[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[[ 15.721960] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) 32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.937600] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.378890] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.334368] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 22.513138] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 27.885287] random: nonblocking pool is initialized executing program [ 28.002862] kasan: CONFIG_KASAN_INLINE enabled [ 28.007722] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.020598] Dumping ftrace buffer: [ 28.024108] (ftrace buffer empty) [ 28.027796] Modules linked in: [ 28.031075] CPU: 0 PID: 3309 Comm: syzkaller313250 Not tainted 4.4.111-gc2f631b #27 [ 28.038833] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.048157] task: ffff8801d10daf80 task.stack: ffff8800b4178000 [ 28.054179] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.062415] RSP: 0018:ffff8800b417fab0 EFLAGS: 00010a07 [ 28.067830] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9f5b [ 28.075068] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.082306] RBP: ffff8800b417fac0 R08: 0000000000000001 R09: 0000000000000000 [ 28.089545] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.096793] R13: 0000000000000020 R14: ffff8800b4a1c200 R15: dffffc0000000000 [ 28.104209] FS: 00000000018e0880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.112408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.118267] CR2: 000000000043e610 CR3: 00000000b56a4000 CR4: 0000000000160670 [ 28.125515] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.132757] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.139999] Stack: [ 28.142124] 0000000000000000 ffff8800b4a1c358 ffff8800b417fb20 ffffffff825b9f81 [ 28.150080] ffff8800b4a1c370 ffffed001694386b ffffed001694386e ffff8800b4a1c368 [ 28.158040] dead4ead00000000 ffff8800b4a1c340 0000000000000000 0000000000000000 [ 28.166001] Call Trace: [ 28.168563] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.175024] [] sg_finish_rem_req+0x2b5/0x340 [ 28.181059] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.187172] [] ? sg_get_rq_mark+0x142/0x190 [ 28.193111] [] sg_read+0x8c2/0x1490 [ 28.198361] [] ? save_stack_trace+0x26/0x50 [ 28.204301] [] ? save_stack+0x43/0xd0 [ 28.209717] [] ? kasan_slab_free+0x72/0xc0 [ 28.215568] [] ? kmem_cache_free+0xc7/0x320 [ 28.221507] [] ? do_sys_open+0x23a/0x4b0 [ 28.227185] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.233819] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 28.240628] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 28.247524] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.254157] [] __vfs_read+0x103/0x440 [ 28.259578] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.266473] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.272414] [] ? fsnotify+0x5ad/0xee0 [ 28.277837] [] ? fsnotify+0xee0/0xee0 [ 28.283257] [] ? avc_policy_seqno+0x9/0x20 [ 28.289117] [] ? selinux_file_permission+0x348/0x460 [ 28.295839] [] ? security_file_permission+0x89/0x1e0 [ 28.302563] [] ? rw_verify_area+0x100/0x2f0 [ 28.308505] [] vfs_read+0x123/0x3a0 [ 28.313748] [] SyS_read+0xd9/0x1b0 [ 28.318913] [] ? do_sendfile+0xd30/0xd30 [ 28.324609] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.331070] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.337613] 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 [ 28.364148] RIP [] __free_pages+0x21/0x90 [ 28.370128] RSP [ 28.374873] ---[ end trace 6e5f90a639957043 ]--- [ 28.379627] Kernel panic - not syncing: Fatal exception [ 28.385410] Dumping ftrace buffer: [ 28.388925] (ftrace buffer empty) [ 28.392610] Kernel Offset: disabled [ 28.396205] Rebooting in 86400 seconds..