[ 16.357135] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?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: [ 20.255590] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.650835] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.525459] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 23.769689] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 29.159837] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.017980] kasan: CONFIG_KASAN_INLINE enabled [ 30.020911] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.020926] Dumping ftrace buffer: [ 30.020929] (ftrace buffer empty) [ 30.020931] Modules linked in: [ 30.020938] CPU: 0 PID: 3330 Comm: syzkaller994259 Not tainted 4.4.111-gf851888 #16 [ 30.020940] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.020943] task: ffff8801d1a78000 task.stack: ffff8801d0dc8000 [ 30.020945] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 30.020960] RSP: 0018:ffff8801d0dcf970 EFLAGS: 00010a07 [ 30.020962] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 30.020964] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 30.020966] RBP: ffff8801d0dcf980 R08: 0000000000000001 R09: 0000000000000000 [ 30.020968] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 30.020970] R13: 0000000000000020 R14: ffff8801cb904200 R15: dffffc0000000000 [ 30.020974] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008a4b840 [ 30.020976] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.020978] CR2: 00000000204e9fd0 CR3: 00000001d29aa000 CR4: 0000000000160670 [ 30.020983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.020985] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.020986] Stack: [ 30.020987] 0000000000000000 ffff8801cb904358 ffff8801d0dcf9e0 ffffffff825b9ec1 [ 30.020992] ffff8801cb904370 ffffed003972086b ffffed003972086e ffff8801cb904368 [ 30.020997] dead4ead00000000 ffff8801cb904340 0000000000000000 0000000000000000 [ 30.021001] Call Trace: [ 30.021010] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 30.021014] [] sg_finish_rem_req+0x2b5/0x340 [ 30.021018] [] sg_new_read.isra.18+0x39/0x3c0 [ 30.021022] [] ? sg_get_rq_mark+0x142/0x190 [ 30.021025] [] sg_read+0x8c2/0x1490 [ 30.021029] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.021034] [] ? fsnotify+0xee0/0xee0 [ 30.021043] [] ? avc_policy_seqno+0x9/0x20 [ 30.021050] [] do_loop_readv_writev+0x141/0x1e0 [ 30.021055] [] ? security_file_permission+0x89/0x1e0 [ 30.021062] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.021066] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.021070] [] compat_do_readv_writev+0x5df/0x6e0 [ 30.021074] [] ? vfs_writev+0xb0/0xb0 [ 30.021080] [] ? _raw_spin_unlock+0x2c/0x50 [ 30.021086] [] ? handle_mm_fault+0x3f2/0x3190 [ 30.021090] [] ? rw_verify_area+0x100/0x2f0 [ 30.021094] [] compat_readv+0xd9/0x140 [ 30.021098] [] compat_SyS_readv+0xd8/0x1b0 [ 30.021101] [] ? SyS_pwritev+0x230/0x230 [ 30.021107] [] ? do_fast_syscall_32+0xd7/0x890 [ 30.021110] [] ? SyS_pwritev+0x230/0x230 [ 30.021113] [] do_fast_syscall_32+0x314/0x890 [ 30.021117] [] sysenter_flags_fixed+0xd/0x17 [ 30.021118] Code: 96 a4 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 [ 30.021175] RIP [] __free_pages+0x21/0x90 [ 30.021180] RSP [ 30.021185] ---[ end trace 363b9886b337c4fc ]--- [ 30.021188] Kernel panic - not syncing: Fatal exception [ 30.022760] Dumping ftrace buffer: [ 30.022762] (ftrace buffer empty) [ 30.022764] Kernel Offset: disabled [ 30.387540] Rebooting in 86400 seconds..