[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.190086] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.723115] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.123733] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.990951] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 32.729055] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. [ 38.107185] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 38.204963] kasan: CONFIG_KASAN_INLINE enabled [ 38.209416] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.222262] Dumping ftrace buffer: [ 38.225772] (ftrace buffer empty) [ 38.229454] Modules linked in: [ 38.232745] CPU: 0 PID: 3330 Comm: syzkaller443015 Not tainted 4.4.113-ge70c132 #34 [ 38.240507] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.249831] task: ffff8801d0b5c740 task.stack: ffff8801d0168000 [ 38.255856] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 38.264092] RSP: 0018:ffff8801d016fab0 EFLAGS: 00010a07 [ 38.269510] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b6f2b [ 38.276750] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 38.283989] RBP: ffff8801d016fac0 R08: 0000000000000001 R09: 0000000000000000 [ 38.291232] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 38.298475] R13: 0000000000000020 R14: ffff8801d0bf4200 R15: dffffc0000000000 [ 38.305716] FS: 0000000001afb880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.313914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.319778] CR2: 0000000020a2f000 CR3: 00000001d146e000 CR4: 0000000000160670 [ 38.327031] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.334271] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.341511] Stack: [ 38.343627] 0000000000000000 ffff8801d0bf4358 ffff8801d016fb20 ffffffff825b6f51 [ 38.351614] ffff8801d0bf4370 ffffed003a17e86b ffffed003a17e86e ffff8801d0bf4368 [ 38.359580] dead4ead00000000 ffff8801d0bf4340 0000000000000000 0000000000000000 [ 38.368250] Call Trace: [ 38.370811] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 38.377274] [] sg_finish_rem_req+0x2b5/0x340 [ 38.383301] [] sg_new_read.isra.18+0x39/0x3c0 [ 38.389416] [] ? sg_get_rq_mark+0x142/0x190 [ 38.395357] [] sg_read+0x8bc/0x1490 [ 38.400602] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 38.407240] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 38.414224] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 38.420859] [] __vfs_read+0x103/0x440 [ 38.426280] [] ? vfs_iter_write+0x2d0/0x2d0 [ 38.432248] [] ? fsnotify+0x5ad/0xee0 [ 38.437668] [] ? fsnotify+0xee0/0xee0 [ 38.443091] [] ? avc_policy_seqno+0x9/0x20 [ 38.448945] [] ? selinux_file_permission+0x348/0x460 [ 38.455668] [] ? security_file_permission+0x89/0x1e0 [ 38.462393] [] ? rw_verify_area+0x100/0x2f0 [ 38.468335] [] vfs_read+0x123/0x3a0 [ 38.473584] [] SyS_read+0xd9/0x1b0 [ 38.478742] [] ? do_sendfile+0xd30/0xd30 [ 38.484422] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 38.490898] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 38.497454] Code: b6 9f 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 [ 38.524040] RIP [] __free_pages+0x21/0x90 [ 38.529930] RSP [ 38.537958] ---[ end trace 818eaf7fcf819daf ]--- [ 38.542757] Kernel panic - not syncing: Fatal exception [ 38.548471] Dumping ftrace buffer: [ 38.551987] (ftrace buffer empty) [ 38.555668] Kernel Offset: disabled [ 38.559266] Rebooting in 86400 seconds..