[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.734436] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.851271] random: sshd: uninitialized urandom read (32 bytes read) [ 17.355259] random: sshd: uninitialized urandom read (32 bytes read) [ 17.887482] random: sshd: uninitialized urandom read (32 bytes read) [ 21.326870] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 26.998024] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.082447] BUG: unable to handle kernel paging request at ffffeafff8fb0020 [ 27.089919] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.096174] PGD 0 [ 27.098122] [ 27.099746] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.104316] Dumping ftrace buffer: [ 27.107836] (ftrace buffer empty) [ 27.111522] Modules linked in: [ 27.114822] CPU: 1 PID: 3784 Comm: syz-executor283 Not tainted 4.9.120-gf85543b #24 [ 27.122599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.131935] task: ffff8801bba2c800 task.stack: ffff8801b9f38000 [ 27.137974] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.146665] RSP: 0018:ffff8801b9f3f948 EFLAGS: 00010246 [ 27.152092] RAX: dffffc0000000000 RBX: ffffeafff8fb0000 RCX: 0000000000000000 [ 27.159340] RDX: 1ffffd5fff1f6004 RSI: ffffffff814f5128 RDI: ffffeafff8fb0000 [ 27.166687] RBP: ffff8801b9f3f970 R08: 0000000000034480 R09: 0000000000000001 [ 27.173939] R10: ffff8801bba2c800 R11: 0000000000000001 R12: ffff8801b9f3fc08 [ 27.181194] R13: ffffeafff8fb0020 R14: ffffeafff8fb0000 R15: 0000000000000001 [ 27.188442] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.196774] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.202644] CR2: ffffeafff8fb0020 CR3: 00000001ca9a7000 CR4: 00000000001606f0 [ 27.209898] Stack: [ 27.212027] ffffeafff8fb0020 ffff8801b9f3fc08 ffff8801c9d8e800 ffffeafff8fb0000 [ 27.220126] ffff8801cb2abe70 ffff8801b9f3f9c8 ffffffff8154bfcf ffff8801b9f3fc18 [ 27.228135] ffff8801b9f3fc10 ffff8801b9f3fc88 00003ffe3ec001e0 00000001c9d8e000 [ 27.236159] Call Trace: [ 27.238730] [] zap_huge_pmd+0x16f/0x860 [ 27.244350] [] unmap_page_range+0x12ad/0x1730 [ 27.250487] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.256796] [] unmap_single_vma+0x101/0x260 [ 27.262756] [] unmap_vmas+0x102/0x1d0 [ 27.268194] [] exit_mmap+0x214/0x3f0 [ 27.273546] [] ? SyS_munmap+0xa0/0xa0 [ 27.278997] [] ? up_write+0x1a/0x60 [ 27.284377] [] mmput+0xf3/0x2d0 [ 27.289295] [] do_exit+0x906/0x27b0 [ 27.294557] [] ? release_task.part.19+0x1210/0x1210 [ 27.301209] [] ? up_write+0x1a/0x60 [ 27.306472] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.312601] [] ? mprotect_fixup+0x930/0x930 [ 27.318666] [] do_group_exit+0x111/0x340 [ 27.324373] [] ? do_group_exit+0x340/0x340 [ 27.330258] [] SyS_exit_group+0x1d/0x20 [ 27.335961] [] do_syscall_64+0x1a6/0x490 [ 27.341733] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.348640] 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 [ 27.375817] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.382154] RSP [ 27.385755] CR2: ffffeafff8fb0020 [ 27.389193] ---[ end trace f397234733ee9bbe ]--- [ 27.393928] Kernel panic - not syncing: Fatal exception [ 27.399593] Dumping ftrace buffer: [ 27.403118] (ftrace buffer empty) [ 27.406809] Kernel Offset: disabled [ 27.410418] Rebooting in 86400 seconds..