[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.960923] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.709012] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.239274] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.184474] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 28.357775] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 33.732153] random: nonblocking pool is initialized executing program [ 33.836720] kasan: CONFIG_KASAN_INLINE enabled [ 33.841296] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.854746] Dumping ftrace buffer: [ 33.858257] (ftrace buffer empty) [ 33.861936] Modules linked in: [ 33.865225] CPU: 1 PID: 4045 Comm: syzkaller007790 Not tainted 4.4.113-g962d1f3 #2 [ 33.872899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.882221] task: ffff8801d85297c0 task.stack: ffff8801c5170000 [ 33.888246] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 33.896480] RSP: 0018:ffff8801c5177ab0 EFLAGS: 00010a07 [ 33.901897] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b708b [ 33.909133] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 33.916370] RBP: ffff8801c5177ac0 R08: 0000000000000001 R09: 0000000000000001 [ 33.923611] R10: 0000000000000000 R11: 1ffff10038a2ef34 R12: 0000000000000004 [ 33.930852] R13: 0000000000000020 R14: ffff8801d8d1c200 R15: dffffc0000000000 [ 33.938093] FS: 0000000001084940(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.946285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.952143] CR2: 00000000201eb000 CR3: 00000001cc142000 CR4: 0000000000160670 [ 33.959382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.966620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.973945] Stack: [ 33.976061] ffffffff837728a9 ffff8801d8d1c358 ffff8801c5177b20 ffffffff825b70b1 [ 33.984030] ffff8801d8d1c370 ffffed003b1a386b ffffed003b1a386e ffff8801d8d1c368 [ 33.991994] dead4ead00000000 ffff8801d8d1c340 0000000000000000 0000000000000000 [ 33.999955] Call Trace: [ 34.002512] [] ? retint_kernel+0x2d/0x2d [ 34.008192] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 34.014651] [] sg_finish_rem_req+0x2b5/0x340 [ 34.020678] [] sg_new_read.isra.18+0x336/0x3c0 [ 34.026879] [] sg_read+0x8bc/0x1490 [ 34.032126] [] ? save_stack_trace+0x26/0x50 [ 34.038065] [] ? save_stack+0x43/0xd0 [ 34.043484] [] ? kasan_slab_free+0x72/0xc0 [ 34.049336] [] ? kmem_cache_free+0xc7/0x320 [ 34.055373] [] ? do_sys_open+0x23a/0x4b0 [ 34.061051] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.067687] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.074320] [] __vfs_read+0x103/0x440 [ 34.079745] [] ? vfs_iter_write+0x2d0/0x2d0 [ 34.085691] [] ? fsnotify+0x5ad/0xee0 [ 34.091107] [] ? fsnotify+0xee0/0xee0 [ 34.096530] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.102469] [] ? avc_policy_seqno+0x9/0x20 [ 34.108322] [] ? selinux_file_permission+0x348/0x460 [ 34.115137] [] ? security_file_permission+0x89/0x1e0 [ 34.122619] [] ? rw_verify_area+0x100/0x2f0 [ 34.128557] [] vfs_read+0x123/0x3a0 [ 34.133800] [] SyS_read+0xd9/0x1b0 [ 34.138954] [] ? do_sendfile+0xd30/0xd30 [ 34.144736] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.151211] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.157755] Code: b6 9f 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 [ 34.184445] RIP [] __free_pages+0x21/0x90 [ 34.190332] RSP [ 34.194337] ---[ end trace 306777ca735f9b51 ]--- [ 34.199382] Kernel panic - not syncing: Fatal exception [ 34.205143] Dumping ftrace buffer: [ 34.208658] (ftrace buffer empty) [ 34.212350] Kernel Offset: disabled [ 34.215950] Rebooting in 86400 seconds..