[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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: [ 22.101672] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.313003] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.199437] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 24.276027] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 29.689703] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 29.781344] kasan: CONFIG_KASAN_INLINE enabled [ 29.786003] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.798829] Dumping ftrace buffer: [ 29.802337] (ftrace buffer empty) [ 29.806014] Modules linked in: [ 29.809286] CPU: 0 PID: 3312 Comm: syzkaller051866 Not tainted 4.4.107-g610c835 #12 [ 29.817072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.826405] task: ffff8801d199c740 task.stack: ffff8801d0be8000 [ 29.832428] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.840656] RSP: 0018:ffff8801d0befab0 EFLAGS: 00010a07 [ 29.846070] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.853314] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.860551] RBP: ffff8801d0befac0 R08: 0000000000000001 R09: 0000000000000000 [ 29.867789] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.875026] R13: 0000000000000020 R14: ffff8801cd748000 R15: dffffc0000000000 [ 29.882265] FS: 0000000001b83940(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.890457] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.896306] CR2: 000000000043eb90 CR3: 00000001d092e000 CR4: 00000000001406f0 [ 29.903594] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.910848] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.918086] Stack: [ 29.920198] 0000000000000000 ffff8801cd748158 ffff8801d0befb20 ffffffff825b8cf1 [ 29.928158] ffff8801cd748170 ffffed0039ae902b ffffed0039ae902e ffff8801cd748168 [ 29.936104] dead4ead00000000 ffff8801cd748140 0000000000000000 0000000000000000 [ 29.944071] Call Trace: [ 29.946631] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.953092] [] sg_finish_rem_req+0x2b5/0x340 [ 29.959116] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.965231] [] ? sg_get_rq_mark+0x142/0x190 [ 29.971176] [] sg_read+0x8c2/0x1490 [ 29.976425] [] ? save_stack_trace+0x26/0x50 [ 29.982368] [] ? save_stack+0x43/0xd0 [ 29.987794] [] ? kasan_slab_free+0x72/0xc0 [ 29.993644] [] ? kmem_cache_free+0xc7/0x320 [ 29.999600] [] ? do_sys_open+0x23a/0x4b0 [ 30.005286] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.011920] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 30.018726] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 30.025621] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.032258] [] __vfs_read+0x103/0x440 [ 30.037671] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 30.044563] [] ? vfs_iter_write+0x2d0/0x2d0 [ 30.050511] [] ? fsnotify+0x5ad/0xee0 [ 30.055946] [] ? fsnotify+0xee0/0xee0 [ 30.061368] [] ? avc_policy_seqno+0x9/0x20 [ 30.067224] [] ? selinux_file_permission+0x348/0x460 [ 30.073954] [] ? security_file_permission+0x89/0x1e0 [ 30.080677] [] ? rw_verify_area+0x100/0x2f0 [ 30.086613] [] vfs_read+0x123/0x3a0 [ 30.091855] [] SyS_read+0xd9/0x1b0 [ 30.097010] [] ? do_sendfile+0xd30/0xd30 [ 30.102690] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.109146] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 30.115689] 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 [ 30.142063] RIP [] __free_pages+0x21/0x90 [ 30.147944] RSP [ 30.151687] ---[ end trace f6707aeee96fef04 ]--- [ 30.156452] Kernel panic - not syncing: Fatal exception [ 30.162294] Dumping ftrace buffer: [ 30.165804] (ftrace buffer empty) [ 30.169483] Kernel Offset: disabled [ 30.173076] Rebooting in 86400 seconds..