[ 16.591321] 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: [ 20.797168] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.125408] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.931436] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 22.110796] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 27.483834] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 27.578464] kasan: CONFIG_KASAN_INLINE enabled [ 27.583091] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.595886] Dumping ftrace buffer: [ 27.599389] (ftrace buffer empty) [ 27.603663] Modules linked in: [ 27.606938] CPU: 0 PID: 3323 Comm: syzkaller704178 Not tainted 4.4.107-g610c835 #12 [ 27.614694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.624013] task: ffff8800b4c817c0 task.stack: ffff8800b41f8000 [ 27.630033] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.638255] RSP: 0018:ffff8800b41ffab0 EFLAGS: 00010a07 [ 27.643666] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.650910] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.658143] RBP: ffff8800b41ffac0 R08: 0000000000000001 R09: 0000000000000000 [ 27.665378] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.672613] R13: 0000000000000020 R14: ffff8800b58ba100 R15: dffffc0000000000 [ 27.679850] FS: 0000000001eb8880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.688048] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.693894] CR2: 000000000043e5a0 CR3: 00000000b41db000 CR4: 00000000001406f0 [ 27.701132] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.708379] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.715613] Stack: [ 27.717725] 0000000000000000 ffff8800b58ba258 ffff8800b41ffb20 ffffffff825b8cf1 [ 27.725673] ffff8800b58ba270 ffffed0016b1744b ffffed0016b1744e ffff8800b58ba268 [ 27.733622] dead4ead00000000 ffff8800b58ba240 0000000000000000 0000000000000000 [ 27.741999] Call Trace: [ 27.744553] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.751008] [] sg_finish_rem_req+0x2b5/0x340 [ 27.757029] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.763139] [] ? sg_get_rq_mark+0x142/0x190 [ 27.769073] [] sg_read+0x8c2/0x1490 [ 27.774314] [] ? save_stack_trace+0x26/0x50 [ 27.780248] [] ? save_stack+0x43/0xd0 [ 27.785666] [] ? kasan_slab_free+0x72/0xc0 [ 27.791518] [] ? kmem_cache_free+0xc7/0x320 [ 27.797454] [] ? do_sys_open+0x23a/0x4b0 [ 27.803129] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.809759] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.816568] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.823460] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.830089] [] __vfs_read+0x103/0x440 [ 27.835503] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.842392] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.848327] [] ? fsnotify+0x5ad/0xee0 [ 27.853745] [] ? fsnotify+0xee0/0xee0 [ 27.859167] [] ? avc_policy_seqno+0x9/0x20 [ 27.865017] [] ? selinux_file_permission+0x348/0x460 [ 27.871732] [] ? security_file_permission+0x89/0x1e0 [ 27.878448] [] ? rw_verify_area+0x100/0x2f0 [ 27.884382] [] vfs_read+0x123/0x3a0 [ 27.889623] [] SyS_read+0xd9/0x1b0 [ 27.894777] [] ? do_sendfile+0xd30/0xd30 [ 27.900459] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.906916] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.913456] 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 [ 27.939720] RIP [] __free_pages+0x21/0x90 [ 27.945596] RSP [ 27.949305] ---[ end trace 66ba96d0e5d101c9 ]--- [ 27.954042] Kernel panic - not syncing: Fatal exception [ 27.959793] Dumping ftrace buffer: [ 27.963306] (ftrace buffer empty) [ 27.966991] Kernel Offset: disabled [ 27.970590] Rebooting in 86400 seconds..