[ 16.819055] 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: [ 20.979127] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.421377] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.179029] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 22.344685] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. [ 27.877713] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) executing program [ 27.977115] kasan: CONFIG_KASAN_INLINE enabled [ 27.981539] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.994394] Dumping ftrace buffer: [ 27.997907] (ftrace buffer empty) [ 28.001586] Modules linked in: [ 28.004865] CPU: 0 PID: 3326 Comm: syzkaller966516 Not tainted 4.4.107-g610c835 #4 [ 28.012559] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.021891] task: ffff8801d1902f80 task.stack: ffff8800b4118000 [ 28.027911] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.036146] RSP: 0018:ffff8800b411fa40 EFLAGS: 00010a07 [ 28.041560] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.048801] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.056039] RBP: ffff8800b411fa50 R08: 0000000000000001 R09: 0000000000000000 [ 28.063277] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.070513] R13: 0000000000000020 R14: ffff8800b4044200 R15: dffffc0000000000 [ 28.077753] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000098e8840 [ 28.085947] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.091801] CR2: 0000000020001000 CR3: 00000000bab0c000 CR4: 00000000001406f0 [ 28.099058] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.106295] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.113538] Stack: [ 28.115653] 0000000000000000 ffff8800b4044358 ffff8800b411fab0 ffffffff825b8cf1 [ 28.123623] ffff8800b4044370 ffffed001680886b ffffed001680886e ffff8800b4044368 [ 28.131590] dead4ead00000000 ffff8800b4044340 0000000000000000 0000000000000000 [ 28.139544] Call Trace: [ 28.142106] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.148572] [] sg_finish_rem_req+0x2b5/0x340 [ 28.154603] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.160716] [] ? sg_get_rq_mark+0x142/0x190 [ 28.167876] [] sg_read+0x8c2/0x1490 [ 28.173126] [] ? save_stack_trace+0x26/0x50 [ 28.179065] [] ? save_stack+0x43/0xd0 [ 28.184486] [] ? kasan_slab_free+0x72/0xc0 [ 28.190337] [] ? kmem_cache_free+0xc7/0x320 [ 28.196277] [] ? putname+0xee/0x130 [ 28.201530] [] ? compat_SyS_open+0x2a/0x40 [ 28.207390] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.214022] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 28.220836] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 28.227729] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.234375] [] __vfs_read+0x103/0x440 [ 28.239791] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.246698] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.252635] [] ? fsnotify+0x5ad/0xee0 [ 28.258049] [] ? fsnotify+0xee0/0xee0 [ 28.263475] [] ? avc_policy_seqno+0x9/0x20 [ 28.269339] [] ? selinux_file_permission+0x348/0x460 [ 28.276074] [] ? security_file_permission+0x89/0x1e0 [ 28.282801] [] ? rw_verify_area+0x100/0x2f0 [ 28.288738] [] vfs_read+0x123/0x3a0 [ 28.293980] [] SyS_read+0xd9/0x1b0 [ 28.299145] [] ? do_sendfile+0xd30/0xd30 [ 28.304830] [] ? vmacache_update+0xfe/0x130 [ 28.310776] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.316992] [] ? do_sendfile+0xd30/0xd30 [ 28.322669] [] do_fast_syscall_32+0x314/0x890 [ 28.328783] [] sysenter_flags_fixed+0xd/0x17 [ 28.334819] 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 [ 28.361240] RIP [] __free_pages+0x21/0x90 [ 28.367137] RSP [ 28.374704] ---[ end trace f08db198211dbea4 ]--- [ 28.379462] Kernel panic - not syncing: Fatal exception [ 28.385360] Dumping ftrace buffer: [ 28.388874] (ftrace buffer empty) [ 28.392558] Kernel Offset: disabled [ 28.396153] Rebooting in 86400 seconds..