[ 16.590338] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.338415] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.757867] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.708077] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) [ 21.887829] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 27.253310] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) executing program [ 27.352283] kasan: CONFIG_KASAN_INLINE enabled [ 27.356960] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.369790] Dumping ftrace buffer: [ 27.373297] (ftrace buffer empty) [ 27.376976] Modules linked in: [ 27.380252] CPU: 0 PID: 3322 Comm: syzkaller080030 Not tainted 4.4.112-g52c02cf #30 [ 27.388012] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.397342] task: ffff8801d22d2f80 task.stack: ffff8800b4b78000 [ 27.403365] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.411594] RSP: 0018:ffff8800b4b7fab0 EFLAGS: 00010a07 [ 27.417009] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba68b [ 27.424248] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.431488] RBP: ffff8800b4b7fac0 R08: 0000000000000001 R09: 0000000000000001 [ 27.438727] R10: 0000000000000000 R11: 1ffff1001696ff34 R12: 0000000000000004 [ 27.445966] R13: 0000000000000020 R14: ffff8801d5772100 R15: dffffc0000000000 [ 27.453212] FS: 000000000205d880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.461410] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.467260] CR2: 00000000205c6000 CR3: 00000000b9dea000 CR4: 0000000000160670 [ 27.474502] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.481742] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.488979] Stack: [ 27.491095] ffffffff83776fe9 ffff8801d5772258 ffff8800b4b7fb20 ffffffff825ba6b1 [ 27.499058] ffff8801d5772270 ffffed003aaee44b ffffed003aaee44e ffff8801d5772268 [ 27.507017] dead4ead00000000 ffff8801d5772240 0000000000000000 0000000000000000 [ 27.514989] Call Trace: [ 27.517549] [] ? retint_kernel+0x2d/0x2d [ 27.523241] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.529708] [] sg_finish_rem_req+0x2b5/0x340 [ 27.535735] [] sg_new_read.isra.18+0x336/0x3c0 [ 27.541932] [] sg_read+0x8c2/0x1490 [ 27.547177] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.553810] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.560446] [] __vfs_read+0x103/0x440 [ 27.565864] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.571803] [] ? fsnotify+0x5ad/0xee0 [ 27.577232] [] ? fsnotify+0xee0/0xee0 [ 27.582649] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.588589] [] ? avc_policy_seqno+0x9/0x20 [ 27.594442] [] ? selinux_file_permission+0x348/0x460 [ 27.601167] [] ? security_file_permission+0x89/0x1e0 [ 27.607888] [] ? rw_verify_area+0x100/0x2f0 [ 27.613826] [] vfs_read+0x123/0x3a0 [ 27.619075] [] SyS_read+0xd9/0x1b0 [ 27.624230] [] ? do_sendfile+0xd30/0xd30 [ 27.629909] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.636371] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.642917] Code: 26 a6 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 [ 27.669436] RIP [] __free_pages+0x21/0x90 [ 27.675317] RSP [ 27.679166] ---[ end trace f924b9e1ead1aa5b ]--- [ 27.685034] Kernel panic - not syncing: Fatal exception [ 27.690851] Dumping ftrace buffer: [ 27.694364] (ftrace buffer empty) [ 27.698047] Kernel Offset: disabled [ 27.701642] Rebooting in 86400 seconds..