[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.509347] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.313431] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.615111] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.966692] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 27.127724] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 30.983554] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. executing program [ 32.605025] kasan: CONFIG_KASAN_INLINE enabled [ 32.609438] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.622865] Dumping ftrace buffer: [ 32.626375] (ftrace buffer empty) [ 32.630058] Modules linked in: [ 32.633340] CPU: 1 PID: 3759 Comm: syz-executor692 Not tainted 4.4.141-g1b37d68 #71 [ 32.641103] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.650431] task: ffff8801d06ce000 task.stack: ffff8801d9528000 [ 32.656472] RIP: 0010:[] [] nf_tables_set_lookup+0x3c/0xc0 [ 32.665403] RSP: 0018:ffff8801d952f598 EFLAGS: 00010202 [ 32.670823] RAX: dffffc0000000000 RBX: ffffffffffffffea RCX: 1ffff1003b2a5ecd [ 32.678064] RDX: 0000000000000004 RSI: ffffffff8314e797 RDI: 0000000000000000 [ 32.685306] RBP: ffff8801d952f5b8 R08: ffff8801d952f6f8 R09: 0000000000000000 [ 32.692545] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020 [ 32.699796] R13: ffff8801cfae0794 R14: 0000000000000000 R15: ffff8801d952f6f8 [ 32.707043] FS: 00000000012d8880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.715240] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.721119] CR2: 0000000020000040 CR3: 00000001d2266000 CR4: 00000000001606f0 [ 32.728364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.735611] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.742851] Stack: [ 32.744970] 1ffff1003b2a5ebb ffff8801ccaa2780 ffff8801cfae0780 ffff8801d952f6b8 [ 32.752964] ffff8801d952f6e0 ffffffff8314fda9 ffff8801d952f658 ffff8800b6fce600 [ 32.760943] 0000000041b58ab3 ffffffff8423ef33 ffffffff8314fc00 ffffffff838bb724 [ 32.768914] Call Trace: [ 32.771481] [] nf_tables_getset+0x1a9/0x510 [ 32.777423] [] ? nf_tables_delset+0x280/0x280 [ 32.783542] [] ? mutex_lock_nested+0x574/0x850 [ 32.789754] [] ? nfnetlink_rcv_msg+0x7a3/0xc00 [ 32.795963] [] ? mutex_lock_killable_nested+0x980/0x980 [ 32.802949] [] ? nf_tables_delset+0x280/0x280 [ 32.809066] [] nfnetlink_rcv_msg+0xa19/0xc00 [ 32.815098] [] netlink_rcv_skb+0x145/0x370 [ 32.820954] [] ? nfnetlink_bind+0x250/0x250 [ 32.826896] [] nfnetlink_rcv+0x983/0x10a0 [ 32.832676] [] ? netlink_deliver_tap+0x93/0x910 [ 32.838966] [] ? netlink_deliver_tap+0xba/0x910 [ 32.845266] [] ? selinux_nlmsg_lookup+0x187/0x4f0 [ 32.851730] [] ? netlink_trim+0x208/0x280 [ 32.857501] [] netlink_unicast+0x4e9/0x700 [ 32.863364] [] ? netlink_attachskb+0x6a0/0x6a0 [ 32.869565] [] netlink_sendmsg+0x795/0xc30 [ 32.875419] [] ? netlink_unicast+0x700/0x700 [ 32.881449] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 32.887915] [] ? security_socket_sendmsg+0x8f/0xc0 [ 32.894484] [] ? netlink_unicast+0x700/0x700 [ 32.900513] [] sock_sendmsg+0xcc/0x110 [ 32.906025] [] ___sys_sendmsg+0x745/0x880 [ 32.911801] [] ? copy_msghdr_from_user+0x550/0x550 [ 32.918351] [] ? check_preemption_disabled+0x3b/0x170 [ 32.925161] [] ? native_set_pte_at+0xe0/0xe0 [ 32.931191] [] ? do_huge_pmd_anonymous_page+0x737/0x9d0 [ 32.938177] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.944131] [] ? do_huge_pmd_anonymous_page+0x38c/0x9d0 [ 32.951116] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 32.957848] [] ? __fget_light+0x9f/0x1f0 [ 32.963542] [] ? __fdget+0x18/0x20 [ 32.968711] [] __sys_sendmsg+0xd6/0x190 [ 32.974306] [] ? SyS_shutdown+0x1b0/0x1b0 [ 32.980081] [] ? vmacache_update+0xfe/0x130 [ 32.986024] [] ? __do_page_fault+0x38a/0xa10 [ 32.992053] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.998866] [] SyS_sendmsg+0x2d/0x50 [ 33.004214] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.010757] Code: 48 c7 c3 ea ff ff ff e8 93 2d 20 fe 4d 85 ed 74 65 e8 89 2d 20 fe 4d 8d 66 20 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 69 49 8b 5e 20 49 be 00 00 00 00 00 fc ff df 4c [ 33.037446] RIP [] nf_tables_set_lookup+0x3c/0xc0 [ 33.044030] RSP [ 33.048472] ---[ end trace 6f8bf978fb5f3cc1 ]--- [ 33.053238] Kernel panic - not syncing: Fatal exception [ 33.059131] Dumping ftrace buffer: [ 33.062648] (ftrace buffer empty) [ 33.066328] Kernel Offset: disabled [ 33.069927] Rebooting in 86400 seconds..