[ 15.921454] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.953186] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.349178] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.177888] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 22.346837] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 27.736770] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz4.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 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 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 [ 29.265735] random: nonblocking pool is initialized [ 29.270238] kasan: CONFIG_KASAN_INLINE enabled [ 29.270246] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.270250] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.270254] Dumping ftrace buffer: [ 29.270257] (ftrace buffer empty) [ 29.270260] Modules linked in: [ 29.270272] CPU: 0 PID: 3318 Comm: syzkaller285995 Not tainted 4.4.111-gf851888 #16 [ 29.270275] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.270279] task: ffff8801d22f2f80 task.stack: ffff8800b5840000 [ 29.270293] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.270296] RSP: 0018:ffff8800b5847970 EFLAGS: 00010a07 [ 29.270300] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 29.270303] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.270307] RBP: ffff8800b5847980 R08: 0000000000000001 R09: 0000000000000001 [ 29.270310] R10: 0000000000000000 R11: 1ffff10016b08f0c R12: 0000000000000004 [ 29.270313] R13: 0000000000000020 R14: ffff8800b0b8a100 R15: dffffc0000000000 [ 29.270319] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009fab900 [ 29.270322] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.270326] CR2: 0000000020dc8000 CR3: 00000000b3722000 CR4: 0000000000160670 [ 29.270331] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.270334] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.270335] Stack: [ 29.270343] ffffffff83776469 ffff8800b0b8a258 ffff8800b58479e0 ffffffff825b9ec1 [ 29.270350] ffff8800b0b8a270 ffffed001617144b ffffed001617144e ffff8800b0b8a268 [ 29.270357] dead4ead00000000 ffff8800b0b8a240 0000000000000000 0000000000000000 [ 29.270358] Call Trace: [ 29.270366] [] ? retint_kernel+0x2d/0x2d [ 29.270375] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.270381] [] sg_finish_rem_req+0x2b5/0x340 [ 29.270388] [] sg_new_read.isra.18+0x336/0x3c0 [ 29.270394] [] sg_read+0x8c2/0x1490 [ 29.270401] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.270407] [] ? fsnotify+0xee0/0xee0 [ 29.270415] [] ? avc_policy_seqno+0x9/0x20 [ 29.270423] [] do_loop_readv_writev+0x141/0x1e0 [ 29.270430] [] ? security_file_permission+0x89/0x1e0 [ 29.270436] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.270443] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.270449] [] compat_do_readv_writev+0x5df/0x6e0 [ 29.270455] [] ? vfs_writev+0xb0/0xb0 [ 29.270461] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.270468] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.270475] [] ? rw_verify_area+0x100/0x2f0 [ 29.270481] [] compat_readv+0xd9/0x140 [ 29.270487] [] compat_SyS_readv+0xd8/0x1b0 [ 29.270492] [] ? SyS_pwritev+0x230/0x230 [ 29.270499] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.270504] [] ? SyS_pwritev+0x230/0x230 [ 29.270509] [] do_fast_syscall_32+0x314/0x890 [ 29.270516] [] sysenter_flags_fixed+0xd/0x17 [ 29.270600] 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 [ 29.270606] RIP [] __free_pages+0x21/0x90 [ 29.270608] RSP [ 29.270613] ---[ end trace 01032bd22fb8a474 ]--- [ 29.270617] Kernel panic - not syncing: Fatal exception [ 29.620952] Dumping ftrace buffer: [ 29.624477] (ftrace buffer empty) [ 29.628153] Kernel Offset: disabled [ 29.631746] Rebooting in 86400 seconds..