[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.393957] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.304035] random: sshd: uninitialized urandom read (32 bytes read) [ 22.733639] random: sshd: uninitialized urandom read (32 bytes read) [ 23.260046] random: sshd: uninitialized urandom read (32 bytes read) [ 23.395838] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 28.954475] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.032429] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 29.039783] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.046031] PGD 0 [ 29.047978] [ 29.049604] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.054075] Dumping ftrace buffer: [ 29.057588] (ftrace buffer empty) [ 29.061275] Modules linked in: [ 29.064560] CPU: 0 PID: 3796 Comm: syz-executor907 Not tainted 4.9.120-gf85543b #24 [ 29.072324] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.081653] task: ffff8801b914c800 task.stack: ffff8801b6c68000 [ 29.087681] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.096358] RSP: 0018:ffff8801b6c6f948 EFLAGS: 00010246 [ 29.101824] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: 0000000000000000 [ 29.109138] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5128 RDI: ffffeafff9158000 [ 29.116390] RBP: ffff8801b6c6f970 R08: 0000000000033c40 R09: 0000000000000001 [ 29.123635] R10: ffff8801b914c800 R11: 0000000000000001 R12: ffff8801b6c6fc08 [ 29.130883] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 29.138130] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.146331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.152185] CR2: ffffeafff9158020 CR3: 00000001cb7a7000 CR4: 00000000001606f0 [ 29.159429] Stack: [ 29.161552] ffffeafff9158020 ffff8801b6c6fc08 ffff8801cc530800 ffffeafff9158000 [ 29.169605] ffff8801ca67a210 ffff8801b6c6f9c8 ffffffff8154bfcf ffff8801b6c6fc18 [ 29.177644] ffff8801b6c6fc10 ffff8801b6c6fc88 00003ffe456001e0 00000001cc530000 [ 29.185637] Call Trace: [ 29.188203] [] zap_huge_pmd+0x16f/0x860 [ 29.193899] [] unmap_page_range+0x12ad/0x1730 [ 29.200027] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.206329] [] unmap_single_vma+0x101/0x260 [ 29.212281] [] unmap_vmas+0x102/0x1d0 [ 29.217711] [] exit_mmap+0x214/0x3f0 [ 29.223053] [] ? SyS_munmap+0xa0/0xa0 [ 29.228546] [] ? up_write+0x1a/0x60 [ 29.233808] [] mmput+0xf3/0x2d0 [ 29.238778] [] do_exit+0x906/0x27b0 [ 29.244041] [] ? release_task.part.19+0x1210/0x1210 [ 29.250685] [] ? up_write+0x1a/0x60 [ 29.255941] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.262066] [] ? mprotect_fixup+0x930/0x930 [ 29.268016] [] do_group_exit+0x111/0x340 [ 29.273702] [] ? do_group_exit+0x340/0x340 [ 29.279566] [] SyS_exit_group+0x1d/0x20 [ 29.285166] [] do_syscall_64+0x1a6/0x490 [ 29.290866] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.297983] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 29.324859] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.331193] RSP [ 29.334796] CR2: ffffeafff9158020 [ 29.338244] ---[ end trace 319f6c013c2c1d17 ]--- [ 29.342972] Kernel panic - not syncing: Fatal exception [ 29.348624] Dumping ftrace buffer: [ 29.352149] (ftrace buffer empty) [ 29.355832] Kernel Offset: disabled [ 29.359489] Rebooting in 86400 seconds..