[ 12.805748] random: sshd: uninitialized urandom read (32 bytes read, 29 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: [ 36.625456] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 36.900483] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 37.474716] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 52.719700] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 57.836650] random: nonblocking pool is initialized Warning: Permanently added 'ci-android-44-kasan-gce-1,10.128.0.15' (ECDSA) to the list of known hosts. executing program [ 58.226899] kasan: CONFIG_KASAN_INLINE enabled [ 58.231318] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 58.244635] Dumping ftrace buffer: [ 58.248139] (ftrace buffer empty) [ 58.251814] Modules linked in: [ 58.255087] CPU: 1 PID: 3333 Comm: syzkaller438775 Not tainted 4.4.104-ged884eb #2 [ 58.262757] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.272076] task: ffff8800b7c64740 task.stack: ffff8801d44f8000 [ 58.278093] RIP: 0010:[] [] sg_read+0x93e/0x1260 [ 58.286138] RSP: 0018:ffff8801d44ffb20 EFLAGS: 00010246 [ 58.291549] RAX: dffffc0000000000 RBX: ffff8800b91e4e60 RCX: 000000000000000c [ 58.298785] RDX: 0000000000000000 RSI: ffff8800b91e4e84 RDI: ffff8800b7cc0170 [ 58.306018] RBP: ffff8801d44ffc18 R08: b54c6d8b5ad7cb0c R09: 0000000000000001 [ 58.313261] R10: 0000000000000000 R11: 1ffff1003a89ff2a R12: 0000000000000000 [ 58.320495] R13: ffff8800b7cc0140 R14: 0000000000000000 R15: 000000000000006e [ 58.327732] FS: 0000000000ad5880(0063) GS:ffff8801db500000(0000) knlGS:0000000000000000 [ 58.335920] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 58.341766] CR2: 0000000020188000 CR3: 00000001d9946000 CR4: 00000000001406e0 [ 58.349015] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 58.356249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 58.363482] Stack: [ 58.365592] ffff8801d44ffd80 ffff8800b7cc0158 ffff8801d44ffb78 ffff8800b7cc0168 [ 58.373533] 0000000000000092 ffff8801d44ffb78 0000000020cea000 0000000000001000 [ 58.381478] 1ffff1003a89ff6e 0000000020188024 0000000041b58ab3 ffffffff83fa5dde [ 58.389420] Call Trace: [ 58.391970] [] ? sg_proc_seq_show_debug+0xca0/0xca0 [ 58.398597] [] ? fsnotify+0xe40/0xe40 [ 58.404011] [] ? scsi_schedule_eh+0x180/0x180 [ 58.410120] [] do_loop_readv_writev+0x11c/0x1e0 [ 58.416400] [] ? security_file_permission+0x13d/0x190 [ 58.423201] [] ? sg_proc_seq_show_debug+0xca0/0xca0 [ 58.430348] [] ? sg_proc_seq_show_debug+0xca0/0xca0 [ 58.436993] [] do_readv_writev+0x552/0x660 [ 58.442841] [] ? vfs_write+0x520/0x520 [ 58.448341] [] ? _raw_spin_unlock+0x2c/0x50 [ 58.454272] [] ? do_huge_pmd_anonymous_page+0x487/0x980 [ 58.461246] [] ? handle_mm_fault+0x24ed/0x39b0 [ 58.467438] [] ? __slab_free+0x1ee/0x2b0 [ 58.473110] [] ? do_vfs_ioctl+0x681/0xe10 [ 58.478869] [] ? ioctl_preallocate+0x1d0/0x1d0 [ 58.485061] [] vfs_readv+0x5a/0xa0 [ 58.490213] [] ? __fdget_pos+0x13/0xb0 [ 58.495727] [] SyS_readv+0xd3/0x260 [ 58.500967] [] ? rw_copy_check_uvector+0x380/0x380 [ 58.507509] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 58.513979] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 58.520522] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a9 08 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 28 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 08 00 00 49 8b 04 24 48 85 c0 0f 84 ee 04 [ 58.546825] RIP [] sg_read+0x93e/0x1260 [ 58.552525] RSP [ 58.556548] ---[ end trace 0dd25533a185334b ]--- [ 58.561271] Kernel panic - not syncing: Fatal exception [ 58.566965] Dumping ftrace buffer: [ 58.570469] (ftrace buffer empty) [ 58.574142] Kernel Offset: disabled [ 58.577747] Rebooting in 86400 seconds..