[....] Starting OpenBSD Secure Shell server: sshd[ 11.829758] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.974397] random: sshd: uninitialized urandom read (32 bytes read) [ 34.485217] audit: type=1400 audit(1570244999.854:6): avc: denied { map } for pid=1775 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 [ 34.579452] random: sshd: uninitialized urandom read (32 bytes read) [ 35.121640] random: sshd: uninitialized urandom read (32 bytes read) [ 35.307527] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 40.820480] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.913824] audit: type=1400 audit(1570245006.284:7): avc: denied { map } for pid=1787 comm="syz-executor181" path="/root/syz-executor181893506" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 40.917126] kasan: CONFIG_KASAN_INLINE enabled [ 40.945016] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.952706] general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 40.959447] Modules linked in: [ 40.962623] CPU: 0 PID: 1787 Comm: syz-executor181 Not tainted 4.14.146+ #0 [ 40.969701] task: (ptrval) task.stack: (ptrval) [ 40.975747] RIP: 0010:__blockdev_direct_IO+0x1dcf/0xe24e [ 40.981173] RSP: 0018:ffff8881bebaf330 EFLAGS: 00010202 [ 40.986571] RAX: dffffc0000000000 RBX: ffffea00072de21c RCX: ffffffffa8638603 [ 40.993831] RDX: 0000000000000004 RSI: 0000000000000004 RDI: 0000000000000020 [ 41.001113] RBP: ffff8881bebaf668 R08: 0000000000000000 R09: fffff94000e5bc44 [ 41.008362] R10: fffff94000e5bc43 R11: ffffea00072de21f R12: ffffea00072de200 [ 41.015608] R13: ffffea00072de200 R14: 0000000000000000 R15: ffff8881d2a08000 [ 41.022859] FS: 0000555556c78880(0000) GS:ffff8881d7400000(0000) knlGS:0000000000000000 [ 41.031148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.037003] CR2: 0000558cab9d10d0 CR3: 00000001bea12001 CR4: 00000000001606b0 [ 41.044250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.051494] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.058739] Call Trace: [ 41.061320] ? sb_init_dio_done_wq+0x90/0x90 [ 41.065710] ? __bfs+0x25/0x540 [ 41.068979] ? ext4_dio_get_block_unwritten_sync+0xd0/0xd0 [ 41.074579] ? lock_downgrade+0x5d0/0x5d0 [ 41.078713] ext4_direct_IO+0xa4f/0x2820 [ 41.082752] ? ext4_dio_get_block_unwritten_sync+0xd0/0xd0 [ 41.088527] ? ext4_da_write_begin+0x10c0/0x10c0 [ 41.093263] ? current_time+0x16/0xb0 [ 41.097043] ? mark_held_locks+0xa6/0xf0 [ 41.101081] ? timespec_trunc+0xc9/0x140 [ 41.105119] ? put_itimerspec64+0x1c0/0x1c0 [ 41.109416] ? trace_hardirqs_on_caller+0x37b/0x540 [ 41.114418] ? current_kernel_time64+0xb6/0x100 [ 41.119065] ? current_time+0x89/0xb0 [ 41.122856] ? filemap_check_errors+0x8b/0xb0 [ 41.127328] generic_file_direct_write+0x1e4/0x430 [ 41.132264] __generic_file_write_iter+0x209/0x550 [ 41.137172] ? generic_write_checks+0x252/0x410 [ 41.141821] ext4_file_write_iter+0x58f/0xdb0 [ 41.146315] ? ext4_llseek+0x7f0/0x7f0 [ 41.150205] ? __lock_acquire+0x26eb/0x4320 [ 41.154506] ? lock_acquire+0x170/0x360 [ 41.158462] do_iter_readv_writev+0x379/0x580 [ 41.162940] ? clone_verify_area+0x1e0/0x1e0 [ 41.167328] ? avc_policy_seqno+0x5/0x10 [ 41.171370] ? security_file_permission+0x88/0x1e0 [ 41.176276] do_iter_write+0x152/0x550 [ 41.180145] vfs_iter_write+0x70/0xa0 [ 41.183924] iter_file_splice_write+0x560/0xa50 [ 41.188584] ? vmsplice_to_user+0x1e0/0x1e0 [ 41.192888] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 41.198331] ? rcu_read_lock_sched_held+0x10a/0x130 [ 41.203326] ? vmsplice_to_user+0x1e0/0x1e0 [ 41.207641] SyS_splice+0xcd6/0x1270 [ 41.211521] ? filp_open+0x60/0x60 [ 41.215042] ? SyS_recv+0x40/0x40 [ 41.218469] ? compat_SyS_vmsplice+0x150/0x150 [ 41.223028] ? do_syscall_64+0x43/0x520 [ 41.226978] ? compat_SyS_vmsplice+0x150/0x150 [ 41.231535] do_syscall_64+0x19b/0x520 [ 41.235403] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.240583] RIP: 0033:0x4402f9 [ 41.243762] RSP: 002b:00007ffc850ee2d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 41.251445] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9 [ 41.258701] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 [ 41.265948] RBP: 00000000006ca018 R08: 00000000ffffffff R09: 0000000000000000 [ 41.273214] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b80 [ 41.280461] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000 [ 41.287711] Code: ec a9 e8 85 69 e9 ff 0f 0b e8 0e bc cd ff 48 8b 84 24 e8 00 00 00 48 8d 78 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 37 a0 00 00 48 8b 84 24 e8 00 00 00 4c 8b 60 [ 41.306954] RIP: __blockdev_direct_IO+0x1dcf/0xe24e RSP: ffff8881bebaf330 [ 41.314311] ---[ end trace 9374d41056cbe25d ]--- [ 41.319059] Kernel panic - not syncing: Fatal exception [ 41.325084] Kernel Offset: 0x27000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 41.335984] Rebooting in 86400 seconds..