[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.180042] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.765706] random: sshd: uninitialized urandom read (32 bytes read) [ 19.141110] random: sshd: uninitialized urandom read (32 bytes read) [ 19.613078] random: sshd: uninitialized urandom read (32 bytes read) [ 23.028718] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 28.534124] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.610981] BUG: unable to handle kernel paging request at ffffeafff9020020 [ 28.618349] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.624757] PGD 0 [ 28.626705] [ 28.628330] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.632802] Dumping ftrace buffer: [ 28.636431] (ftrace buffer empty) [ 28.640119] Modules linked in: [ 28.643415] CPU: 1 PID: 3762 Comm: syz-executor682 Not tainted 4.9.122-g54068d6 #78 [ 28.651260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.660612] task: ffff8801bd119800 task.stack: ffff8801bbf90000 [ 28.666709] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.675391] RSP: 0018:ffff8801bbf97948 EFLAGS: 00010246 [ 28.680816] RAX: dffffc0000000000 RBX: ffffeafff9020000 RCX: 0000000000000000 [ 28.688063] RDX: 1ffffd5fff204004 RSI: ffffffff814f5918 RDI: ffffeafff9020000 [ 28.695313] RBP: ffff8801bbf97970 R08: 00000000000344e0 R09: 0000000000000001 [ 28.702562] R10: ffff8801bd119800 R11: 0000000000000001 R12: ffff8801bbf97c08 [ 28.709814] R13: ffffeafff9020020 R14: ffffeafff9020000 R15: 0000000000000001 [ 28.717066] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.725367] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.731225] CR2: ffffeafff9020020 CR3: 00000001bd5de000 CR4: 00000000001606f0 [ 28.738476] Stack: [ 28.740604] ffffeafff9020020 ffff8801bbf97c08 ffff8801cb41f800 ffffeafff9020000 [ 28.748605] ffff8801c0a6d840 ffff8801bbf979c8 ffffffff8154cb8f ffff8801bbf97c18 [ 28.756614] ffff8801bbf97c10 ffff8801bbf97c88 00003ffe408001e0 00000001cb41f000 [ 28.764612] Call Trace: [ 28.767192] [] zap_huge_pmd+0x16f/0x860 [ 28.772860] [] unmap_page_range+0x12ad/0x1730 [ 28.778999] [] ? vm_normal_page_pmd+0x310/0x310 [ 28.785411] [] unmap_single_vma+0x101/0x260 [ 28.791364] [] unmap_vmas+0x102/0x1d0 [ 28.796789] [] exit_mmap+0x214/0x3f0 [ 28.802129] [] ? SyS_munmap+0xa0/0xa0 [ 28.807566] [] ? up_write+0x1a/0x60 [ 28.812816] [] mmput+0xf3/0x2d0 [ 28.817730] [] do_exit+0x906/0x27b0 [ 28.822982] [] ? release_task.part.19+0x1210/0x1210 [ 28.829640] [] ? up_write+0x1a/0x60 [ 28.834891] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.841011] [] ? mprotect_fixup+0x930/0x930 [ 28.846963] [] do_group_exit+0x111/0x340 [ 28.852650] [] ? do_group_exit+0x340/0x340 [ 28.858510] [] SyS_exit_group+0x1d/0x20 [ 28.864110] [] do_syscall_64+0x1a6/0x490 [ 28.869818] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.876724] 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 [ 28.903873] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.910211] RSP [ 28.913811] CR2: ffffeafff9020020 [ 28.917238] ---[ end trace 20edbe2a4ce52fa5 ]--- [ 28.921966] Kernel panic - not syncing: Fatal exception [ 28.927623] Dumping ftrace buffer: [ 28.931143] (ftrace buffer empty) [ 28.934825] Kernel Offset: disabled [ 28.938436] Rebooting in 86400 seconds..