[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.236030] 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: [ 20.213237] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.540815] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.308361] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) [ 21.476269] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts. [ 26.852318] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) executing program [ 26.953830] kasan: CONFIG_KASAN_INLINE enabled [ 26.958246] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.971014] Dumping ftrace buffer: [ 26.974514] (ftrace buffer empty) [ 26.978187] Modules linked in: [ 26.981453] CPU: 0 PID: 3315 Comm: syzkaller549948 Not tainted 4.4.107-g610c835 #4 [ 26.989121] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.998438] task: ffff8801d15d0000 task.stack: ffff8800b47c0000 [ 27.004455] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.012678] RSP: 0018:ffff8800b47c7a40 EFLAGS: 00010a07 [ 27.018090] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.025323] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.032555] RBP: ffff8800b47c7a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.039789] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.047022] R13: 0000000000000020 R14: ffff8801d13ec200 R15: dffffc0000000000 [ 27.054258] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000088b6840 [ 27.062446] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.068292] CR2: 0000000020671f39 CR3: 00000000b4517000 CR4: 00000000001406f0 [ 27.075527] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.082762] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.090000] Stack: [ 27.092120] 0000000000000000 ffff8801d13ec358 ffff8800b47c7ab0 ffffffff825b8cf1 [ 27.100077] ffff8801d13ec370 ffffed003a27d86b ffffed003a27d86e ffff8801d13ec368 [ 27.108046] dead4ead00000000 ffff8801d13ec340 0000000000000000 0000000000000000 [ 27.115999] Call Trace: [ 27.118558] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.125018] [] sg_finish_rem_req+0x2b5/0x340 [ 27.131042] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.137151] [] ? sg_get_rq_mark+0x142/0x190 [ 27.143086] [] sg_read+0x8c2/0x1490 [ 27.148327] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.155477] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.162105] [] ? __lock_is_held+0xa1/0xf0 [ 27.167865] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.174495] [] __vfs_read+0x103/0x440 [ 27.179911] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.185845] [] ? fsnotify+0x5ad/0xee0 [ 27.191259] [] ? fsnotify+0xee0/0xee0 [ 27.196675] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.202613] [] ? avc_policy_seqno+0x9/0x20 [ 27.208460] [] ? selinux_file_permission+0x348/0x460 [ 27.215176] [] ? security_file_permission+0x89/0x1e0 [ 27.221894] [] ? rw_verify_area+0x100/0x2f0 [ 27.227827] [] vfs_read+0x123/0x3a0 [ 27.233068] [] SyS_read+0xd9/0x1b0 [ 27.238220] [] ? do_sendfile+0xd30/0xd30 [ 27.243896] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.250089] [] ? do_sendfile+0xd30/0xd30 [ 27.255761] [] do_fast_syscall_32+0x314/0x890 [ 27.261873] [] sysenter_flags_fixed+0xd/0x17 [ 27.267890] 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 [ 27.294113] RIP [] __free_pages+0x21/0x90 [ 27.299987] RSP [ 27.303881] ---[ end trace 6081d080d279a3b1 ]--- [ 27.309018] Kernel panic - not syncing: Fatal exception [ 27.314385] Dumping ftrace buffer: [ 27.317892] (ftrace buffer empty) [ 27.321568] Kernel Offset: disabled [ 27.325159] Rebooting in 86400 seconds..