random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) divide error: 0000 [#1] SMP KASAN CPU: 1 PID: 4659 Comm: syz-executor828 Not tainted 4.19.0-rc1-next-20180831+ #53 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:div_s64_rem include/linux/math64.h:41 [inline] RIP: 0010:div_s64 include/linux/math64.h:139 [inline] RIP: 0010:__nbd_ioctl drivers/block/nbd.c:1242 [inline] RIP: 0010:nbd_ioctl+0x53c/0xcf0 drivers/block/nbd.c:1303 Code: ea 03 80 3c 02 00 0f 85 1c 07 00 00 48 8b b5 c0 fe ff ff 48 63 8d b8 fe ff ff 48 8b 86 c8 00 00 00 48 8d be c0 00 00 00 48 99 <48> f7 f9 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c RSP: 0018:ffff8801b8c67828 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801cdf9b040 RDI: ffff8801cdf9b100 RBP: ffff8801b8c679a0 R08: ffff8801bda12100 R09: ffffed003a62566d R10: ffff8801b8c67818 R11: ffff8801d312b36f R12: ffff8801d312b280 R13: 00000000ffffffe7 R14: ffff8801d312b360 R15: ffff8801ccc4c900 FS: 0000000000e6b880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e560 CR3: 00000001b9ad5000 CR4: 00000000001406e0 Call Trace: __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9cd/0x2030 block/ioctl.c:601 block_ioctl+0xee/0x130 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443d29 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdfeea6708 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d29 RDX: 0000000000000000 RSI: 000000000000ab01 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 R10: 000000000000000f R11: 0000000000000213 R12: 0000000000401a30 R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace d08523d1fcd6ff07 ]--- RIP: 0010:div_s64_rem include/linux/math64.h:41 [inline] RIP: 0010:div_s64 include/linux/math64.h:139 [inline] RIP: 0010:__nbd_ioctl drivers/block/nbd.c:1242 [inline] RIP: 0010:nbd_ioctl+0x53c/0xcf0 drivers/block/nbd.c:1303 Code: ea 03 80 3c 02 00 0f 85 1c 07 00 00 48 8b b5 c0 fe ff ff 48 63 8d b8 fe ff ff 48 8b 86 c8 00 00 00 48 8d be c0 00 00 00 48 99 <48> f7 f9 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c RSP: 0018:ffff8801b8c67828 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801cdf9b040 RDI: ffff8801cdf9b100 RBP: ffff8801b8c679a0 R08: ffff8801bda12100 R09: ffffed003a62566d R10: ffff8801b8c67818 R11: ffff8801d312b36f R12: ffff8801d312b280 R13: 00000000ffffffe7 R14: ffff8801d312b360 R15: ffff8801ccc4c900 FS: 0000000000e6b880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e560 CR3: 00000001b9ad5000 CR4: 00000000001406e0