[ 16.309304] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] 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: [ 19.837647] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 20.107109] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 20.975786] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 21.152607] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.15.208' (ECDSA) to the list of known hosts. [ 26.543825] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 26.656427] kasan: CONFIG_KASAN_INLINE enabled [ 26.660848] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.673646] Dumping ftrace buffer: [ 26.677156] (ftrace buffer empty) [ 26.680832] Modules linked in: [ 26.684110] CPU: 0 PID: 3315 Comm: syzkaller381928 Not tainted 4.4.107-g610c835 #12 [ 26.691872] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.701192] task: ffff8800b551c740 task.stack: ffff8800b4770000 [ 26.707210] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.715439] RSP: 0018:ffff8800b4777ab0 EFLAGS: 00010a07 [ 26.720851] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.728085] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.735324] RBP: ffff8800b4777ac0 R08: 0000000000000001 R09: 0000000000000000 [ 26.742563] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.749799] R13: 0000000000000020 R14: ffff8801d31ea100 R15: dffffc0000000000 [ 26.757037] FS: 0000000001d62880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.765227] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.771074] CR2: 000000000043e5a0 CR3: 00000000b7f54000 CR4: 00000000001406f0 [ 26.778315] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.785554] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.792797] Stack: [ 26.794907] 0000000000000000 ffff8801d31ea258 ffff8800b4777b20 ffffffff825b8cf1 [ 26.802851] ffff8801d31ea270 ffffed003a63d44b ffffed003a63d44e ffff8801d31ea268 [ 26.810800] dead4ead00000000 ffff8801d31ea240 0000000000000000 0000000000000000 [ 26.818750] Call Trace: [ 26.821304] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.827766] [] sg_finish_rem_req+0x2b5/0x340 [ 26.833793] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.839902] [] ? sg_get_rq_mark+0x142/0x190 [ 26.845850] [] sg_read+0x8c2/0x1490 [ 26.851092] [] ? save_stack_trace+0x26/0x50 [ 26.857028] [] ? save_stack+0x43/0xd0 [ 26.862441] [] ? kasan_slab_free+0x72/0xc0 [ 26.868294] [] ? kmem_cache_free+0xc7/0x320 [ 26.874229] [] ? do_sys_open+0x23a/0x4b0 [ 26.879909] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.886542] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 26.893346] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 26.900237] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.906867] [] __vfs_read+0x103/0x440 [ 26.912284] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 26.919172] [] ? vfs_iter_write+0x2d0/0x2d0 [ 26.925106] [] ? fsnotify+0x5ad/0xee0 [ 26.930520] [] ? fsnotify+0xee0/0xee0 [ 26.935937] [] ? avc_policy_seqno+0x9/0x20 [ 26.941791] [] ? selinux_file_permission+0x348/0x460 [ 26.948506] [] ? security_file_permission+0x89/0x1e0 [ 26.955234] [] ? rw_verify_area+0x100/0x2f0 [ 26.961168] [] vfs_read+0x123/0x3a0 [ 26.966411] [] SyS_read+0xd9/0x1b0 [ 26.971566] [] ? do_sendfile+0xd30/0xd30 [ 26.977242] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 26.983699] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 26.990244] 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 [ 27.016527] RIP [] __free_pages+0x21/0x90 [ 27.022403] RSP [ 27.026251] ---[ end trace fad394b741eb3b16 ]--- [ 27.030985] Kernel panic - not syncing: Fatal exception [ 27.036753] Dumping ftrace buffer: [ 27.040266] (ftrace buffer empty) [ 27.043940] Kernel Offset: disabled [ 27.047533] Rebooting in 86400 seconds..