[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.771188] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.760313] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.088221] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.907545] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 22.376361] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 27.750235] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program [ 27.851623] kasan: CONFIG_KASAN_INLINE enabled [ 27.856059] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.869559] Dumping ftrace buffer: [ 27.873062] (ftrace buffer empty) [ 27.876737] Modules linked in: [ 27.880010] CPU: 1 PID: 3328 Comm: syzkaller799409 Not tainted 4.4.107-g610c835 #4 [ 27.887679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.897000] task: ffff8800b4dd0000 task.stack: ffff8800b52e8000 [ 27.903022] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.911250] RSP: 0018:ffff8800b52efa40 EFLAGS: 00010a07 [ 27.916663] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.923901] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.931139] RBP: ffff8800b52efa50 R08: 0000000000000001 R09: 0000000000000000 [ 27.938379] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.945626] R13: 0000000000000020 R14: ffff8801d0f6a100 R15: dffffc0000000000 [ 27.952866] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000097c6840 [ 27.961057] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.966904] CR2: 0000000020001000 CR3: 00000000b5c80000 CR4: 00000000001406e0 [ 27.974142] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.981378] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.988613] Stack: [ 27.990727] 0000000000000000 ffff8801d0f6a258 ffff8800b52efab0 ffffffff825b8cf1 [ 27.998673] ffff8801d0f6a270 ffffed003a1ed44b ffffed003a1ed44e ffff8801d0f6a268 [ 28.006626] dead4ead00000000 ffff8801d0f6a240 0000000000000000 0000000000000000 [ 28.014575] Call Trace: [ 28.017131] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.023598] [] sg_finish_rem_req+0x2b5/0x340 [ 28.029627] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.035745] [] ? sg_get_rq_mark+0x142/0x190 [ 28.041682] [] sg_read+0x8c2/0x1490 [ 28.046930] [] ? save_stack_trace+0x26/0x50 [ 28.052869] [] ? save_stack+0x43/0xd0 [ 28.058283] [] ? kasan_slab_free+0x72/0xc0 [ 28.064132] [] ? kmem_cache_free+0xc7/0x320 [ 28.070070] [] ? putname+0xee/0x130 [ 28.075323] [] ? compat_SyS_open+0x2a/0x40 [ 28.081174] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.087806] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 28.094612] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 28.101504] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.108134] [] __vfs_read+0x103/0x440 [ 28.113550] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.120438] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.126372] [] ? fsnotify+0x5ad/0xee0 [ 28.131785] [] ? fsnotify+0xee0/0xee0 [ 28.137203] [] ? avc_policy_seqno+0x9/0x20 [ 28.143053] [] ? selinux_file_permission+0x348/0x460 [ 28.149769] [] ? security_file_permission+0x89/0x1e0 [ 28.156489] [] ? rw_verify_area+0x100/0x2f0 [ 28.162427] [] vfs_read+0x123/0x3a0 [ 28.167666] [] SyS_read+0xd9/0x1b0 [ 28.172821] [] ? do_sendfile+0xd30/0xd30 [ 28.178496] [] ? vmacache_update+0xfe/0x130 [ 28.184433] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.190631] [] ? do_sendfile+0xd30/0xd30 [ 28.196307] [] do_fast_syscall_32+0x314/0x890 [ 28.202421] [] sysenter_flags_fixed+0xd/0x17 [ 28.208441] 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 [ 28.234766] RIP [] __free_pages+0x21/0x90 [ 28.240641] RSP [ 28.244526] ---[ end trace 466738ac6d43ee99 ]--- [ 28.249272] Kernel panic - not syncing: Fatal exception [ 28.254649] Dumping ftrace buffer: [ 28.258163] (ftrace buffer empty) [ 28.261839] Kernel Offset: disabled [ 28.265430] Rebooting in 86400 seconds..