[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.084742] 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: [ 20.393097] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.737457] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.618320] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 21.792547] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 27.189345] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 executing program executing program [ 28.078048] sg_write: data in/out 327644/100 bytes for SCSI command 0x0-- guessing data in; [ 28.078048] program syzkaller564886 not setting count and/or reply_len properly [ 28.111100] sg_write: data in/out 327644/100 bytes for SCSI command 0x0-- guessing data in; [ 28.111100] program syzkaller564886 not setting count and/or reply_len properly [ 28.128525] kasan: CONFIG_KASAN_INLINE enabled [ 28.130046] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.130063] Dumping ftrace buffer: [ 28.130066] (ftrace buffer empty) [ 28.130068] Modules linked in: [ 28.130076] CPU: 0 PID: 3507 Comm: syzkaller564886 Not tainted 4.4.107-g610c835 #12 [ 28.130079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.130083] task: ffff8801cef84740 task.stack: ffff8800b05c0000 [ 28.130086] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.130102] RSP: 0018:ffff8800b05c7a40 EFLAGS: 00010a07 [ 28.130106] RAX: dffffc0000000000 RBX: dead4eac00000000 RCX: ffffffff825b8ccb [ 28.130110] RDX: 1bd5a9d580000003 RSI: 0000000000000000 RDI: dead4eac0000001c [ 28.130113] RBP: ffff8800b05c7a50 R08: ffffed003afaa3f0 R09: ffff8801d7d51f60 [ 28.130116] R10: 0000000000000005 R11: ffffed003afaa3f0 R12: 0000000000000004 [ 28.130120] R13: 0000000000000020 R14: ffff8800b2890000 R15: dffffc0000000000 [ 28.130125] FS: 00007f754b9b0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.130129] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.130132] CR2: 00000000208b0000 CR3: 00000000b5287000 CR4: 00000000001406f0 [ 28.130139] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.130142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.130143] Stack: [ 28.130145] 0000000000000000 ffff8800b2890158 ffff8800b05c7ab0 ffffffff825b8cf1 [ 28.130153] ffff8800b2890170 ffffed001651202b ffffed001651202e ffff8800b2890168 [ 28.130161] dead4eac00000000 ffff8800b2890140 0000000000000000 0000000000000000 [ 28.130168] Call Trace: [ 28.130178] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.130185] [] sg_finish_rem_req+0x2b5/0x340 [ 28.130191] [] sg_read+0xa21/0x1490 [ 28.130201] [] ? __check_object_size+0x154/0x35b [ 28.130213] [] ? 0xffffffff810002b8 [ 28.130220] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.130226] [] ? fsnotify+0xee0/0xee0 [ 28.130235] [] ? avc_policy_seqno+0x9/0x20 [ 28.130242] [] do_loop_readv_writev+0x141/0x1e0 [ 28.130249] [] ? security_file_permission+0x89/0x1e0 [ 28.130255] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.130262] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.130268] [] do_readv_writev+0x5dd/0x6e0 [ 28.130274] [] ? vfs_write+0x530/0x530 [ 28.130281] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.130287] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.130294] [] ? __fget+0x20b/0x3b0 [ 28.130300] [] ? __fget+0x232/0x3b0 [ 28.130305] [] ? __fget+0x47/0x3b0 [ 28.130311] [] vfs_readv+0x78/0xb0 [ 28.130316] [] SyS_readv+0xd9/0x240 [ 28.130322] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.130329] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.130335] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 28.130338] 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 [ 28.130440] RIP [] __free_pages+0x21/0x90 [ 28.130447] RSP [ 28.130452] ---[ end trace 6c606c967a45fcae ]--- [ 28.130456] Kernel panic - not syncing: Fatal exception [ 28.133328] Dumping ftrace buffer: [ 28.133330] (ftrace buffer empty) [ 28.133332] Kernel Offset: disabled [ 28.496506] Rebooting in 86400 seconds..