[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.884248] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.731146] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.037973] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 22.951064] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 23.130429] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 28.516073] random: sshd: uninitialized urandom read (32 bytes read, 124 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 [ 28.622237] sg_write: data in/out 1870749719/174 bytes for SCSI command 0x46-- guessing data in; [ 28.622237] program syzkaller082980 not setting count and/or reply_len properly [ 28.632506] sg_write: data in/out 1870749719/174 bytes for SCSI command 0x46-- guessing data in; [ 28.632506] program syzkaller082980 not setting count and/or reply_len properly [ 28.666849] kasan: CONFIG_KASAN_INLINE enabled executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.671571] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.750756] Dumping ftrace buffer: [ 28.754283] (ftrace buffer empty) [ 28.757987] Modules linked in: [ 28.761306] CPU: 1 PID: 3337 Comm: syzkaller082980 Not tainted 4.4.107-g610c835 #4 [ 28.769003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.778657] task: ffff8801ccc617c0 task.stack: ffff8800b5e40000 [ 28.784706] RIP: 0010:[] [] __free_pages+0x21/0x90 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.793030] RSP: 0018:ffff8800b5e47a90 EFLAGS: 00010a07 [ 28.798479] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.805754] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 28.813038] RBP: ffff8800b5e47aa0 R08: ffffed003a1d9fcc R09: ffff8801d0ecfe40 [ 28.820300] R10: 0000000000000005 R11: ffffed003a1d9fcc R12: 0000000000000004 [ 28.827569] R13: 0000000000000020 R14: ffff8801d08e8000 R15: dffffc0000000000 [ 28.834878] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f76edb40 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.843118] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.849000] CR2: 0000000020005000 CR3: 00000000b57ff000 CR4: 00000000001406e0 [ 28.856263] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.863532] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.870800] Stack: [ 28.872952] 0000000000000000 ffff8801d08e8158 ffff8800b5e47b00 ffffffff825b8cf1 [ 28.881041] ffff8801d08e8170 ffffed003a11d02b ffffed003a11d02e ffff8801d08e8168 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.889078] dead4ead00000000 ffff8801d08e8140 0000000000000000 0000000000000000 [ 28.897391] Call Trace: [ 28.900020] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.906525] [] sg_finish_rem_req+0x2b5/0x340 [ 28.912609] [] sg_read+0xa21/0x1490 [ 28.917899] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.924576] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.931635] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.938329] [] __vfs_read+0x103/0x440 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.944520] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.950509] [] ? fsnotify+0x5ad/0xee0 [ 28.955962] [] ? fsnotify+0xee0/0xee0 [ 28.962097] [] ? avc_policy_seqno+0x9/0x20 [ 28.968504] [] ? selinux_file_permission+0x348/0x460 [ 28.975296] [] ? security_file_permission+0x89/0x1e0 [ 28.982067] [] ? rw_verify_area+0x100/0x2f0 [ 28.988049] [] vfs_read+0x123/0x3a0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.993365] [] SyS_read+0xd9/0x1b0 [ 28.998565] [] ? do_sendfile+0xd30/0xd30 [ 29.004281] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.010553] [] ? do_sendfile+0xd30/0xd30 [ 29.016271] [] do_fast_syscall_32+0x314/0x890 [ 29.022422] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.028567] 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 [ 29.057604] RIP [] __free_pages+0x21/0x90 [ 29.063559] RSP [ 29.075075] ---[ end trace beb4a1ada8e2bc63 ]--- [ 29.102389] Kernel panic - not syncing: Fatal exception [ 29.108671] Dumping ftrace buffer: [ 29.112191] (ftrace buffer empty) [ 29.115877] Kernel Offset: disabled [ 29.119489] Rebooting in 86400 seconds..