[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.631876] random: sshd: uninitialized urandom read (32 bytes read) [ 32.061527] kauditd_printk_skb: 9 callbacks suppressed [ 32.061536] audit: type=1400 audit(1578253658.590:35): avc: denied { map } for pid=7055 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 [ 32.103080] random: sshd: uninitialized urandom read (32 bytes read) [ 32.724477] random: sshd: uninitialized urandom read (32 bytes read) [ 32.903939] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.54' (ECDSA) to the list of known hosts. [ 38.518049] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.629221] audit: type=1400 audit(1578253665.150:36): avc: denied { map } for pid=7068 comm="syz-executor590" path="/root/syz-executor590756928" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 38.632976] kasan: CONFIG_KASAN_INLINE enabled [ 38.656668] audit: type=1800 audit(1578253665.160:37): pid=7068 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor590" name="file0" dev="sda1" ino=16485 res=0 [ 38.660388] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.690532] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.696778] Modules linked in: [ 38.700028] CPU: 1 PID: 7068 Comm: syz-executor590 Not tainted 4.14.162-syzkaller #0 [ 38.707912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.717256] task: ffff888087438680 task.stack: ffff88808e8d0000 [ 38.723300] RIP: 0010:rb_erase+0x29/0x1c10 [ 38.727507] RSP: 0018:ffff88808e8d79d0 EFLAGS: 00010282 [ 38.732850] RAX: dffffc0000000000 RBX: ffff8880904936f0 RCX: 1ffff11011d1af12 [ 38.740099] RDX: 0000000000000001 RSI: ffffffff89b6cfe0 RDI: 0000000000000008 [ 38.747346] RBP: ffff88808e8d7a18 R08: ffffffff8960a02c R09: 0000000000001c62 [ 38.754602] R10: ffff88808e8d77d0 R11: ffff888087438680 R12: 0000000000000000 [ 38.761897] R13: ffff88809056e430 R14: 0000000000000000 R15: ffffffff86d97c60 [ 38.769151] FS: 0000000000a24880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 38.777749] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.783619] CR2: 000056390e1ee190 CR3: 000000007fd82000 CR4: 00000000001406e0 [ 38.790869] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.798221] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.805505] Call Trace: [ 38.808125] integrity_inode_free+0x126/0x320 [ 38.812643] security_inode_free+0x19/0x90 [ 38.816873] __destroy_inode+0x1ef/0x4e0 [ 38.820920] destroy_inode+0x50/0x120 [ 38.824699] evict+0x3e6/0x630 [ 38.827880] ? do_raw_spin_unlock+0x16b/0x260 [ 38.832364] iput+0x471/0x900 [ 38.835450] ? ext4_nfs_commit_metadata+0x2f0/0x2f0 [ 38.840444] ext4_ioctl+0x16b0/0x3920 [ 38.844337] ? avc_ss_reset+0x110/0x110 [ 38.848301] ? kasan_slab_free+0x75/0xc0 [ 38.852388] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 38.857565] ? find_held_lock+0x35/0x130 [ 38.861629] ? debug_check_no_obj_freed+0x2aa/0x7b7 [ 38.866636] ? __might_sleep+0x93/0xb0 [ 38.870507] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 38.875681] do_vfs_ioctl+0x7ae/0x1060 [ 38.879550] ? selinux_file_mprotect+0x5d0/0x5d0 [ 38.884284] ? ioctl_preallocate+0x1c0/0x1c0 [ 38.888680] ? putname+0xe0/0x120 [ 38.892155] ? do_sys_open+0x221/0x430 [ 38.896069] ? security_file_ioctl+0x7d/0xb0 [ 38.900455] ? security_file_ioctl+0x89/0xb0 [ 38.904850] SyS_ioctl+0x8f/0xc0 [ 38.908237] ? do_vfs_ioctl+0x1060/0x1060 [ 38.912380] do_syscall_64+0x1e8/0x640 [ 38.916266] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.921153] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 38.926333] RIP: 0033:0x440139 [ 38.929508] RSP: 002b:00007ffe692f35b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 38.937199] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440139 [ 38.944449] RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000003 [ 38.951743] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.958990] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004019c0 [ 38.966240] R13: 0000000000401a50 R14: 0000000000000000 R15: 0000000000000000 [ 38.973500] Code: 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 49 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 53 48 83 ec 20 <80> 3c 02 00 0f 85 0c 11 00 00 49 8d 7e 10 4d 8b 7e 08 48 b8 00 [ 38.992577] RIP: rb_erase+0x29/0x1c10 RSP: ffff88808e8d79d0 [ 38.998307] ---[ end trace 68f51e3b8a9918c4 ]--- [ 39.003065] Kernel panic - not syncing: Fatal exception [ 39.009937] Kernel Offset: disabled [ 39.013601] Rebooting in 86400 seconds..