[ 16.167261] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.236224] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.599488] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.387268] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) [ 23.562432] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. [ 28.962809] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.222894] kasan: CONFIG_KASAN_INLINE enabled [ 30.229822] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.246797] Dumping ftrace buffer: [ 30.250303] (ftrace buffer empty) [ 30.253982] Modules linked in: [ 30.257266] CPU: 0 PID: 3335 Comm: syzkaller662179 Not tainted 4.4.107-g610c835 #4 [ 30.265029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.274350] task: ffff8801d088c740 task.stack: ffff8801cc550000 [ 30.280374] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 30.288610] RSP: 0018:ffff8801cc557a90 EFLAGS: 00010a07 [ 30.294032] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 30.301269] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 30.308591] RBP: ffff8801cc557aa0 R08: 0000000000000000 R09: 0000000000000001 [ 30.315830] R10: 0000000000000000 R11: 1ffff100398aaf30 R12: 0000000000000004 [ 30.323076] R13: 0000000000000020 R14: ffff8800b388a100 R15: dffffc0000000000 [ 30.330314] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f779cb40 [ 30.338510] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.344357] CR2: 0000000020671000 CR3: 00000000b5aeb000 CR4: 00000000001406f0 [ 30.351597] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.358833] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.366068] Stack: [ 30.368181] 0000000000000246 ffff8800b388a258 ffff8801cc557b00 ffffffff825b8cf1 [ 30.376124] ffff8800b388a270 ffffed001671144b ffffed001671144e ffff8800b388a268 [ 30.384068] dead4ead00000000 ffff8800b388a240 0000000000000000 0000000000000000 [ 30.392011] Call Trace: [ 30.394566] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 30.401028] [] sg_finish_rem_req+0x2b5/0x340 [ 30.407051] [] sg_read+0xa21/0x1490 [ 30.412294] [] ? do_futex+0x3e3/0x1670 [ 30.417795] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.424426] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.431404] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.438034] [] __vfs_read+0x103/0x440 [ 30.443450] [] ? __fget+0x232/0x3b0 [ 30.448690] [] ? vfs_iter_write+0x2d0/0x2d0 [ 30.454626] [] ? fsnotify+0x5ad/0xee0 [ 30.460041] [] ? fsnotify+0xee0/0xee0 [ 30.465458] [] ? avc_policy_seqno+0x9/0x20 [ 30.471308] [] ? selinux_file_permission+0x348/0x460 [ 30.478032] [] ? security_file_permission+0x89/0x1e0 [ 30.484751] [] ? rw_verify_area+0x100/0x2f0 [ 30.490699] [] vfs_read+0x123/0x3a0 [ 30.495948] [] SyS_read+0xd9/0x1b0 [ 30.501104] [] ? do_sendfile+0xd30/0xd30 [ 30.506784] [] ? do_fast_syscall_32+0xd7/0x890 [ 30.512984] [] ? do_sendfile+0xd30/0xd30 executing program executing program executing program [ 30.518662] [] do_fast_syscall_32+0x314/0x890 [ 30.524779] [] sysenter_flags_fixed+0xd/0x17 [ 30.530807] Code: 76 ae 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 30.557070] RIP [] __free_pages+0x21/0x90 [ 30.562963] RSP executing program [ 30.580846] ---[ end trace 305fecc9604dc2e5 ]--- [ 30.585719] Kernel panic - not syncing: Fatal exception [ 30.591091] Dumping ftrace buffer: [ 30.594597] (ftrace buffer empty) [ 30.598272] Kernel Offset: disabled [ 30.601862] Rebooting in 86400 seconds..