[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.194185] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.478029] random: sshd: uninitialized urandom read (32 bytes read) [ 13.631787] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.410003] random: sshd: uninitialized urandom read (32 bytes read) [ 14.539940] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. [ 20.277538] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.395381] BUG: unable to handle kernel paging request at ffffeafff8d48020 [ 20.402738] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.408994] PGD 0 [ 20.410944] [ 20.412569] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.417037] Dumping ftrace buffer: [ 20.420553] (ftrace buffer empty) [ 20.424236] Modules linked in: [ 20.427527] CPU: 1 PID: 3789 Comm: syz-executor619 Not tainted 4.9.122-g54068d6 #26 [ 20.435292] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.444641] task: ffff8801b8ff1800 task.stack: ffff8801b6350000 [ 20.450674] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.459357] RSP: 0018:ffff8801b6357948 EFLAGS: 00010246 [ 20.464783] RAX: dffffc0000000000 RBX: ffffeafff8d48000 RCX: 0000000000000000 [ 20.472035] RDX: 1ffffd5fff1a9004 RSI: ffffffff814f5918 RDI: ffffeafff8d48000 [ 20.479281] RBP: ffff8801b6357970 R08: 0000000000034280 R09: 0000000000000001 [ 20.486530] R10: ffff8801b8ff1800 R11: 0000000000000001 R12: ffff8801b6357c08 [ 20.493774] R13: ffffeafff8d48020 R14: ffffeafff8d48000 R15: 0000000000000001 [ 20.501022] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.509224] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.515080] CR2: ffffeafff8d48020 CR3: 00000001b8347000 CR4: 00000000001606f0 [ 20.522564] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.529811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.537271] Stack: [ 20.539397] ffffeafff8d48020 ffff8801b6357c08 ffff8801bd80b800 ffffeafff8d48000 [ 20.547388] ffff8801b74a3b58 ffff8801b63579c8 ffffffff8154cb8f ffff8801b6357c18 [ 20.555375] ffff8801b6357c10 ffff8801b6357c88 00003ffe352001e0 00000001bd80b000 [ 20.563366] Call Trace: [ 20.565932] [] zap_huge_pmd+0x16f/0x860 [ 20.571534] [] unmap_page_range+0x12ad/0x1730 [ 20.577654] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.583946] [] unmap_single_vma+0x101/0x260 [ 20.589895] [] unmap_vmas+0x102/0x1d0 [ 20.595325] [] exit_mmap+0x214/0x3f0 [ 20.600663] [] ? SyS_munmap+0xa0/0xa0 [ 20.606091] [] ? up_write+0x1a/0x60 [ 20.611345] [] mmput+0xf3/0x2d0 [ 20.616249] [] do_exit+0x906/0x27b0 [ 20.621501] [] ? release_task.part.19+0x1210/0x1210 [ 20.628142] [] ? up_write+0x1a/0x60 [ 20.633394] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.639513] [] ? mprotect_fixup+0x930/0x930 [ 20.645463] [] do_group_exit+0x111/0x340 [ 20.651149] [] ? do_group_exit+0x340/0x340 [ 20.657007] [] SyS_exit_group+0x1d/0x20 [ 20.662607] [] do_syscall_64+0x1a6/0x490 [ 20.668294] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.675193] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 20.702128] RIP [] page_remove_rmap+0x37/0x6d0 [ 20.708461] RSP [ 20.712062] CR2: ffffeafff8d48020 [ 20.715530] ---[ end trace dea54c7d620b6d40 ]--- [ 20.720258] Kernel panic - not syncing: Fatal exception [ 20.726005] Dumping ftrace buffer: [ 20.729521] (ftrace buffer empty) [ 20.733205] Kernel Offset: disabled [ 20.736806] Rebooting in 86400 seconds..