[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.856666] random: sshd: uninitialized urandom read (32 bytes read) [ 32.109481] kauditd_printk_skb: 9 callbacks suppressed [ 32.109489] audit: type=1400 audit(1567591548.697:35): avc: denied { map } for pid=6747 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 32.167668] random: sshd: uninitialized urandom read (32 bytes read) [ 32.677817] random: sshd: uninitialized urandom read (32 bytes read) [ 46.745847] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.33' (ECDSA) to the list of known hosts. [ 52.227253] random: sshd: uninitialized urandom read (32 bytes read) [ 52.342309] audit: type=1400 audit(1567591568.937:36): avc: denied { map } for pid=6760 comm="syz-executor777" path="/root/syz-executor777168264" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 52.610881] IPVS: ftp: loaded support on port[0] = 21 [ 53.453020] chnl_net:caif_netlink_parms(): no params data found [ 53.480789] bridge0: port 1(bridge_slave_0) entered blocking state [ 53.487415] bridge0: port 1(bridge_slave_0) entered disabled state [ 53.494801] device bridge_slave_0 entered promiscuous mode [ 53.501862] bridge0: port 2(bridge_slave_1) entered blocking state [ 53.508574] bridge0: port 2(bridge_slave_1) entered disabled state [ 53.515588] device bridge_slave_1 entered promiscuous mode [ 53.529000] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 53.538148] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 53.554006] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 53.561459] team0: Port device team_slave_0 added [ 53.566823] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 53.573964] team0: Port device team_slave_1 added [ 53.579117] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 53.586428] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 53.671996] device hsr_slave_0 entered promiscuous mode [ 53.730330] device hsr_slave_1 entered promiscuous mode [ 53.790783] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 53.797906] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 53.810405] bridge0: port 2(bridge_slave_1) entered blocking state [ 53.816800] bridge0: port 2(bridge_slave_1) entered forwarding state [ 53.823742] bridge0: port 1(bridge_slave_0) entered blocking state [ 53.830139] bridge0: port 1(bridge_slave_0) entered forwarding state [ 53.855684] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 53.862512] 8021q: adding VLAN 0 to HW filter on device bond0 [ 53.870706] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 53.878938] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 53.897544] bridge0: port 1(bridge_slave_0) entered disabled state [ 53.904777] bridge0: port 2(bridge_slave_1) entered disabled state [ 53.914567] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 53.921557] 8021q: adding VLAN 0 to HW filter on device team0 [ 53.929369] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 53.937436] bridge0: port 1(bridge_slave_0) entered blocking state [ 53.943796] bridge0: port 1(bridge_slave_0) entered forwarding state [ 53.954231] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 53.962112] bridge0: port 2(bridge_slave_1) entered blocking state [ 53.968590] bridge0: port 2(bridge_slave_1) entered forwarding state [ 53.985077] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 53.995173] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 54.006561] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 54.014482] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 54.022151] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 54.029602] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 54.038741] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 54.046326] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 54.053070] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 54.063486] IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready [ 54.073766] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 54.450694] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program executing program executing program [ 55.320691] hrtimer: interrupt took 24701 ns [ 55.322606] kasan: CONFIG_KASAN_INLINE enabled [ 55.325236] kobject: 'loop4' (ffff8880a4b1d460): kobject_uevent_env [ 55.329799] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 55.329811] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 55.329817] Modules linked in: [ 55.338154] kobject: 'loop4' (ffff8880a4b1d460): fill_kobj_path: path = '/devices/virtual/block/loop4' [ 55.343549] CPU: 1 PID: 6787 Comm: syz-executor777 Not tainted 4.14.141 #37 [ 55.343553] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.343556] task: ffff88808fbf2180 task.stack: ffff888087d08000 [ 55.343570] RIP: 0010:loop_validate_file+0x206/0x2d0 [ 55.343573] RSP: 0018:ffff888087d0fbc0 EFLAGS: 00010202 [ 55.343579] RAX: 0000000000000037 RBX: ffff8880a77b6218 RCX: 0000000000000000 [ 55.343586] RDX: 0000000000000000 RSI: ffff8880a77e0700 RDI: 00000000000001b8 [ 55.410522] RBP: ffff888087d0fbe0 R08: ffff88808fbf2180 R09: 0000000000000001 [ 55.418518] R10: 0000000000000000 R11: ffff88808fbf2180 R12: 0000000000000000 [ 55.425854] R13: ffff8880a77e0700 R14: dffffc0000000000 R15: ffff888219561c90 [ 55.433107] FS: 00007f1c27602700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 [ 55.441484] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.447343] CR2: 00007f1c27601db8 CR3: 0000000085fbb000 CR4: 00000000001406e0 [ 55.454604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.461863] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.469148] Call Trace: [ 55.471737] lo_ioctl+0xaa6/0x1ce0 [ 55.475362] ? loop_probe+0x160/0x160 [ 55.479142] blkdev_ioctl+0x96b/0x1860 [ 55.483028] ? blkpg_ioctl+0x980/0x980 [ 55.486896] ? __might_sleep+0x93/0xb0 [ 55.490760] ? __fget+0x210/0x370 [ 55.494189] block_ioctl+0xde/0x120 [ 55.497793] ? blkdev_fallocate+0x3b0/0x3b0 [ 55.502090] do_vfs_ioctl+0x7ae/0x1060 [ 55.505955] ? selinux_file_mprotect+0x5d0/0x5d0 [ 55.510689] ? lock_downgrade+0x6e0/0x6e0 [ 55.514816] ? ioctl_preallocate+0x1c0/0x1c0 [ 55.519301] ? __fget+0x237/0x370 [ 55.522754] ? security_file_ioctl+0x7d/0xb0 [ 55.527137] ? security_file_ioctl+0x89/0xb0 [ 55.531523] SyS_ioctl+0x8f/0xc0 [ 55.534870] ? do_vfs_ioctl+0x1060/0x1060 [ 55.539003] do_syscall_64+0x1e8/0x640 [ 55.542869] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.547691] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 55.552858] RIP: 0033:0x44dc49 [ 55.556030] RSP: 002b:00007f1c27601ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.563715] RAX: ffffffffffffffda RBX: 00000000006e6a18 RCX: 000000000044dc49 [ 55.570964] RDX: 0000000000000006 RSI: 0000000000004c00 RDI: 0000000000000004 [ 55.578214] RBP: 00000000006e6a10 R08: 00007f1c27602700 R09: 0000000000000000 [ 55.585479] R10: 00007f1c27602700 R11: 0000000000000246 R12: 00000000006e6a1c [ 55.592743] R13: 00007fff92f63faf R14: 00007f1c276029c0 R15: 0000000000000001 [ 55.600009] Code: 00 00 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 d4 00 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a8 00 00 00 4d 8b a4 24 b8 01 00 00 4c 89 [ 55.619197] RIP: loop_validate_file+0x206/0x2d0 RSP: ffff888087d0fbc0 [ 55.627076] ---[ end trace fa376e453dbfae2f ]--- [ 55.632106] Kernel panic - not syncing: Fatal exception [ 55.639174] Kernel Offset: disabled [ 55.642805] Rebooting in 86400 seconds..