[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.145963] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.827225] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.155998] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.848044] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) [ 23.196439] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 28.594702] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) executing program [ 28.706256] kasan: CONFIG_KASAN_INLINE enabled [ 28.710670] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.723769] Dumping ftrace buffer: [ 28.727272] (ftrace buffer empty) [ 28.730946] Modules linked in: [ 28.734214] CPU: 1 PID: 3316 Comm: syzkaller295917 Not tainted 4.4.107-g610c835 #12 [ 28.741973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.751296] task: ffff8801d19d0000 task.stack: ffff8801d0478000 [ 28.757315] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.765548] RSP: 0018:ffff8801d047fab0 EFLAGS: 00010a07 [ 28.770962] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.778196] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.785431] RBP: ffff8801d047fac0 R08: 0000000000000001 R09: 0000000000000000 [ 28.792663] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.799897] R13: 0000000000000020 R14: ffff8800b0e64200 R15: dffffc0000000000 [ 28.807132] FS: 0000000001920880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.815322] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.821166] CR2: 000000002082bf88 CR3: 00000001d1294000 CR4: 00000000001406e0 [ 28.828401] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.835637] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.842874] Stack: [ 28.844987] 0000000000000000 ffff8800b0e64358 ffff8801d047fb20 ffffffff825b8cf1 [ 28.852941] ffff8800b0e64370 ffffed00161cc86b ffffed00161cc86e ffff8800b0e64368 [ 28.860883] dead4ead00000000 ffff8800b0e64340 0000000000000000 0000000000000000 [ 28.868826] Call Trace: [ 28.871382] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.877841] [] sg_finish_rem_req+0x2b5/0x340 [ 28.883865] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.889975] [] ? sg_get_rq_mark+0x142/0x190 [ 28.895912] [] sg_read+0x8c2/0x1490 [ 28.901154] [] ? __lock_is_held+0xa1/0xf0 [ 28.906916] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.913547] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 28.920526] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.927156] [] __vfs_read+0x103/0x440 [ 28.932568] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.938503] [] ? fsnotify+0x5ad/0xee0 [ 28.943914] [] ? fsnotify+0xee0/0xee0 [ 28.949331] [] ? avc_policy_seqno+0x9/0x20 [ 28.955182] [] ? selinux_file_permission+0x348/0x460 [ 28.961899] [] ? security_file_permission+0x89/0x1e0 [ 28.968617] [] ? rw_verify_area+0x100/0x2f0 [ 28.974550] [] vfs_read+0x123/0x3a0 [ 28.979793] [] SyS_read+0xd9/0x1b0 [ 28.984945] [] ? do_sendfile+0xd30/0xd30 [ 28.990621] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.997093] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 29.003635] 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 [ 29.029928] RIP [] __free_pages+0x21/0x90 [ 29.035808] RSP [ 29.039750] ---[ end trace 46136361de268436 ]--- [ 29.044487] Kernel panic - not syncing: Fatal exception [ 29.050255] Dumping ftrace buffer: [ 29.053765] (ftrace buffer empty) [ 29.057438] Kernel Offset: disabled [ 29.061028] Rebooting in 86400 seconds..