[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.418282] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.437273] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.800760] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.637175] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 27.462066] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.15.206' (ECDSA) to the list of known hosts. [ 32.829202] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) executing program [ 32.926876] kasan: CONFIG_KASAN_INLINE enabled [ 32.931303] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.944147] Dumping ftrace buffer: [ 32.947651] (ftrace buffer empty) [ 32.951326] Modules linked in: [ 32.954596] CPU: 1 PID: 3325 Comm: syzkaller020271 Not tainted 4.4.107-g610c835 #4 [ 32.962267] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.971588] task: ffff8800b4c797c0 task.stack: ffff8800b0a00000 [ 32.977608] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.985836] RSP: 0018:ffff8800b0a07a40 EFLAGS: 00010a07 [ 32.991261] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 32.998497] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 33.005733] RBP: ffff8800b0a07a50 R08: 0000000000000001 R09: 0000000000000000 [ 33.012969] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 33.020207] R13: 0000000000000020 R14: ffff8800b5d44200 R15: dffffc0000000000 [ 33.027443] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009d80840 [ 33.035635] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.041480] CR2: 0000000020001000 CR3: 00000000b57fd000 CR4: 00000000001406e0 [ 33.048718] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.055960] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.063217] Stack: [ 33.065336] 0000000000000000 ffff8800b5d44358 ffff8800b0a07ab0 ffffffff825b8cf1 [ 33.073289] ffff8800b5d44370 ffffed0016ba886b ffffed0016ba886e ffff8800b5d44368 [ 33.081242] dead4ead00000000 ffff8800b5d44340 0000000000000000 0000000000000000 [ 33.089191] Call Trace: [ 33.091750] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.098212] [] sg_finish_rem_req+0x2b5/0x340 [ 33.104248] [] sg_new_read.isra.18+0x39/0x3c0 [ 33.110359] [] ? sg_get_rq_mark+0x142/0x190 [ 33.116301] [] sg_read+0x8c2/0x1490 [ 33.121548] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.128352] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 33.134897] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 33.141534] [] ? __lock_is_held+0xa1/0xf0 [ 33.147302] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 33.153935] [] __vfs_read+0x103/0x440 [ 33.159350] [] ? vfs_iter_write+0x2d0/0x2d0 [ 33.165286] [] ? fsnotify+0x5ad/0xee0 [ 33.170704] [] ? fsnotify+0xee0/0xee0 [ 33.176120] [] ? _raw_spin_unlock+0x2c/0x50 [ 33.182066] [] ? avc_policy_seqno+0x9/0x20 [ 33.187917] [] ? selinux_file_permission+0x348/0x460 [ 33.194636] [] ? security_file_permission+0x89/0x1e0 [ 33.201354] [] ? rw_verify_area+0x100/0x2f0 [ 33.207306] [] vfs_read+0x123/0x3a0 [ 33.212554] [] SyS_read+0xd9/0x1b0 [ 33.217713] [] ? do_sendfile+0xd30/0xd30 [ 33.223388] [] ? do_fast_syscall_32+0xd7/0x890 [ 33.230206] [] ? do_sendfile+0xd30/0xd30 [ 33.235888] [] do_fast_syscall_32+0x314/0x890 [ 33.242001] [] sysenter_flags_fixed+0xd/0x17 [ 33.248200] 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 [ 33.274564] RIP [] __free_pages+0x21/0x90 [ 33.280447] RSP [ 33.284298] ---[ end trace 2d055301f0776f86 ]--- [ 33.290013] Kernel panic - not syncing: Fatal exception [ 33.295844] Dumping ftrace buffer: [ 33.299356] (ftrace buffer empty) [ 33.303033] Kernel Offset: disabled [ 33.306625] Rebooting in 86400 seconds..