[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.350487] 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: [ 20.443391] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.701708] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.445440] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 21.613977] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.15.230' (ECDSA) to the list of known hosts. [ 26.988378] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 27.086030] kasan: CONFIG_KASAN_INLINE enabled [ 27.090469] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.103545] Dumping ftrace buffer: [ 27.107055] (ftrace buffer empty) [ 27.110732] Modules linked in: [ 27.114008] CPU: 1 PID: 3319 Comm: syzkaller596441 Not tainted 4.4.107-g610c835 #12 [ 27.121766] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.131090] task: ffff8801d0da2f80 task.stack: ffff8801d1f48000 [ 27.137111] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.145339] RSP: 0018:ffff8801d1f4fab0 EFLAGS: 00010a07 [ 27.150752] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.157988] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.165226] RBP: ffff8801d1f4fac0 R08: 0000000000000001 R09: 0000000000000000 [ 27.172460] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.179781] R13: 0000000000000020 R14: ffff8801d0710000 R15: dffffc0000000000 [ 27.187019] FS: 0000000002005880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.195211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.201059] CR2: 000000000043e5a0 CR3: 00000001d5422000 CR4: 00000000001406e0 [ 27.208308] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.215544] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.222782] Stack: [ 27.224900] 0000000000000000 ffff8801d0710158 ffff8801d1f4fb20 ffffffff825b8cf1 [ 27.232864] ffff8801d0710170 ffffed003a0e202b ffffed003a0e202e ffff8801d0710168 [ 27.240825] dead4ead00000000 ffff8801d0710140 0000000000000000 0000000000000000 [ 27.248823] Call Trace: [ 27.251381] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.257840] [] sg_finish_rem_req+0x2b5/0x340 [ 27.263875] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.269994] [] ? sg_get_rq_mark+0x142/0x190 [ 27.275944] [] sg_read+0x8c2/0x1490 [ 27.281200] [] ? save_stack_trace+0x26/0x50 [ 27.287152] [] ? save_stack+0x43/0xd0 [ 27.292588] [] ? kasan_slab_free+0x72/0xc0 [ 27.298455] [] ? kmem_cache_free+0xc7/0x320 [ 27.304401] [] ? do_sys_open+0x23a/0x4b0 [ 27.310081] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.316714] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.323717] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.330619] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.337256] [] __vfs_read+0x103/0x440 [ 27.342726] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.349619] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.355559] [] ? fsnotify+0x5ad/0xee0 [ 27.360986] [] ? fsnotify+0xee0/0xee0 [ 27.366416] [] ? avc_policy_seqno+0x9/0x20 [ 27.372270] [] ? selinux_file_permission+0x348/0x460 [ 27.379000] [] ? security_file_permission+0x89/0x1e0 [ 27.385730] [] ? rw_verify_area+0x100/0x2f0 [ 27.391665] [] vfs_read+0x123/0x3a0 [ 27.396907] [] SyS_read+0xd9/0x1b0 [ 27.402073] [] ? do_sendfile+0xd30/0xd30 [ 27.407752] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.414212] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.420754] 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 [ 27.447267] RIP [] __free_pages+0x21/0x90 [ 27.453699] RSP [ 27.458270] ---[ end trace 6704f287eb3859b3 ]--- [ 27.463537] Kernel panic - not syncing: Fatal exception [ 27.469335] Dumping ftrace buffer: [ 27.472848] (ftrace buffer empty) [ 27.476733] Kernel Offset: disabled [ 27.480327] Rebooting in 86400 seconds..