[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.612349] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.260127] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.549471] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.330758] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) [ 21.508319] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) Warning: Permanently added '10.128.15.232' (ECDSA) to the list of known hosts. [ 26.879149] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) executing program [ 26.978574] kasan: CONFIG_KASAN_INLINE enabled [ 26.983087] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.995883] Dumping ftrace buffer: [ 26.999393] (ftrace buffer empty) [ 27.003071] Modules linked in: [ 27.006345] CPU: 1 PID: 3324 Comm: syzkaller565782 Not tainted 4.4.107-g610c835 #12 [ 27.014112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.023439] task: ffff8801d0f1df00 task.stack: ffff8801d0848000 [ 27.029461] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.037693] RSP: 0018:ffff8801d084fab0 EFLAGS: 00010a07 [ 27.043107] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.050345] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.057589] RBP: ffff8801d084fac0 R08: 0000000000000001 R09: 0000000000000000 [ 27.064844] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.072082] R13: 0000000000000020 R14: ffff8801d0a4c200 R15: dffffc0000000000 [ 27.079327] FS: 0000000001fc9880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.087523] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.093373] CR2: 000000000043e5a0 CR3: 00000001cc858000 CR4: 00000000001406e0 [ 27.100619] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.107860] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.115107] Stack: [ 27.117224] 0000000000000000 ffff8801d0a4c358 ffff8801d084fb20 ffffffff825b8cf1 [ 27.125170] ffff8801d0a4c370 ffffed003a14986b ffffed003a14986e ffff8801d0a4c368 [ 27.133120] dead4ead00000000 ffff8801d0a4c340 0000000000000000 0000000000000000 [ 27.141062] Call Trace: [ 27.143634] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.150118] [] sg_finish_rem_req+0x2b5/0x340 [ 27.156144] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.162257] [] ? sg_get_rq_mark+0x142/0x190 [ 27.168204] [] sg_read+0x8c2/0x1490 [ 27.173469] [] ? save_stack_trace+0x26/0x50 [ 27.179408] [] ? save_stack+0x43/0xd0 [ 27.184824] [] ? kasan_slab_free+0x72/0xc0 [ 27.190672] [] ? kmem_cache_free+0xc7/0x320 [ 27.196613] [] ? do_sys_open+0x23a/0x4b0 [ 27.202291] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.208925] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.215733] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.222627] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.229280] [] __vfs_read+0x103/0x440 [ 27.234710] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.241621] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.247567] [] ? fsnotify+0x5ad/0xee0 [ 27.252983] [] ? fsnotify+0xee0/0xee0 [ 27.258401] [] ? avc_policy_seqno+0x9/0x20 [ 27.264248] [] ? selinux_file_permission+0x348/0x460 [ 27.270966] [] ? security_file_permission+0x89/0x1e0 [ 27.277690] [] ? rw_verify_area+0x100/0x2f0 [ 27.283627] [] vfs_read+0x123/0x3a0 [ 27.288870] [] SyS_read+0xd9/0x1b0 [ 27.294027] [] ? do_sendfile+0xd30/0xd30 [ 27.299714] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.306187] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.312731] 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 [ 27.339070] RIP [] __free_pages+0x21/0x90 [ 27.344973] RSP [ 27.349314] ---[ end trace 174bc3c93c84d79a ]--- [ 27.354284] Kernel panic - not syncing: Fatal exception [ 27.359965] Dumping ftrace buffer: [ 27.363471] (ftrace buffer empty) [ 27.367150] Kernel Offset: disabled [ 27.370744] Rebooting in 86400 seconds..