[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.805963] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.049229] random: sshd: uninitialized urandom read (32 bytes read) [ 18.337719] random: sshd: uninitialized urandom read (32 bytes read) [ 18.863529] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. [ 24.615539] urandom_read: 1 callbacks suppressed [ 24.615543] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.703819] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 24.711318] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.717566] PGD 0 [ 24.719623] [ 24.721246] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.725735] Dumping ftrace buffer: [ 24.729262] (ftrace buffer empty) [ 24.732946] Modules linked in: [ 24.736369] CPU: 1 PID: 3793 Comm: syz-executor211 Not tainted 4.9.122-g54068d6 #26 [ 24.744190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.753526] task: ffff8801b8ac4800 task.stack: ffff8801cb780000 [ 24.759676] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.768491] RSP: 0018:ffff8801cb787948 EFLAGS: 00010246 [ 24.773918] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: 0000000000000000 [ 24.781172] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5918 RDI: ffffeafff9158000 [ 24.788418] RBP: ffff8801cb787970 R08: 0000000000033780 R09: 0000000000000001 [ 24.795665] R10: ffff8801b8ac4800 R11: 0000000000000001 R12: ffff8801cb787c08 [ 24.802912] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 24.810212] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.818419] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.824276] CR2: ffffeafff9158020 CR3: 00000001c83e0000 CR4: 00000000001606f0 [ 24.831521] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.838764] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.846375] Stack: [ 24.848505] ffffeafff9158020 ffff8801cb787c08 ffff8801c83d7800 ffffeafff9158000 [ 24.856503] ffff8801b6ebc318 ffff8801cb7879c8 ffffffff8154cb8f ffff8801cb787c18 [ 24.864517] ffff8801cb787c10 ffff8801cb787c88 00003ffe456001e0 00000001c83d7000 [ 24.872626] Call Trace: [ 24.875213] [] zap_huge_pmd+0x16f/0x860 [ 24.880814] [] unmap_page_range+0x12ad/0x1730 [ 24.886933] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.893227] [] unmap_single_vma+0x101/0x260 [ 24.899177] [] unmap_vmas+0x102/0x1d0 [ 24.904718] [] exit_mmap+0x214/0x3f0 [ 24.910057] [] ? SyS_munmap+0xa0/0xa0 [ 24.915485] [] ? up_write+0x1a/0x60 [ 24.920740] [] mmput+0xf3/0x2d0 [ 24.925762] [] do_exit+0x906/0x27b0 [ 24.931018] [] ? release_task.part.19+0x1210/0x1210 [ 24.937720] [] ? up_write+0x1a/0x60 [ 24.943153] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.949318] [] ? mprotect_fixup+0x930/0x930 [ 24.955267] [] do_group_exit+0x111/0x340 [ 24.960953] [] ? do_group_exit+0x340/0x340 [ 24.966817] [] SyS_exit_group+0x1d/0x20 [ 24.972430] [] do_syscall_64+0x1a6/0x490 [ 24.978120] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.985017] 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 [ 25.011864] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.018195] RSP [ 25.021792] CR2: ffffeafff9158020 [ 25.025221] ---[ end trace 89651491d421ac98 ]--- [ 25.029961] Kernel panic - not syncing: Fatal exception [ 25.035721] Dumping ftrace buffer: [ 25.039245] (ftrace buffer empty) [ 25.042928] Kernel Offset: disabled [ 25.046533] Rebooting in 86400 seconds..