[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.255662] 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: [ 20.587586] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.868829] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.759823] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) [ 21.917577] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 27.286615] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) executing program [ 27.381878] kasan: CONFIG_KASAN_INLINE enabled [ 27.386735] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.399537] Dumping ftrace buffer: [ 27.403042] (ftrace buffer empty) [ 27.406717] Modules linked in: [ 27.409989] CPU: 0 PID: 3323 Comm: syzkaller229123 Not tainted 4.4.107-g610c835 #4 [ 27.417658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.426980] task: ffff8800b4f95f00 task.stack: ffff8801d22d0000 [ 27.433003] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.441234] RSP: 0018:ffff8801d22d7a40 EFLAGS: 00010a07 [ 27.446646] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.453881] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.461115] RBP: ffff8801d22d7a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.468349] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.475584] R13: 0000000000000020 R14: ffff8801d1168000 R15: dffffc0000000000 [ 27.482817] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009d14840 [ 27.491006] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.496851] CR2: 0000000020001000 CR3: 00000001d5341000 CR4: 00000000001406f0 [ 27.504435] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.512024] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.519262] Stack: [ 27.521377] 0000000000000000 ffff8801d1168158 ffff8801d22d7ab0 ffffffff825b8cf1 [ 27.529320] ffff8801d1168170 ffffed003a22d02b ffffed003a22d02e ffff8801d1168168 [ 27.537267] dead4ead00000000 ffff8801d1168140 0000000000000000 0000000000000000 [ 27.545208] Call Trace: [ 27.547764] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.554225] [] sg_finish_rem_req+0x2b5/0x340 [ 27.560256] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.566370] [] ? sg_get_rq_mark+0x142/0x190 [ 27.572313] [] sg_read+0x8c2/0x1490 [ 27.577817] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.584987] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.591623] [] ? __lock_is_held+0xa1/0xf0 [ 27.597388] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.604023] [] __vfs_read+0x103/0x440 [ 27.609441] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.615378] [] ? fsnotify+0x5ad/0xee0 [ 27.621060] [] ? fsnotify+0xee0/0xee0 [ 27.627178] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.633114] [] ? avc_policy_seqno+0x9/0x20 [ 27.638963] [] ? selinux_file_permission+0x348/0x460 [ 27.645679] [] ? security_file_permission+0x89/0x1e0 [ 27.652394] [] ? rw_verify_area+0x100/0x2f0 [ 27.658327] [] vfs_read+0x123/0x3a0 [ 27.663570] [] SyS_read+0xd9/0x1b0 [ 27.668722] [] ? do_sendfile+0xd30/0xd30 [ 27.674398] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.680592] [] ? do_sendfile+0xd30/0xd30 [ 27.686266] [] do_fast_syscall_32+0x314/0x890 [ 27.692391] [] sysenter_flags_fixed+0xd/0x17 [ 27.698411] 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 [ 27.724829] RIP [] __free_pages+0x21/0x90 [ 27.730709] RSP [ 27.734562] ---[ end trace 431ec3906f4be3c9 ]--- [ 27.739295] Kernel panic - not syncing: Fatal exception [ 27.745253] Dumping ftrace buffer: [ 27.748763] (ftrace buffer empty) [ 27.752440] Kernel Offset: disabled [ 27.756032] Rebooting in 86400 seconds..