[ 16.829773] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.869526] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.226245] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.968127] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) [ 22.137010] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 27.512170] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.658981] random: nonblocking pool is initialized [ 28.661595] kasan: CONFIG_KASAN_INLINE enabled [ 28.661604] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.661608] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.661612] Dumping ftrace buffer: [ 28.661615] (ftrace buffer empty) [ 28.661618] Modules linked in: [ 28.661625] CPU: 0 PID: 3328 Comm: syzkaller417656 Not tainted 4.4.111-g3301b55 #24 [ 28.661628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.661632] task: ffff8801d183df00 task.stack: ffff8801d16b0000 [ 28.661646] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.661649] RSP: 0018:ffff8801d16b79f0 EFLAGS: 00010a07 [ 28.661653] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 28.661657] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.661660] RBP: ffff8801d16b7a00 R08: 0000000000000001 R09: 0000000000000000 [ 28.661663] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.661666] R13: 0000000000000020 R14: ffff8800afe7c200 R15: dffffc0000000000 [ 28.661671] FS: 00000000014f4880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.661675] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.661679] CR2: 00000000204e9fd0 CR3: 00000001d6e28000 CR4: 0000000000160670 [ 28.661685] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.661688] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.661689] Stack: [ 28.661697] 0000000000000000 ffff8800afe7c358 ffff8801d16b7a60 ffffffff825b9ee1 [ 28.661704] ffff8800afe7c370 ffffed0015fcf86b ffffed0015fcf86e ffff8800afe7c368 [ 28.661710] dead4ead00000000 ffff8800afe7c340 0000000000000000 0000000000000000 [ 28.661712] Call Trace: [ 28.661721] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.661728] [] sg_finish_rem_req+0x2b5/0x340 [ 28.661735] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.661740] [] ? sg_get_rq_mark+0x142/0x190 [ 28.661747] [] sg_read+0x8c2/0x1490 [ 28.661755] [] ? __check_object_size+0x154/0x35b [ 28.661762] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.661768] [] ? fsnotify+0xee0/0xee0 [ 28.661776] [] ? avc_policy_seqno+0x9/0x20 [ 28.661783] [] do_loop_readv_writev+0x141/0x1e0 [ 28.661789] [] ? security_file_permission+0x89/0x1e0 [ 28.661796] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.661802] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.661809] [] do_readv_writev+0x5dd/0x6e0 [ 28.661815] [] ? vfs_write+0x530/0x530 [ 28.661822] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.661832] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.661840] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.661847] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.661852] [] ? __fsnotify_parent+0xbc/0x340 [ 28.661858] [] ? avc_policy_seqno+0x9/0x20 [ 28.661863] [] ? fsnotify+0x5ad/0xee0 [ 28.661870] [] vfs_readv+0x78/0xb0 [ 28.661875] [] SyS_readv+0xd9/0x240 [ 28.661881] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.661887] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.661893] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.661977] Code: 96 a4 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 [ 28.661983] RIP [] __free_pages+0x21/0x90 [ 28.661985] RSP [ 28.661990] ---[ end trace 1b0bfc7afc3de6b5 ]--- [ 28.661994] Kernel panic - not syncing: Fatal exception [ 29.031750] Dumping ftrace buffer: [ 29.035262] (ftrace buffer empty) [ 29.038937] Kernel Offset: disabled [ 29.042532] Rebooting in 86400 seconds..