[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.414495] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.047444] random: sshd: uninitialized urandom read (32 bytes read) [ 28.509106] random: sshd: uninitialized urandom read (32 bytes read) [ 29.035542] random: sshd: uninitialized urandom read (32 bytes read) [ 29.176462] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 34.775892] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.854803] BUG: unable to handle kernel paging request at ffffeafff90a0020 [ 34.862225] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.868489] PGD 0 [ 34.870440] [ 34.872071] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.876589] Dumping ftrace buffer: [ 34.880218] (ftrace buffer empty) [ 34.883908] Modules linked in: [ 34.887215] CPU: 0 PID: 3793 Comm: syz-executor354 Not tainted 4.9.122-g54068d6 #26 [ 34.894996] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.904517] task: ffff8801ba6bc800 task.stack: ffff8801d5000000 [ 34.910557] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.919466] RSP: 0018:ffff8801d5007948 EFLAGS: 00010246 [ 34.924897] RAX: dffffc0000000000 RBX: ffffeafff90a0000 RCX: 0000000000000000 [ 34.932242] RDX: 1ffffd5fff214004 RSI: ffffffff814f5918 RDI: ffffeafff90a0000 [ 34.939502] RBP: ffff8801d5007970 R08: 0000000000033ee0 R09: 0000000000000001 [ 34.946976] R10: ffff8801ba6bc800 R11: 0000000000000001 R12: ffff8801d5007c08 [ 34.954227] R13: ffffeafff90a0020 R14: ffffeafff90a0000 R15: 0000000000000001 [ 34.961583] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.969805] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.975677] CR2: ffffeafff90a0020 CR3: 00000001c6d65000 CR4: 00000000001606f0 [ 34.982932] Stack: [ 34.985064] ffffeafff90a0020 ffff8801d5007c08 ffff8801c6d67800 ffffeafff90a0000 [ 34.993274] ffff8801bada28f0 ffff8801d50079c8 ffffffff8154cb8f ffff8801d5007c18 [ 35.001319] ffff8801d5007c10 ffff8801d5007c88 00003ffe428001e0 00000001c6d67000 [ 35.009325] Call Trace: [ 35.011891] [] zap_huge_pmd+0x16f/0x860 [ 35.017506] [] unmap_page_range+0x12ad/0x1730 [ 35.023645] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.029943] [] unmap_single_vma+0x101/0x260 [ 35.035896] [] unmap_vmas+0x102/0x1d0 [ 35.041323] [] exit_mmap+0x214/0x3f0 [ 35.046662] [] ? SyS_munmap+0xa0/0xa0 [ 35.052090] [] ? up_write+0x1a/0x60 [ 35.057351] [] mmput+0xf3/0x2d0 [ 35.062256] [] do_exit+0x906/0x27b0 [ 35.067516] [] ? release_task.part.19+0x1210/0x1210 [ 35.074263] [] ? up_write+0x1a/0x60 [ 35.079527] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.085726] [] ? mprotect_fixup+0x930/0x930 [ 35.091691] [] do_group_exit+0x111/0x340 [ 35.097388] [] ? do_group_exit+0x340/0x340 [ 35.103260] [] SyS_exit_group+0x1d/0x20 [ 35.108909] [] do_syscall_64+0x1a6/0x490 [ 35.114607] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.121558] 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 [ 35.149033] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.155377] RSP [ 35.158975] CR2: ffffeafff90a0020 [ 35.162408] ---[ end trace 51e96edec91cf246 ]--- [ 35.167140] Kernel panic - not syncing: Fatal exception [ 35.172810] Dumping ftrace buffer: [ 35.176332] (ftrace buffer empty) [ 35.180067] Kernel Offset: disabled [ 35.183685] Rebooting in 86400 seconds..