662887] 0000000000000000 ffff8800b500c358 ffff8801d0a6fab0 ffffffff825b8cf1 [ 27.670840] ffff8800b500c370 ffffed0016a0186b ffffed0016a0186e ffff8800b500c368 [ 27.678801] dead4ead00000000 ffff8800b500c340 0000000000000000 0000000000000000 [ 27.686748] Call Trace: [ 27.689309] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.695777] [] sg_finish_rem_req+0x2b5/0x340 [ 27.701800] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.707910] [] ? sg_get_rq_mark+0x142/0x190 [ 27.713847] [] sg_read+0x8c2/0x1490 [ 27.719094] [] ? save_stack_trace+0x26/0x50 [ 27.725031] [] ? save_stack+0x43/0xd0 [ 27.730458] [] ? kasan_slab_free+0x72/0xc0 [ 27.736308] [] ? kmem_cache_free+0xc7/0x320 [ 27.742254] [] ? putname+0xee/0x130 [ 27.747508] [] ? compat_SyS_open+0x2a/0x40 [ 27.753363] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.759995] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.766806] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.773719] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.780356] [] __vfs_read+0x103/0x440 [ 27.785772] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.792664] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.798603] [] ? fsnotify+0x5ad/0xee0 [ 27.804018] [] ? fsnotify+0xee0/0xee0 [ 27.809447] [] ? avc_policy_seqno+0x9/0x20 [ 27.815295] [] ? selinux_file_permission+0x348/0x460 [ 27.822438] [] ? security_file_permission+0x89/0x1e0 [ 27.829163] [] ? rw_verify_area+0x100/0x2f0 [ 27.835102] [] vfs_read+0x123/0x3a0 [ 27.840353] [] SyS_read+0xd9/0x1b0 [ 27.845507] [] ? do_sendfile+0xd30/0xd30 [ 27.851194] [] ? vmacache_update+0xfe/0x130 [ 27.857132] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.863329] [] ? do_sendfile+0xd30/0xd30 [ 27.869008] [] do_fast_syscall_32+0x314/0x890 [ 27.875120] [] sysenter_flags_fixed+0xd/0x17 [ 27.881142] 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 [ 27.907586] RIP [] __free_pages+0x21/0x90 [ 27.913478] RSP [ 27.917456] ---[ end trace e6726dd9a65b9093 ]--- [ 27.922210] Kernel panic - not syncing: Fatal exception [ 27.927959] Dumping ftrace buffer: [ 27.931471] (ftrace buffer empty) [ 27.935149] Kernel Offset: disabled [ 27.938740] Rebooting in 86400 seconds..