[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.331163] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.501365] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.784950] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.613286] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) [ 21.785520] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 27.187056] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) executing program [ 27.301901] IPVS: Creating netns size=2552 id=1 [ 27.329847] IPVS: Creating netns size=2552 id=2 [ 27.332149] kasan: CONFIG_KASAN_INLINE enabled [ 27.332158] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.332162] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.332167] Dumping ftrace buffer: [ 27.332171] (ftrace buffer empty) [ 27.332174] Modules linked in: [ 27.332182] CPU: 1 PID: 3345 Comm: syzkaller498576 Not tainted 4.4.111-gf851888 #23 [ 27.332185] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.332190] task: ffff8801ccbe0000 task.stack: ffff8801ccbe8000 [ 27.332206] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.332210] RSP: 0018:ffff8801ccbef9f0 EFLAGS: 00010a07 [ 27.332214] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 27.332217] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.332221] RBP: ffff8801ccbefa00 R08: 0000000000000001 R09: 0000000000000001 [ 27.332224] R10: 0000000000000000 R11: 1ffff1003997df1c R12: 0000000000000004 [ 27.332228] R13: 0000000000000020 R14: ffff8801cc010000 R15: dffffc0000000000 [ 27.332233] FS: 00007f3994292700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.332236] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.332240] CR2: 0000000020dc8000 CR3: 00000001d41c6000 CR4: 0000000000160670 [ 27.332246] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.332249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.332251] Stack: [ 27.332258] ffffffff83776469 ffff8801cc010158 ffff8801ccbefa60 ffffffff825b9ec1 [ 27.332265] ffff8801cc010170 ffffed003980202b ffffed003980202e ffff8801cc010168 [ 27.332272] dead4ead00000000 ffff8801cc010140 0000000000000000 0000000000000000 [ 27.332273] Call Trace: [ 27.332284] [] ? retint_kernel+0x2d/0x2d [ 27.332294] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.332301] [] sg_finish_rem_req+0x2b5/0x340 [ 27.332308] [] sg_new_read.isra.18+0x336/0x3c0 [ 27.332314] [] sg_read+0x8c2/0x1490 [ 27.332324] [] ? __check_object_size+0x154/0x35b [ 27.332330] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.332337] [] ? fsnotify+0xee0/0xee0 [ 27.332347] [] ? avc_policy_seqno+0x9/0x20 [ 27.332355] [] do_loop_readv_writev+0x141/0x1e0 [ 27.332361] [] ? security_file_permission+0x89/0x1e0 [ 27.332368] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.332374] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.332381] [] do_readv_writev+0x5dd/0x6e0 [ 27.332387] [] ? vfs_write+0x530/0x530 [ 27.332392] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.332399] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.332406] [] ? __fget+0x20b/0x3b0 [ 27.332411] [] ? __fget+0x232/0x3b0 [ 27.332416] [] ? __fget+0x47/0x3b0 [ 27.332422] [] vfs_readv+0x78/0xb0 [ 27.332428] [] SyS_readv+0xd9/0x240 [ 27.332433] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.332440] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.332447] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.332536] Code: 96 a4 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 [ 27.332542] RIP [] __free_pages+0x21/0x90 [ 27.332544] RSP [ 27.332550] ---[ end trace 119f9cc827291448 ]--- [ 27.332554] Kernel panic - not syncing: Fatal exception [ 27.334970] Dumping ftrace buffer: [ 27.334971] (ftrace buffer empty) [ 27.334974] Kernel Offset: disabled [ 27.698094] Rebooting in 86400 seconds..