[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[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: [ 26.982168] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.409755] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.393713] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 28.577486] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 28.685974] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.206' (ECDSA) to the list of known hosts. executing program [ 34.069407] kasan: CONFIG_KASAN_INLINE enabled [ 34.074242] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.087064] Dumping ftrace buffer: [ 34.090570] (ftrace buffer empty) [ 34.094248] Modules linked in: [ 34.097525] CPU: 0 PID: 4055 Comm: syzkaller308598 Not tainted 4.4.113-g202e079 #1 [ 34.105196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.114521] task: ffff8801d9574740 task.stack: ffff8800aa250000 [ 34.120546] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 34.128794] RSP: 0018:ffff8800aa257ab0 EFLAGS: 00010a07 [ 34.134308] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b6f2b [ 34.141558] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 34.148796] RBP: ffff8800aa257ac0 R08: 0000000000000001 R09: 0000000000000001 [ 34.156033] R10: 0000000000000000 R11: 1ffff1001544af34 R12: 0000000000000004 [ 34.163278] R13: 0000000000000020 R14: ffff8800b9a54200 R15: dffffc0000000000 [ 34.170515] FS: 000000000092a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.178715] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.184563] CR2: 0000000020919000 CR3: 00000000af8c8000 CR4: 0000000000160670 [ 34.191802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.199042] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.206281] Stack: [ 34.208399] ffffffff83772769 ffff8800b9a54358 ffff8800aa257b20 ffffffff825b6f51 [ 34.216381] ffff8800b9a54370 ffffed001734a86b ffffed001734a86e ffff8800b9a54368 [ 34.224363] dead4ead00000000 ffff8800b9a54340 0000000000000000 0000000000000000 [ 34.232332] Call Trace: [ 34.234892] [] ? retint_kernel+0x2d/0x2d [ 34.240573] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 34.247037] [] sg_finish_rem_req+0x2b5/0x340 [ 34.253065] [] sg_new_read.isra.18+0x336/0x3c0 [ 34.259275] [] sg_read+0x8bc/0x1490 [ 34.264520] [] ? save_stack_trace+0x26/0x50 [ 34.270461] [] ? save_stack+0x43/0xd0 [ 34.275878] [] ? kasan_slab_free+0x72/0xc0 [ 34.281728] [] ? kmem_cache_free+0xc7/0x320 [ 34.287667] [] ? do_sys_open+0x23a/0x4b0 [ 34.293352] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.299988] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 34.306793] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 34.313690] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.320322] [] __vfs_read+0x103/0x440 [ 34.325744] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 34.332640] [] ? vfs_iter_write+0x2d0/0x2d0 [ 34.338581] [] ? fsnotify+0x5ad/0xee0 [ 34.343999] [] ? fsnotify+0xee0/0xee0 [ 34.349420] [] ? avc_policy_seqno+0x9/0x20 [ 34.355276] [] ? selinux_file_permission+0x348/0x460 [ 34.362000] [] ? security_file_permission+0x89/0x1e0 [ 34.368722] [] ? rw_verify_area+0x100/0x2f0 [ 34.374662] [] vfs_read+0x123/0x3a0 [ 34.379906] [] SyS_read+0xd9/0x1b0 [ 34.385066] [] ? do_sendfile+0xd30/0xd30 [ 34.390753] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.397217] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.403761] 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 [ 34.430289] RIP [] __free_pages+0x21/0x90 [ 34.436172] RSP [ 34.440189] ---[ end trace eafabcecd9ee8d5d ]--- [ 34.444946] Kernel panic - not syncing: Fatal exception [ 34.450757] Dumping ftrace buffer: [ 34.454267] (ftrace buffer empty) [ 34.457951] Kernel Offset: disabled [ 34.461544] Rebooting in 86400 seconds..