[....] Starting file context maintaining daemon: restorecond[?2[ 16.424502] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) 5l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.393779] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 19.767053] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.601068] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 20.785678] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.15.207' (ECDSA) to the list of known hosts. [ 26.176023] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program [ 26.272420] kasan: CONFIG_KASAN_INLINE enabled [ 26.277482] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.290289] Dumping ftrace buffer: [ 26.293792] (ftrace buffer empty) [ 26.297468] Modules linked in: [ 26.300737] CPU: 0 PID: 3307 Comm: syzkaller899828 Not tainted 4.4.107-g610c835 #12 [ 26.308492] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.317809] task: ffff8801d0c10000 task.stack: ffff8801d05f8000 [ 26.323828] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.332055] RSP: 0018:ffff8801d05ffab0 EFLAGS: 00010a07 [ 26.337467] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.344702] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.351935] RBP: ffff8801d05ffac0 R08: 0000000000000001 R09: 0000000000000000 [ 26.359171] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.366404] R13: 0000000000000020 R14: ffff8801d0480000 R15: dffffc0000000000 [ 26.373639] FS: 00000000016d4880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.381830] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.387682] CR2: 0000000020001000 CR3: 00000001d1605000 CR4: 00000000001406f0 [ 26.394921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.402156] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.409388] Stack: [ 26.411502] 0000000000000000 ffff8801d0480158 ffff8801d05ffb20 ffffffff825b8cf1 [ 26.419445] ffff8801d0480170 ffffed003a09002b ffffed003a09002e ffff8801d0480168 [ 26.427389] dead4ead00000000 ffff8801d0480140 0000000000000000 0000000000000000 [ 26.435332] Call Trace: [ 26.437891] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.444347] [] sg_finish_rem_req+0x2b5/0x340 [ 26.450369] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.456488] [] ? sg_get_rq_mark+0x142/0x190 [ 26.462423] [] sg_read+0x8c2/0x1490 [ 26.467665] [] ? __lock_is_held+0xa1/0xf0 [ 26.473425] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.480057] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 26.487032] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.493663] [] __vfs_read+0x103/0x440 [ 26.499076] [] ? vfs_iter_write+0x2d0/0x2d0 [ 26.505010] [] ? fsnotify+0x5ad/0xee0 [ 26.510423] [] ? fsnotify+0xee0/0xee0 [ 26.515846] [] ? avc_policy_seqno+0x9/0x20 [ 26.521694] [] ? selinux_file_permission+0x348/0x460 [ 26.528410] [] ? security_file_permission+0x89/0x1e0 [ 26.535126] [] ? rw_verify_area+0x100/0x2f0 [ 26.541062] [] vfs_read+0x123/0x3a0 [ 26.546303] [] SyS_read+0xd9/0x1b0 [ 26.551466] [] ? do_sendfile+0xd30/0xd30 [ 26.557143] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 26.563601] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 26.570144] 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 [ 26.596468] RIP [] __free_pages+0x21/0x90 [ 26.602351] RSP [ 26.607498] ---[ end trace ae1142d96989817f ]--- [ 26.614334] Kernel panic - not syncing: Fatal exception [ 26.620103] Dumping ftrace buffer: [ 26.623624] (ftrace buffer empty) [ 26.627309] Kernel Offset: disabled [ 26.630902] Rebooting in 86400 seconds..