[ 17.048898] random: sshd: uninitialized urandom read (32 bytes read, 34 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: [ 22.111632] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 22.438345] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 23.295379] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 23.465592] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 28.846028] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 28.942497] kasan: CONFIG_KASAN_INLINE enabled [ 28.946942] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.960555] Dumping ftrace buffer: [ 28.964059] (ftrace buffer empty) [ 28.967732] Modules linked in: [ 28.971007] CPU: 0 PID: 3320 Comm: syzkaller945350 Not tainted 4.4.107-g610c835 #4 [ 28.978676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.988005] task: ffff8801d1c5af80 task.stack: ffff8800b4aa8000 [ 28.994024] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.002253] RSP: 0018:ffff8800b4aafa40 EFLAGS: 00010a07 [ 29.007675] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.014918] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.022155] RBP: ffff8800b4aafa50 R08: 0000000000000001 R09: 0000000000000000 [ 29.029391] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.036625] R13: 0000000000000020 R14: ffff8800b4168000 R15: dffffc0000000000 [ 29.043858] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000099e6840 [ 29.052065] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.057910] CR2: 0000000020001000 CR3: 00000000b5561000 CR4: 00000000001406f0 [ 29.065146] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.072382] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.079616] Stack: [ 29.081730] 0000000000000000 ffff8800b4168158 ffff8800b4aafab0 ffffffff825b8cf1 [ 29.089674] ffff8800b4168170 ffffed001682d02b ffffed001682d02e ffff8800b4168168 [ 29.097621] dead4ead00000000 ffff8800b4168140 0000000000000000 0000000000000000 [ 29.105590] Call Trace: [ 29.108158] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.114617] [] sg_finish_rem_req+0x2b5/0x340 [ 29.120639] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.126749] [] ? sg_get_rq_mark+0x142/0x190 [ 29.132685] [] sg_read+0x8c2/0x1490 [ 29.137929] [] ? save_stack_trace+0x26/0x50 [ 29.143865] [] ? save_stack+0x43/0xd0 [ 29.149279] [] ? kasan_slab_free+0x72/0xc0 [ 29.155138] [] ? kmem_cache_free+0xc7/0x320 [ 29.161084] [] ? putname+0xee/0x130 [ 29.166328] [] ? compat_SyS_open+0x2a/0x40 [ 29.172181] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.178816] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 29.185623] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.192518] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.199159] [] __vfs_read+0x103/0x440 [ 29.204584] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.211478] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.217418] [] ? fsnotify+0x5ad/0xee0 [ 29.222840] [] ? fsnotify+0xee0/0xee0 [ 29.228265] [] ? avc_policy_seqno+0x9/0x20 [ 29.234115] [] ? selinux_file_permission+0x348/0x460 [ 29.240834] [] ? security_file_permission+0x89/0x1e0 [ 29.247553] [] ? rw_verify_area+0x100/0x2f0 [ 29.253490] [] vfs_read+0x123/0x3a0 [ 29.258753] [] SyS_read+0xd9/0x1b0 [ 29.263908] [] ? do_sendfile+0xd30/0xd30 [ 29.269592] [] ? vmacache_update+0xfe/0x130 [ 29.275539] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.281737] [] ? do_sendfile+0xd30/0xd30 [ 29.287421] [] do_fast_syscall_32+0x314/0x890 [ 29.293534] [] sysenter_flags_fixed+0xd/0x17 [ 29.300039] 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 [ 29.326537] RIP [] __free_pages+0x21/0x90 [ 29.332423] RSP [ 29.337148] ---[ end trace 3abab75f59bf6e39 ]--- [ 29.342789] Kernel panic - not syncing: Fatal exception [ 29.348590] Dumping ftrace buffer: [ 29.352104] (ftrace buffer empty) [ 29.355781] Kernel Offset: disabled [ 29.359371] Rebooting in 86400 seconds..