[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.462000] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.605311] random: sshd: uninitialized urandom read (32 bytes read) [ 28.227378] random: sshd: uninitialized urandom read (32 bytes read) [ 28.725825] random: sshd: uninitialized urandom read (32 bytes read) [ 28.861534] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 34.387314] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.469180] BUG: unable to handle kernel paging request at ffffeafff9148020 [ 34.476540] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.482795] PGD 0 [ 34.484763] [ 34.486386] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.490960] Dumping ftrace buffer: [ 34.494471] (ftrace buffer empty) [ 34.498161] Modules linked in: [ 34.501446] CPU: 1 PID: 3805 Comm: syz-executor950 Not tainted 4.9.120-gf85543b #24 [ 34.509209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.518540] task: ffff8801b7c54800 task.stack: ffff8801b6b38000 [ 34.524692] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.533400] RSP: 0018:ffff8801b6b3f948 EFLAGS: 00010246 [ 34.538820] RAX: dffffc0000000000 RBX: ffffeafff9148000 RCX: 0000000000000000 [ 34.546065] RDX: 1ffffd5fff229004 RSI: ffffffff814f5128 RDI: ffffeafff9148000 [ 34.553309] RBP: ffff8801b6b3f970 R08: 0000000000034260 R09: 0000000000000001 [ 34.560554] R10: ffff8801b7c54800 R11: 0000000000000001 R12: ffff8801b6b3fc08 [ 34.567810] R13: ffffeafff9148020 R14: ffffeafff9148000 R15: 0000000000000001 [ 34.575156] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.583357] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.589216] CR2: ffffeafff9148020 CR3: 00000001bfe90000 CR4: 00000000001606f0 [ 34.596488] Stack: [ 34.598611] ffffeafff9148020 ffff8801b6b3fc08 ffff8801c74e6800 ffffeafff9148000 [ 34.606600] ffff8801bed609f8 ffff8801b6b3f9c8 ffffffff8154bfcf ffff8801b6b3fc18 [ 34.614641] ffff8801b6b3fc10 ffff8801b6b3fc88 00003ffe452001e0 00000001c74e6000 [ 34.622643] Call Trace: [ 34.625215] [] zap_huge_pmd+0x16f/0x860 [ 34.630845] [] unmap_page_range+0x12ad/0x1730 [ 34.630853] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 34.630861] [] unmap_single_vma+0x101/0x260 [ 34.630872] [] unmap_vmas+0x102/0x1d0 [ 34.630878] [] exit_mmap+0x214/0x3f0 [ 34.630883] [] ? SyS_munmap+0xa0/0xa0 [ 34.630891] [] ? up_write+0x1a/0x60 [ 34.630899] [] mmput+0xf3/0x2d0 [ 34.630907] [] do_exit+0x906/0x27b0 [ 34.630915] [] ? release_task.part.19+0x1210/0x1210 [ 34.630922] [] ? up_write+0x1a/0x60 [ 34.630929] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.630936] [] ? mprotect_fixup+0x930/0x930 [ 34.630944] [] do_group_exit+0x111/0x340 [ 34.630953] [] ? do_group_exit+0x340/0x340 [ 34.630961] [] SyS_exit_group+0x1d/0x20 [ 34.630968] [] do_syscall_64+0x1a6/0x490 [ 34.630977] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.631094] 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 [ 34.631103] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.631105] RSP [ 34.631108] CR2: ffffeafff9148020 [ 34.631116] ---[ end trace dae937d6c9b8c36d ]--- [ 34.631120] Kernel panic - not syncing: Fatal exception [ 34.637311] Dumping ftrace buffer: [ 34.637314] (ftrace buffer empty) [ 34.637316] Kernel Offset: disabled [ 34.788595] Rebooting in 86400 seconds..